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Dissertations / Theses on the topic 'Corrugated structure'
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White, Kevin E. "Numerical Investigations of Corrugated Structural Plate Pipe." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1299527542.
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Vorakunpinij, Adisak. "The effect of paper structure on the deviation between tensile and compressive responses." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/7058.
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Rehberger, Marcus. "Topographical micro-changes in corrugated board production : effects on flexographic post-print quality." Licentiate thesis, Stockholm : Department of Media Technology and Graphic Arts, School of Computer Science and Communication, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4583.
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Keatley, David J. "Three-Dimensional Nonlinear Analysis of Deeply-Buried Corrugated Annular HDPE Pipe with Changes in Its Profile-Wall." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1237230121.
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VYAS, SAURABH. "EXPERIMENTAL CHARACTERIZING OF VORTEX STRUCTURE IN SINUSOIDAL WAVY CHANNEL AND A CASE STUDY FOR FUEL CELL APPLICATIONS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132255225.
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Hosseini, Seyedreza, and Kambiz Jamshidi. "Modulation efficiency enhancement of an optical phase modulator using one dimensional photonic crystal structures." SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A35320.
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Slow light effect based rib silicon waveguide structures are studied in this paper to enhance modulation efficiency of an optoelectronic carrier plasma dispersion effect based phase modulator. Center frequency to achieve desired slow down factor and band width limitations of the structures are investigated through finite element method simulations. Optical modulation efficiency is modeled and the effects of doping, bias voltage and slow light on its performance are studied.
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FERNANDEZ, BARRERO DIEGO. "Dynamic Soil-Structure Interactionof Soil-Steel Composite Bridges : A Frequency Domain Approach Using PML Elements and Model Updating." Thesis, KTH, Bro- och stålbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-256033.
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This master thesis covers the dynamic soil structure interaction of soil-steel culverts applyinga methodology based on the frequency domain response. At the first stage of this masterthesis, field tests were performed on one bridge using controlled excitation. Then, themethodology followed uses previous research, the field tests, finite element models (FEM)and perfectly matched layer (PML) elements.Firstly, a 2D model of the analysed bridge, Hårestorp, was made to compare the frequencyresponse functions (FRF) with the ones obtained from the field tests. Simultaneously, a 3Dmodel of the bridge is created for the following purposes: compare it against the 2D modeland the field tests, and to implement a model updating procedure with the particle swarmalgorithm to calibrate the model parameters. Both models use PML elements, which areverified against previous solution from the literature. The verification concludes that thePML behave correctly except for extreme parameter values.In the course of this master thesis, relatively advanced computation techniques were requiredto ensure the computational feasibility of the problem with the resources available.To do that, a literature review of theoretical aspects of parallel computing was performed, aswell as the practical aspects in Comsol. Then, in collaboration with Comsol Support and thehelp given by PDC at KTH it was possible to reduce the computational time to a feasiblepoint of around two weeks for the model updating of the 3D model.The results are inconclusive, in terms of searching for a perfectly fitting model. Therefore,further research is required to adequately face the problem. Nevertheless, there are some accelerometerswhich show a considerable level of agreement. This thesis concludes to discardthe 2D models due to their incapability of facing the reality correctly, and establishes a modeloptimisation methodology using Comsol in connection with Matlab.
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Norman, Alexander David. "Multistable and morphing corrugated shell structures." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/244988.
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'Compliant' structures, i. e., structures that undergo large deformations as part of their normal behaviour, can perform the function of a complex mechanism with just a single, or very few, components. When multistability is introduced into compliant structures, an even greater simplification can be made, with actuators and/ or locking mechanisms becoming redundant. Corrugated shells are commonly encountered at all scales of engineering, providing shell structures of a dramatically increased stiffness at little extra cost or weight. What is historically less understood is the compliant behaviour of corrugated shells. The topic of this thesis, therefore,' is the development and analysis of new categories of structure incorporating corrugations, utilising their compliancy to achieve morphing behaviours that are not otherwise possible. Three distinct categories of shell are studied: (i) 'flat' corrugated sheets, which are multistable under the action of internal stresses, 'snapping' between their flat state and a cylindrically coiled state: these shells are also capable of developing 'twisted' stable states. An algebraic model based on internal strain energy determines the conditions for the various modes of multistability for uniform changes in curvature throughout the shell, and a plastic flow model describes the formation of the internal stresses; (ii) 'curved' corrugated sheets, 'which can morph between shapes of differing Gaussian curvature without plastic deformation. Again, a simplified algebraic model describes their behaviour, as does a numerical model. These models consider the strong coupling that occurs between bending and stretching in corrugated shells; and (iii) 'doubly-corrugated ' sheets, similar to an eggbox in concept, which , again, can morph between shapes of different Gaussian curvature, and also exhibit synclastic bending behaviour. Some of the analyses performed on the curved corrugated sheets are also applied to these shells. The qualitative behaviour of the analytical models matches, in every detail considered, the behaviour observed in prototypes. Natural-mode analyses on the category (ii) and (iii) shells demonstrate that the interesting behaviour occurs at relatively low stiffnesses, implying that t his behaviour is potentially useful. Quantitatively, however, the analyses for categories (i) and (iii) above do not prove simple to verify. Physical tests compare the internal stresses of the category (i) shells to those predicted by the plastic flow analysis: the predicted stresses exceed those measured by, typically, 50 %, but it is not established whether the discrepancy is due to the simplifications in the model, inaccuracies in the crude test method or a flmv in om understanding. On its prediction of the curvatures created, the model is more successful. A test is more easily devised for the category (ii) shells, and measurements of the shape change are within 4 % of both the finite-element simulations and the simplified algebraic models over 90 % of the test range. In measuring forces, to test the constitutive relations produced; the accuracy is lower, largely due to the difference between our material model and the real properties of the polymer used: there is strong agreement between the finite element model and the algebraic model. In conclusion, this thesis is successful in generating new varieties of structure, which have a a wide potential for application. A broad range of designs and analyses are presented, describing the behaviour of these structures well enough that our understanding of them seems justified. Nonetheless, this work merely scratches the surface of what may be achieved in this field, demonstrating some of the potential of such shells and leaving much to be done in their further evaluation and development.
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Boonkong, T. "Structural behaviour of various corrugated sandwich structures subjected to quasi-static and dynamic loading." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3014270/.
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New designs of sandwich structures for modern high performance shipcraft have been proposed to be used in the Royal Thai Navy ships. Here, novel hybrid sandwich structures based on corrugated reinforced foam cores have been developed by combining various corrugated cores and Fibre Metal Laminates (FMLs) based on aluminium alloy and fibre reinforced composites, to maximise the functionality of the structures. New manufacturing and fabrication techniques have been introduced to improve the integrity of the corrugated core and the skins by achieving a strong bond across the skin-core interface, as well as the fabrication efficiency. The aim of this research work is to investigate the mechanical properties and structural response of the various novel hybrid corrugated sandwich structures under three-point bending, quasi-static and dynamic compression, impact and blast loading. Firstly, tests are conducted to obtain mechanical properties of constituent materials. Then extensive experimental work is undertaken to determine the load-displacement relationships, the failure mechanisms and energy-absorbing characteristics of a large number of corrugated-cores with different cell wall thickness, core configurations and reinforcement, types of foam cores, foam core densities, unit cell sizes, core-layers, core materials and cores with vertical reinforcements. The results reveal relationships of the structural response and types of the failure mode occurred during the tests. The finite element models have then be developed to simulate the response of the corrugated structures tested, which are validated against the corresponding experimental results in terms of deformation and failure modes. The agreement between the numerical predictions and the experimental results is very good across the range of the structures and configurations investigated. Here, the fibre reinforced composites before the onset of damage is modelled as an orthotropic linear elastic material and the damage is modelled using Hashin’s criteria. The aluminium alloys are simulated as an isotropic elastic material before the yield point, followed by strain hardening. The ultimate failure is modelled using the shear failure and ductile failure available in the commercial code Abaqus. Parametric studies are also carried out using the validated numerical models to investigate the structural responses of the corrugated curvilinear aluminium structures subjected to various loading and geometric and material conditions. The dynamic characteristics of the composite sandwich structures through series of experimental tests and numerical predictions investigated in this project can be used in the design of lightweight composite structures for energy-absorbing applications in aerospace, marine and vehicle transportation industries.
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Thill, Christophe. "Corrugated composite structures for morphing wing skin applications." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685422.
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This PhD study developed a composite structure with extreme orthotropic stiffness properties that offers the possibility for use as a skin panel in a morphing trailing edge control surface. The work has shown through an extensive literature review a lack of maturity in existing morphing skin concepts and thus the need for further research and development in this field. The focus of this investigation was on arranging conventional composite materials in a hierarchical structure that allows the combination of inherently different properties such as compliance and stiffness. This resulted in a fibre reinforced composite corrugated sandwich structure that is stiff parallel to the corrugation direction and relatively compliant, in tension and flexure, transverse to the corrugation direction. Experimental, analytical and numerical structural analysis was carried out to define the envelope within which corrugated structures can be designed to meet the requirements of a morphing skin. Further experimental and numerical aerodynamic investigations showed how to best implement these corrugated morphing skins in order to minimise the aerodynamic penalties. The combination of these results led to the design, manufacturing and testing of an aerofoil section with a morphing trailing edge control surface that incorporates a corrugated morphing skin. Low speed wind tunnel tests proved the concept but also highlighted limitations and raised suggestions for future work
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Pang, Wei Chiang. "Corrugated wood composite panels for structural decking /." Available online. Click here, 2005. http://sunshine.lib.mtu.edu/ETD/DISS/2005/Civil&EnvironmentalEng/pangwei/diss.pdf.
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Seo, Haewon. "Mesoscale structural modification for anode-supported solid oxide fuel cell：Effects of corrugated structures fabricated through microextrusion printing." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263653.
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Баязитова, Ю. А., та Yu A. Bayazitova. "Исследование многоэтажных рамных каркасов с двутаврами с гофрированными стенками : магистерская диссертация". Master's thesis, б. и, 2020. http://hdl.handle.net/10995/94605.
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Работа посвящена изучению работы сварных двутавров с гофрированной стенкой в качестве элементов многоэтажных рамных каркасов различного назначения. Проанализированы существующие практические решения таких конструкций, обобщены теоретические подходы и методики расчета изгибаемых и внецентренно-сжатых элементов с гофрированной стенкой. Приведен пример численного расчета многоэтажного рамного каркаса, состоящего из ригелей и колонн с гофрированными стенками. Разработаны узлы крепления элементов каркаса друг к другу и к смежным конструкциям. В рамках исследования установлено, что применение сварных двутавров с гофрированной стенкой позволяет снизить металлоемкость реализации решения как для ригелей, так и для колонн многоэтажных рам зданий без снижения требуемой несущей способности и эксплуатационной надежности конструкции.<br>Present work is devoted to the study of the operation of welded I-sections with a corrugated web as elements of multi-storey frame structures for various purposes. The existing practical solutions for such structures are analyzed, theoretical approaches and methods for calculating of bending and eccentrically compressed elements with a corrugated web are generalized. An example of a numerical calculation of a multi-storey frame structure consisting of girders and columns with corrugated webs is given. The joints for fastening the frame elements to each other and to adjacent structures have been developed. Within the framework of the study, it was found that the use of welded I-sections with a corrugated webs makes it possible to reduce the metal consumption of the solution as for girders and as columns of multi-storey building frames without reducing the required bearing capacity and operational reliability of the structure.
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Dayyani, Iman. "Mechanical behavior of composite corrugated structures for skin of morphing aircraft." Thesis, Swansea University, 2015. https://cronfa.swan.ac.uk/Record/cronfa42865.
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Corrugated panels have gained considerable popularity in a range of engineering applications, particularly in morphing skin applications due to their remarkable anisotropic characteristics. They are stiff to withstand the aerodynamic loads and flexible to enable the morphing deformations. In this thesis a detailed review of the literature on corrugated structures is presented. The specific characteristics of corrugated structures such as: high anisotropic behaviour, high stiffness and good durability, lightness and cost effectiveness are discussed comprehensively. However for the application in morphing aircraft, the optimal design of the corrugated panels requires simple models of these structures to be incorporated into multi-disciplinary system models. Therefore equivalent structural models are required that retain the dependence on the geometric parameters and material properties of the corrugated panels. In this regard, two analytical solutions based on homogenization and super element techniques are presented to calculate the equivalent mechanical properties of the corrugated skin. Different experimental and numerical models are investigated to verify the accuracy and efficiency of the presented equivalent models. The parametric studies of different corrugation shapes demonstrate the suitability of the proposed super element for application in further detailed design investigations. Then the design and multi-objective optimization of an elastomer coated composite corrugated skin for the camber morphing aerofoil is presented. The geometric parameters of the corrugated skin are optimized to minimize the in-plane stiffness and the weight of the skin and to maximize the flexural out-of-plane stiffness of the corrugated skin. A finite element code for thin beam elements is used with the aggregate Newton's method to optimize the geometric parameters of the coated corrugated panel. The advantages of the corrugated skin over the elastomer skin for the camber morphing structure are discussed. Moreover, a finite element simulation of the camber morphing internal structure with the corrugated skin is performed under typical aerodynamic and structural loadings to check the design approach.
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Mat, Rejab Mohd Ruzaimi. "The mechanical properties of novel lightweight structures based on corrugated-cores." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/16173/.
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The aim of this research work is to investigate the mechanical properties of corrugated-core sandwich structures under quasi-static and dynamic loading conditions and to determine the failure mechanisms and energy-absorbing characteristics of the corrugated-cores with different cell wall thickness and filled with a foam core. Triangular corrugation structures were made from an aluminium alloy (AL), a glass fibre reinforced plastic (GFRP) and a carbon fibre reinforced plastic (CFRP). The composite corrugations were fabricated using a hot press moulding technique and then adhesively bonded to skins based on the same material, to produce a range of lightweight sandwich structures. The role of the number of unit cells, the thickness of the cell walls and the width in determining the mechanical behaviour of the structures was investigated. Buckling of the struts was identified as the initial failure mode in these corrugated systems. Continued loading resulted in plastic deformation in the aluminium system, in contrast, fibre fracture, matrix cracking and localised delamination in the composite systems, as well as debonding between the skins and the core were observed in the composites. The compression strength and modulus were shown to be dependent on the number of unit cells and the cell wall thickness, but independent of specimen width. Subsequent mechanical testing was undertaken using an Arcan rig capable of generating a range of loading conditions between pure shear and pure compression. The failure strength in the aluminium system was accurately represented using a two dimensional quadratic failure criterion. In contrast, due to the initation of delamination within the composite struts, the composite corrugated-cores were accurately predicted using a modified failure criterion. Low velocity compression loading was subsequently performed on the sandwich structures, where the dynamic strength enhancement factor was shown to increase for all the corrugation systems. This was attributed to both a material strain-rate sensitivity and inertial stabilisation effects. The failure mechanisms in the sandwich structures were found to be similar under both quasi-static and dynamic loading conditions, where damage initiated due to buckling of the struts. To simulate the mechanical response of the corrugation systems, FE models have been developed using the Abaqus finite element package. The FE results were compared to measured responses, and good agreement was achieved. The failure modes predicted by the FE models show reasonably good agreement with the experimental observations. Finally, foam filling the composite corrugation systems significantly improved the specific strength as well as specific energy-absorbing characteristics of the structures. The compression properties of the corrugated structures have been compared to those of other core materials, where the evidence suggests that these systems compare favourably with other cellular core materials.
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Stalcup, Erik James. "Numerical Modeling of Upward Flame Spread and Burning of Wavy Thin Solids." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1417797653.
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Fahr, Payam. "Response of filled corrugated sandwich structures to shock loading at high temperatures." Thesis, University of Rhode Island, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1555644.
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<p> The dynamic response of filled corrugated steel sandwich panels was investigated under combined extremes of blast loading and high temperature heating. The objective of this project was to study blast mitigation and the thermo-mechanical response of panels using a polymer based syntactic foam and mortar as a filler material. These materials were selected due to their thermal resistivity. In this study, silicone resin (with an operating temperature range between -53°C to 232°C) and two types of glass bubbles were selected as materials to develop a heat resistive syntactic foam. The mechanical properties of the foam were investigated, in ambient temperatures, before and after high-temperature heat treatment (of 500°C), by quasi-static compression experiments. It was observed that plateau stress increases after introduction of glass bubbles in silicone, enhancing the energy absorption properties for both specimens with and without heat treatment. To produce repeatable blast loading, a shock tube was utilized. Pressure history was recorded using pressure transducers located in the shock tube muzzle. High speed photo-optical methods utilizing Digital Image Correlation (DIC) coupled with optical band-pass filters and high-intensity light source, were utilized to obtain the real-time deformation at high temperature while a third camera captured side-view deformation images. The shock pressure profiles and DIC analysis were used to obtain the impulse imparted to the specimen, transient deflection, in plane strain and out-of-plane velocity of the back face sheet. Shock tube experiments were performed to investigate the blast response of corrugated steel sandwich panels filled with a silicone based syntactic foam filler at room and high temperature. It was observed that using the syntactic foam as a filler material, decreased the front face and back face deflections by 42% and 27%, respectively, compared to an empty panel. The highest impulse was imparted on the specimen at room temperature and subsequently lower impulses with increasing temperature. Due to increasing ductility in steel with high temperature, the specimens demonstrated an increase in back face deflection, in-plane strain and out-of-plane velocity with increasing temperatures with weld failure being the primary form of core damage. High temperature blast experiments were also performed on mortar filled corrugated steel sandwich panels. Mortar is a common building material that can withstand extreme temperatures. It was observed cement based mortars are thermally resilient enough to be used as a filler material for high temperature applications. The highest impulse was imparted on the specimen at room temperature and subsequently lower impulses with increasing temperature. A temperature difference of at least 300ºC was observed across the thickness of the specimen for all heating conditions. Due to increasing ductility in steel with high temperature, the specimens demonstrated an increase in back face deflection, in-plane strain and out-of-plane velocity with increasing temperatures with weld failure being the primary form of core damage.</p>
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Chess, Jacob Dillon. "Effect of Aerogel on the Thermal Performance of Corrugated Composite Sandwich Structures." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1962.
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Current insulation solutions across multiple industries, especially the commercial sector, can be bulky and ineffective when considering their volume. Aerogels are excellent insulators, exhibiting low thermal conductivities and low densities with a porosity of around 95%. Such characteristics make aerogels effective in decreasing conductive heat transfer within a solid. These requirements are crucial for aerospace and spaceflight applications, where sensitive components exist among extreme temperature environments. When implemented into insulation applications, aerogel can perform better than existing technology while using less material, which limits the amount of volume allocated for insulation. The application of these materials into composites can result in enhancing a material's thermal and mechanical properties when exposed to mechanical testing.
The main objective of this study was to perform theoretical and experimental analysis on a corrugated composite sandwich structure integrated with aerogel insulation by studying its effective thermal conductivity. The aerogel material used was Pyrogel XT-E, a silica aerogel-based fiberglass insulation manufactured by Aspen Aerogels. Theoretical models of the corrugated composite sandwich structure were constructed in ANSYS Workbench based on geometry from a previous study. The main goal of the theoretical models was to analytically and computationally study the effective thermal conductivity of this sample; the conditions of these simulations were modeled after the experimental setup. Additionally, two insulation studies were performed using the thermal models. The first study was performed on a flat plate structure to determine the optimal thickness of Pyrogel XT-E in a flat plate orientation. The second study compared multiple types of common insulation materials to Pyrogel XT-E when integrated into the corrugated composite sandwich structure model. As expected, aerogel particles and Pyrogel XT-E outperformed all insulation materials and had the lowest effective thermal conductivity. Experimental data was obtained using a test enclosure and a heating element source with an integrated temperature control circuit that was designed and built for this study. This experimental data was compared to the theoretical data obtained from the thermal model simulations. The corrugated composite sandwich structure did not perform as well as expected due to thermal bridging along the composite corrugation. Its effective thermal conductivity was much higher than that of the flat plate structure, even though the effective Pyrogel XT-E layer in the corrugated composite sandwich structure was more than twice as thick as the layer in the flat plate structure. Despite thermal bridging, the corrugated composite sandwich structure exhibits superb thermal resistance, which adds to its impressive strength. Thermal conductivity results from this study can be used to design efficient materials for high structural and thermal stress applications.
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Massaglia, J. F. "Modelling the sound insulation of corrugated roof structures : an extended transfer matrix approach." Thesis, University of Salford, 2017. http://usir.salford.ac.uk/43778/.
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Over the course of this work, the transfer matrix method (TMM) was implemented and studied for its potential in predicting the sound insulation characteristics of corrugated dual leaf roof structures. A model of periodically connected plates, using Fourier expansions, was derived independently and extended in this work to include the stiffness of connectors and orthotropic plates, and intermediate beams in the framework of the structure. The same principles were applied in deriving the transmission loss through periodically stiffened plates, as a proxy for corrugated panels. At the same time, corrugated plates were modelled as equivalent orthotropic panels, a process which is compatible with the TMM without particular modifications. Infill materials were modelled using simple fluid representations and more complex poroelastic behaviour. The point-connected plate models were combined with the TMM to enable multiple layers of infill materials between the two plates, by using an effective fluid approach. The stiffness of typical roof connectors was obtained with numerical simulations, and used in predicting transmission loss. Corrections were introduced to simulate diffuse laboratory conditions and enable meaningful comparisons to available data. The limitations of a simple orthotropic plate model compared to laboratory measurements and the ribbed plate model were identified. A number of measurements of dual leaf partitions and full roof systems were compared to the TMM and point-connected plate models, finding typically good agreement at low to mid-frequency, and a strong dependence of high frequency transmission loss on connector stiffness.
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Fekrat, Abdul Qaium. "Structural Benefits of Concrete Paving of Deteriorated Metal Culvert Inverts." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541975540368335.
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Duong, Pham Tuong Minh. "Modélisation numérique du comportement dynamique de structures d'emballages complexes par méthodes d’homogénéisation." Thesis, Reims, 2012. http://www.theses.fr/2012REIMS025.
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Les palettes sont très largement utilisées pour le transport, le stockage et la manutention de marchandises. Une palette chargée de bouteilles d'eau (emballage tertiaire) est constituée : d'une palette en bois, des packs (emballages secondaires) contenant un ensemble de 6 bouteilles d'eau (emballages primaires) enveloppés par un film plastique, des intercalaires en carton ondulé, et d'une housse plastique rétractable ou étirable pour le maintien et la protection de la marchandise palettisée. L'objectif général de cette thèse est de modéliser et de simuler le comportement statique et dynamique d'une palette durant le transport routier à l'aide du logiciel Abaqus. La simulation détaillée des bouteilles, des packs et des intercalaires constituants la palette est très fastidieuse et complexe à mettre en œuvre. Nous proposons de réaliser l'homogénéisation sur les packs et les intercalaires pour diminuer largement le temps de préparation des géométries et des maillages, ainsi que le temps CPU. Un modèle d'homogénéisation de l'intercalaire en carton ondulé est proposé. Il consiste à calculer les rigidités globales pour une plaque homogène équivalente. Ce modèle d'homogénéisation analytique permet de calculer rapidement et correctement ces rigidités globales et leurs couplages. Le comportement suivant l'épaisseur de l'intercalaire a beaucoup d'influence sur le glissement des packs. Nous avons donc développé un modèle solide en trois couches pour prendre compte le comportement élasto-plastique suivant l'épaisseur. Le pack de 6 bouteilles d'eau a été homogénéisé en caractérisant son comportement global par des essais expérimentaux et des simulations par la méthode des éléments finis. Le remplacement des packs par des solides homogènes de forme simplifiée permet de diminuer largement le nombre d'éléments et d'éviter le traitement du contact bouteille-bouteille et bouteille-film. De nombreux essais expérimentaux et simulations numériques avec nos modèles d'homogénéisation ont été réalisés pour étudier le comportement statique et dynamique de palettes chargées de bouteilles d'eau. Les résultats obtenus par les essais expérimentaux et les simulations numériques sont comparés pour valider nos modèles d'homogénéisation<br>Pallet systems are widely used for the transport, storage, stacking and handling of goods. A pallet charged with bottles of water (tertiary packaging) is composed of: a wooden pallet, packs (secondary packaging) containing a set of 6 bottles of water (primary packaging) wrapped with a plastic film, the cardboard sheet insert, and a plastic film for the maintenance and protection of the palletized goods. The aim of this thesis is to model and to simulate the static and dynamic behaviors of a charged pallet during the transport using the Abaqus software. The detailed simulation of the bottles, the packs and the cardboard sheet inserts constituting the pallet is very tedious and complex. We propose to homogenize the packs and cardboard inserts to largely reduce the time for the preparation of geometries and meshes, as well as the CPU time. A homogenization model for the cardboard inserts is proposed. It consists in calculating the global stiffness of the equivalent homogeneous plate. This analytical homogenization model allows calculating these global rigidities and their couplings quickly and correctly. The behavior in the thickness direction of the cardboard has a great influence on the sliding of the packs. We have developed a three layers solid model to take into account the elasto-plastic behavior through the thickness. The pack of 6 bottles of water is homogenized by characterizing its global behavior by experimental measurements and simulations with the finite element method. Replacing the packs by a simplified homogeneous solid permit to greatly reduce the number of elements and avoid the contact treatment between bottle-bottle and bottle-film. Many experimental tests and numerical simulations using our homogenization models have been achieved to study the static and dynamic behaviors of pallets. The results obtained by experimental tests and numerical simulations are compared to validate our homogenization models
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Subramanian, Kumar. "Analysis of homogeneous film flows on inclined surfaces and on corrugated sheet of packing using CFD." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2015. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-164588.
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The key to success in separation of liquid mixtures is the efficient creation and utilization of vapour-liquid contact area. By packing the column with gas-liquid contact devices such as structured packing, the vapour-liquid contact area can be increased. However, the efficiency of these packed columns depends strongly on the local flow behaviour of the liquid and vapour phase inside the packing.
The aim of this work was to develop three-dimensional CFD models to study the hydrodynamic behaviour on the corrugated sheets of packing. Different approaches are possible to simplify the problem and to extend it for more complex flow scenarios. In this work, three-dimensional CFD simulations were performed to study the complete fluid-dynamic behaviour. This was performed in two steps.
As a first step, the developed model was validated with experimental studies using a simplified geometry i.e., an inclined plate. The three-dimensional Volume-of-Fluid (VOF) model was utilized to study the flow behaviour of the gas-liquid countercurrent flow. The influence of the liquid surface tension was taken into consideration using the Continuum Surface Force (CSF) model. The wetting characteristics of liquids with different viscosity (1 and 5 mPas) and contact angle (70° and 7°) were studied for different flow rates. Three different mixtures (water, water-glycerol (45 wt. %) and silicon-oil (DC5)) were considered. Initially, the rivulet width of experiments and simulations were compared and an error of 5 % maximum was determined. The results were also in good agreement with earlier studies. The percentage of wetting due to changes in flow rate, viscosity and contact angle was compared and discussed. For all tested systems, excellent agreement between the experiments and simulation studies was found. In addition, profiles of the velocity in the film at film flow conditions over a smooth inclined plate obtained from simulations were compared with experimental profiles obtained using a μPIV technique. A detailed sensitivity study was also performed in order to understand the changes in the velocity profiles due to small change in liquid flow rate, temperature and inclination angle.
As a next step, the developed model was extended to geometries resembling real corrugated sheets of packing used in industrial applications. In earlier numerical studies of structured packing, geometries were simplified to enable easy meshing and faster computation. In this work, the geometries of corrugated sheets of packing were developed without any simplification and the flow behaviour was studied using the model validated in the first step. The flow behaviour on sheets with different geometrical modifications such as smooth and triangular crimp surfaces as well as perforations on the sheets were numerically studied and quantitatively compared with experimental studies for the three different fluid test systems. The agreement between the simulations and experiments was within an acceptable range for all system. The difference in the interfacial area between the corrugated sheets of a packing with and without perforation was analyzed and the prediction ability of different empirical correlations for the interfacial area available in literature was also compared and discussed.
Furthermore, the numerical study was extended to understand the influence of the second corrugated sheet. Studying the flow behaviour between two sheets experimentally is very challenging, especially inside opaque packing. The model proved to be a very suitable tool to study the hold-up of the liquid between two sheets, the change in wetting behaviour due to small change in liquid inlet position. The results are also in good agreement with the earlier experimental studies, where researchers measured the liquid hold-up mainly in the region where two corrugated sheets touch each other.
The three-dimensional CFD model was validated to study the flow behaviour on corrugated sheets of packing. The results from the simulations agree very well with findings from the experimental studies in terms of wetting and hold-up.
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Novotny, Ondrej. "Stabilisation of Steel Structures by Diaphragm Action of Trapezoidal Sheeting." Thesis, KTH, Bro- och stålbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-273971.
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The main idea behind stabilisation by diaphragm action is to create a deep beam thatcan resist horizontal loads acting on a structure. It is achieved by connecting the sheetingto the primary structure of the roof so that the edge beams resist the bending momentthrough normal stresses and the sheeting resists the shear force through shear stresses.An essential assumption of a functional diaphragm system is a sufficient connectionbetween the sheeting and the primary structure.In this thesis, the global behaviour of a diaphragm, as well as possible failure modesof sheeting of different thicknesses, are investigated.A laboratory experiment is conducted in the first part of the thesis. In the experiment,two types of self-drilling screws in combination with three different plate thicknesses aretested in shear. Slip flexibility of the screws is evaluated based on the experiment andcompared to flexibilities according to European Recommendations for the Application ofMetal Sheeting Acting as a Diaphragm.In the second part of the thesis, a finite element simulation is performed on two structuresto investigate the global behaviour of the diaphragm. The experimental results are,additionally, implemented into the finite element model.In the last part, hand calculations are performed based on analytical formulas given inEuropean Recommendations for the Application of Metal Sheeting Acting as a Diaphragmand the maximum horizontal displacement of the structure is compared to the FEAresults.
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Seereeram, Videsh Ramjas. "Compliant shell mechanisms." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610867.
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Lan, Xing. "Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011859/.
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This thesis presents experiments and numerical analysis of a novel cold-formed steel framed shear wall sheathed with corrugated steel sheets. The objective of this newly designed shear wall is to meet the growing demand of mid-rise buildings and the combustibility requirement in the International Building Code. The strength of the novel shear wall is higher than currently code certified shear wall in AISI S400-15 so that it could be more favorable for mid-rise building in areas that are prone to earthquakes and hurricanes. Full-scale monotonic and cyclic tests were conducted on bearing walls and shear walls under combined lateral and gravity loads. Though the gravity loads had negative effects on the strength and stiffness of the shear wall due to the buckling of the chord framing members, it still shows promise to be used in mid-rise buildings. The objective of numerical analysis is to quantify the seismic performance factors of the newly design shear wall lateral-force resisting system by using the recommended methodology in FEMA P695. Two groups of building archetypes, story varied from two to five, were simulated in OpenSees program. Nonlinear static and dynamic analysis were performed in both horizontal directions of each building archetype. Finally, the results of the performance evaluation verified the seismic performance factors(R=Cd=6.5 and Ω =3.0) were appropriate for the novel shear wall system.
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García, Castelló Javier. "A Novel Approach to Label-Free Biosensors Based on Photonic Bandgap Structures." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/35398.
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The necessity of using extremely high sensitivity biosensors in certain research areas has remarkably increased during the last two decades. Optical structures, where light is used to transduce biochemical interactions into optical signals, are a very interesting approach for the development of this type of biosensors. Within optical sensors, photonic integrated architectures are probably the most promising platform to develop novel lab-on-a-chip devices. Such planar structures exhibit an extremely high sensitivity, a significantly reduced footprint and a high multiplexing potential for sensing applications. Furthermore, their compatibility with CMOS processes and materials, such as silicon, opens the route to mass production, thus reducing drastically the cost of the final devices. Optical sensors achieve their specificity and label-free operation by means of a proper chemical functionalization of their surfaces. The selective attachment of the receptors allows the detection of the target analytes within a complex matrix.
This PhD Thesis is focused on the development of label-free photonic integrated sensors in which the detection is based on the interaction of the target analytes with the evanescent field that travels along the structures. Herein, we studied several photonic structures for sensing purposes, such as photonic crystals and ring resonators. Photonic crystals, where their periodicity provokes the appearance of multiple back and forth reflections, exhibits the so-called slow-light phenomenon that allows an increase of the interaction between the light and the target matter. On the other hand, the circulating nature of the resonant modes in a ring resonator offers a multiple interaction with the matter near the structure, providing a longer effective length.
We have also proposed a novel approach for the interrogation of photonic bandgap sensing structures where simply the output power needs to measured, contrary to current approaches based on the spectral interrogation of the photonic structures. This novel technique consists on measuring the overlap between a broadband source and the band edge from a SOI-based corrugated waveguide, so that we can determine indirectly its spectral position in real-time. Since there is no need to employ tunable equipment, we obtain a lighter, simpler and a cost-effective platform, as well as a real-time observation of the molecular interactions. The experimental demonstration with antibody detection measurements has shown the potential of this technique for sensing purposes<br>García Castelló, J. (2014). A Novel Approach to Label-Free Biosensors Based on Photonic Bandgap Structures [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/35398<br>TESIS
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Derrick, Nathan Lynn. "Shear and Bending Strength of Cold-Formed Steel Solid Wall Panels Using Corrugated Steel Sheets for Mobile Shelters." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062814/.
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The objective of this thesis is to determine if the single sided resistance spot weld (RSW) can be used as a feasible connection method for cold formed steel (CFS) shear walls subject to lateral force of either seismic or wind loads on mobile shelters. The research consisted of three phases which include: a design as a 3D BIM model, connection tests of the resistance spot weld, and full-scale testing of the designed solid wall panels. The shear wall testing was conducted on specimens with both resistance spot weld and self-drilling screws and the results from tests gave a direct comparison of these connections when the solid wall panel was subjected to in-plane shear forces. The full-scale tests also included 4-point bending tests which was designed to investigate the wall panel's resistance to the lateral loads applied perpendicularly to the surface. The research discovered that the singled sided resistance spot weld achieved similar performance as the self-drilling screws in the applications of CFS wall panels for mobile shelters. The proposed single sided resistance spot weld has advantages of low cost, no added weight, fast fabrication, and it is a feasible connection method for CFS wall panels.
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Mellat, Peyman. "Dynamic analysis of soil-steel composite bridges for high speed railway traffic : Case study of a bridge in Märsta, using field measurements and FE-analysis." Thesis, KTH, Bro- och stålbyggnad, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-125342.
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Soil-steel composite bridge refers to structures where a buried flexible corrugated steel pipe works in composite action with the surrounding soil. These structures are being increasingly used in road and railway projects as an alternative to standard type bridges, e.g. short- and medium span concrete beam- and portal frame bridges. On account of their economic advantage and short and easy construction operation, soil-steel composite bridges are getting more popular as railway crossings located far from the cities at the heart of the nature. In this research, the dynamic behaviour of soil-steel composite bridges under high-speed train passages is studied. The studied case is a short span soil-steel composite railway bridge located in Märsta close to Stockholm. The behaviour of the bridge is first observed through field measurements in terms of deflections, stresses, and accelerations at several locations on the bridge. The measured responses are then analysed in order to predict the properties of the soil and steel material working in composite action. Subsequently, 2D and 3D finite element models are developed in order to simulate the behaviour of the bridge. The models are calibrated using the field measurements through several parametric studies. The 3D-model also enables estimation of the load distribution, which is found to increase at higher train speeds. An effective width to be used in 2D analyses is proposed. Finally, the response of the bridge is studied under high-speed train models according to Eurocode.
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Tzeng, Huan-Jie, and 曾煥杰. "Furniture Structure design and Application of Corrugated Paper." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/b56n77.
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碩士<br>國立臺北科技大學<br>創新設計研究所<br>99<br>Furniture is a combination of practical and design of industrial products is one integral part of the apparatus of human life. In recent years, under the influence of the global greenhouse effect, caused by product manufacturers, designers and consumer users for environmental protection and sustainable development issues such as environment of fundamental importance, the rise of the consumer market an environmentally friendly furniture, consumer trends. Therefore, the study of environmental protection to be applied to furniture, corrugated materials and design of the structure, the main purpose: To analyze the structure of paper designed for daily use and integration of media means; structure commonly used in furniture and furniture commonly used development and design of corrugated structure; of the same structure to link different pieces of flute, whether the difference in strength; and apply the structure of corrugated furniture design example.
First, the paper by analyzing the contents of the patent life of products, articles for daily paper summarized the design of the structure and binding mode of media, and the binding mode corrugated structure, and through brainstorming and focus groups to develop corrugated furniture Plane frame structure commonly used L-type structure, T-type structure, cross-shaped structure; three-dimensional frame structure 3D-L-type structure, 3D-T-type structure, 3D-cross-shaped structure; and link pieces of a total of seven components. Developed by the flat structure of three-dimensional structure of different composition, the average consumer self-assembled DIY, furniture needs change according to different sizes, modular design can be reached, packaging sheets of light weight and can be disassembled and weight and other characteristics. And experimental research method to link pieces of corrugated structural bending strength test, and obtained the vertical flute pieces to the link with the link bending strength than the level of flute pieces to the link and link the results of cases, the final results of the simulation of the above and commercial space in the home situation, the case of modular application design model, as a reference for future design of corrugated cardboard furniture.
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Chia-Lin, Chang, and 張家林. "Molecular dynamics simulation of thin film growth on GMR corrugated structure." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/86066480526561484853.
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碩士<br>國立成功大學<br>機械工程學系<br>89<br>This paper presents the use of molecular dynamics in simulating thin film growth on GMR corrugated structures. The simulation model mainly concerns the deposition of Co atoms on a V-shape Cu substrate. The many-body, tight-binding potential model is utilized in the MD simulation to represent the inter-atomic force which exists between the atoms. The interface width is used to quantify the variation of surface roughness at the transient and steady states. The paper investigates the influence of incident energy on the deposited film surface property and on the growing mechanism, for both vertical and oblique deposition. The results demonstrate how the growing characteristics are influenced by different incident energies and by different deposition directions. It is found that at relatively low incident energies the film growth tends to be in a 3-D cluster mode and that a void track is formed, whose growing direction is almost equal to the surface normal to the two inclined surfaces. The uneven thickness found along the base of the V-shape is mainly due to the deposited atoms which accumulate at the bottom of the V-groove when the incident energy is at a relatively high level. It is found that there exists an optimal incident energy which produces the best film surface property. The film surface property can be improved by changing the incident direction relative to two inclined directions of . Smaller deviation angles yield better film surface properties for low incident energy. Conversely, higher levels of incident energy result in worse film surface properties.
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Chang, Shou-You, and 張守玉. "The Application of Reinforced Box Structure on Corrugated Paperboard Furniture Design." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/m7e22q.
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碩士<br>國立臺北科技大學<br>創新設計研究所<br>98<br>Because the green design requested, gradually, the changes of the contemporary designer's concepts and methods form with new fasion and the tendency. During same time, these were reflected humanity and were reconsidered as damaging the enviroment. Therefore the research comes up with a new concept of furniture design. By consideration of the material quality and the protecting the environment, the product needs to be recycled by high aluminum extrusion that makes the product stronger and is mutually matched.
Using as a furniture product, the corrugated paper is considered to be the pratical material which becomes more and more popular to home situation. The product may use as either a piece of decoration or furniture. Most parts of corrugated paper’s product can be structured by piling and constructing each part which achieve the stable effect. Therefore the product can increase with the paper stability. However, this research’s attempt increases the structural design of using the reinforced boxes to support and the slab’s intensity. The table’s legs are easily to be structured or reconstructed. This fact is not only achieved the structure’s stablility but also is decreased the quantity of using Aluminum extrusion.
The design’s developing process by the viewing of convienience is demanded after the research which penetrating with the product’s pratical utility. It includes: (1) According to literature, people know that the past furnitures are not either covienient or easy carring from one to another place, and hard to contructed and reconstructed. (2) Corrugated paper’s furnitures and other types of these were analyized by taking the reference of design. (3) Based on the structure, the slab of Reinforced Box, these develop different type of slab’s uses which can be applied on.
Using the slab and the table foot structural design characteristic, the products were merited: (1) the table board and the table legs are easy to be constructed and reconstructed without tools. (2) When one buys the product, not only it can be easy carring around but being easy to DIY. (3) The slab and different parts of structures are not huge, and its area is 1047×736 (mm). Each two pieces of slips are 647×736 (mm), and the total thickness by joining them together is 12 (mm). So that the product does not take much space while storing in the storeage. (4) While discarding the product and it is also easy to decompose and the recycling. (5) The product is easy to constructed and reconstructed; so that, therefore it is convenience to moving it form one place to another place. (6) The slab and the table legs structural design may also apply on other different furnitures.
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Hsu, Chih Lung, and 徐誌隆. "Study on Structure Behavior of Prestressed Girder with Corrugated Steel Web." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/byx8a2.
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碩士<br>國立臺北科技大學<br>土木與防災研究所<br>96<br>Prestressed girder with corrugated steel web is a new type of structure. In which, the corrugated steel web is employed to replace web of the traditional concrete box girder. Therefore, it can reduce the use of concrete as well as self-weight effectively, and increase shear strength of the web. The “accordion effect” of corrugated steel web is a special structure behavior that allows axial telescopic of displacement with girder, accordingly, the corrugated steel web doesn’t take axial force and flexural bending so that the prestress can be efficiently introduced into the concrete flange. The use of corrugated steel web has many advantages such as light girder, economy cost, artistic appearance, high shear strength and rapid construction. The application of it to practical bridge engineering becomes popular in last decade, the study on its structure behavior is thus important.
In this study, the famous finite element software of ANSYS v11.0 was used for simulation and analysis on structure behavior of corrugated steel web. Effects of geometric and material nonlinear were taken into account. The reported experimental results of steel and concrete I-girders with corrugated steel web were served as case studies. The results of analysis were compared with those of experiment. It shows that the analysis is consistent to the actural behavior within acceptable precision. The results obtained might benefit the design of this type girder in the future.
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BARTOLOZZI, GIORGIO. "Modelling of corrugated core sandwich panels in multidisciplinary optimization processes." Doctoral thesis, 2014. http://hdl.handle.net/2158/914950.
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Metal sandwich panels are becoming increasingly important as multi-functional components in many industrial areas. One of the main characteristics is their high stiffness-to-mass ratio, especially under bending conditions. This property strongly depends on the two faces, but other properties – acoustic, thermal, etc. – are governed by the core. Therefore, R&D in innovative cores is justified by the effort the industry is making to create multi-functional components that integrate good performances in different fields. The multi-functionality of components can be efficiently achieved by using multidisciplinary optimization (MDO) processes. Nevertheless, given their iterative nature, quick but accurate simulations are needed to define component characteristics.
In this context, the PhD activity reported in this dissertation aims at developing modelling techniques, even simplified, which allow determining the static and dynamic properties of all-metal corrugated core sandwich panels to include them in optimization processes. To begin with, an analytical formulation to represent a general corrugated core as an equivalent homogeneous layer is presented. The main limitations of already developed formulations are overcome by the proposed methodology. Moreover, given the absence in the literature of accurate formulations for sinusoidal cores, the general one is simplified to adapt it to that specific
geometry.
Nevertheless, it is shown that, due to manufacturing processes, the real shape of the corrugation is different from the supposed sinusoidal shape. A measurement campaign – tensile testing and modal analysis – is performed to validate the analytical formulation and to prove the importance of modelling the real shape of the
corrugation, especially for the modal analysis.
Finally, to show the industrial advantages of using the proposed modelling technique, a case study was investigated. An optimization process is set up on sinusoidal corrugated sandwich panels with both static and acoustic constraints applied, which would not be possible without the computational time reduction achieved by the analytical equivalent modelling proposed.
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FAN, Jia-Jhen, and 范嘉振. "On the Study of Structure Design of Board Display with Corrugated Paper." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60843309338250918262.
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CHIAO, WENG NENG, and 翁能嬌. "An apply model of the corrugated paperboard cushion structure in packaging design concern of the computer peripherals." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/87524816841218375850.
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碩士<br>國立臺灣科技大學<br>設計研究所<br>91<br>ABSTRACT
The use of corrugated paperboard as a cushion structure packaging material is the trend in the entire international packaging industry’s development. Also, in industrial transportation packaging, the role of corrugated paperboard cushion structure in packaging design is becoming more and more important.
Since 1990, Germany has been promoting a green environment policy and a package recycling movement. The global export of product packaging is increasingly drawing attention to the research on corrugated paperboard cushion structure packaging design.
However, the question remains on how to use corrugated paperboard folding and design as three dimensional packaging, while making the packaging structure fulfill the functions of protection, stability, cushioning, less materials, low-cost, and easy assembly. All of these techniques are very difficult for new designers to learn without guidance.
Corrugated paperboard applications in package cushioning structure design has a long history.
The Tatung Company has had experience in electric fan packaging design since 1961. However, the traditional method of transmitting knowledge in design has been until now, the senior designer teaching the new designer how to work with the material. They have not completed documents or reference models or data. Therefore, many designers don’t know how to use corrugated paperboard to achieve the best cushion structure packaging.
The development trends in science and technology programs, has been on computer and peripheral products. We can see the development direction of products emphasizing function -- the main factors in design are light, thin, short, and small. Enhancing function, researching and discovering useful design models for the professional designer, making design reference materials available for the education of packaging designers lets be able to achieve the best packaging design with regard to structure, uniform materials, and minimum packaging, with the ultimate goal, being to offer protection to the products.
Creating and establishing a design model is not easy. This requires research with document discussions, market surveys, sample collections and more. This information can be integrated to create an interview questionnaire.
Therefore, it is crucial to learn from professional designer’s past experience. The first step of research should include structured interviews with 10 designers gain the value of their experience. The second step of research should be semi-structured interviews with three design managers. To get first hand information, we examined statistics, analysis, and compare, and integrate their knowledge of the use of corrugated paperboard packaging cushioning structure. Design process, design method, and practical suggestions regarding application models for corrugated paperboard packaging cushioning structure design will be included as well. The conclusions were integrated as follows:
1. The research were depend on the document and market research analysis:
An application model of the packaging structures included seventh criteria: structure for stability, structure for cushioning, structure for combining stability and cushioning, structure for dividers or partitions, structure for joints, outer packaging carton, and other materials. All of these categories have particular functions.
2. These results were based on the structured interview and survey:
（1） When product weight wads much heavier than 「Cushioning space（unit mm）」, 「The flutes or corrugations of corrugated paperboard of the inner cushioning structure」,「Face corrugated basic weight measurement G-data and bursting」,「Basic weight measurement G- data of the flutes paper and bursting」,「Flutes direction of outer packaging corrugated paperboard」data follow them upgrade.
（2）The weight, style, attribute, function, damage of products will influence the complete structure design. The structure unit and cushioning packaging will require more materials. On the other hand, this also influences the packaging workers as their process becomes more complicated.
3. These results were based on the semi-structured interview and survey:
（1）The use of corrugated paperboard as the packaging cushion structure design material is the trend with regards to the international environment protection issue.
（2）With regards the packaging design process, it is necessary to understand the customer’s needs before the design process.
Also, there is a need to understand the weight, style, qualities, special items and weakness points of the products. From idea development to mass production, there are about ten to thirteen steps. Computer software and design equipment quality is a reason to reduce the timetable and influence the design process.
（3）The goal of packaging design:
Keep the cost down for container cargo, reduce the packaging material, keep the structure simple, and also, drop tests, vibration tests, and other temperature, and transportation related environment tests. All of these are importance considerations.
（4）Design creation and development methods:
National and international packaging displays many successful examples in packaging innovation and new style type patents. Awards for design in packaging, and brainstorming meetings, are the easiest and best methods for improving corrugated paperboard cushion structure packaging design.
（5）The executive methods for model making:
After idea development, try to hand-make a model, or use the cutting machine, and then test the packaging container. Finish the final three-dimensional drawing, for associate factory to finish the packaging samples, and test them. That is the basic method of the model making process.
（6）Design and evaluation:
Check and evaluate the materials, the materials bursting test data have to match the outer packaging box or the cushion structure inner partitions or dividers bursting test data.
（7）Apply development after packaging design:
Re-design the successful packaging design case, or consider, when mass production of the relative packaging system, the use the same die-cast machine module. It is good for keeping costs down.
Key words: packaging design, cushioning packaging，corrugated paperboard, structural cushioning, cushioning structure design
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Haggag, Atef Ameen. "Structural backfill design for corrugated-metal buried structures." 1989. https://scholarworks.umass.edu/dissertations/AAI9001508.
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The aim of this study is to provide a design method for the structural backfill envelope surrounding corrugated-metal buried conduits that will consider the behavior of the surrounding soil as well as the structure's properties. The requirements of the structural backfill envelope are discussed. Previous design practice is reviewed and its deficiencies are pointed out. The need for an appropriate design method for the structural backfill envelope is shown. Soil models for finite element analysis of soil-conduit systems are presented. Soil parameters for these models are evaluated to investigate their suitability. As a result of this evaluation, recommended values of soil parameters for design are suggested. It is shown that the performance of two field installations is satisfactorily predicted using these recommended values. A study of the constructability of soils showed that granular soils are much easier to place and compact to minimize structural distortion and provide much higher support to the conduit than cohesive soils. A design criterion for the width of the structural backfill envelope based on limiting values of deflection is presented. A design approach for conduit wall thrust is also developed. This approach considers the effects of conduit shape, width of structural backfill envelope, fill height, conduit size, and compression and bending stiffnesses. Arching factors from different methods are compared. After reviewing the past work on buckling, the elastic continuum theory is used to develop buckling design charts. The effects of the width of structural backfill envelope, relative stiffness between the conduit and the structural backfill soil, the relative stiffness between the surrounding soil and the structural backfill soil, and the height of fill are included in these charts.
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Cybulski, Robert. "Analysis of local stability of doubly corrugated thin-walled structures." Rozprawa doktorska, 2015. https://repolis.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=61736.
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Cybulski, Robert. "Analysis of local stability of doubly corrugated thin-walled structures." Rozprawa doktorska, 2015. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=61736.
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顧浩民. "Light extraction enhancement for LED having periodically corrugated enhancement structures." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/26891315863065011647.
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Perng, Sheng-Fuh, and 彭生富. "The Structural Behaviour of Seismic Shear Wall made of Corrugated Steel Plate." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/49345329581003648736.
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博士<br>國立成功大學<br>土木工程學系<br>88<br>Abstract
Reinforced concrete buildings with shearwalls are very efficient to resist earthquake disturbances. In general, reinforced concrete frames are governed by flexure and shearwalls are governed by shear. If a structure includes both frames and shearwalls, it is generally governed by shearwalls. However, the ductility of ordinary reinforced concrete framed shearwalls is very limited. To improve the ductility, this paper describes experiments on framed shearwalls made of corrugated steel, and the experimental results are compared with ordinary reinforced concrete frames and shearwalls. The tests include four framed shearwalls. The effect of wall plate thickness is investigated. It is found that framed shearwalls made of corrugated steel are feasible because their seismic performance (including ductility and dissipated energy) is greatly improved.
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Yu, Daming. "The lateral torsional buckling strength of steel I-girders with corrugated webs /." Diss., 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3215864.
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Abbas, Hassan H. "Analysis and design of corrugated web I-girders for bridges using high performance steel /." Diss., 2003. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3117135.
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Halim, Riandy, and 林光葵. "CYCLIC BEHAVIOR OF STEEL CORRUGATED PLATE DAMPER AND ITS APPLICATION TO STRUCTURAL PERFORMANCE IMPROVEMENT." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4ts88f.
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碩士<br>國立中央大學<br>土木工程學系<br>107<br>i
ABSTRACT
There are many devices that’s already invented to encounter earthquake problem. One of the devices is called damper. Damper is a device that earmarked to adsorb an energy, so the energy that subjected on the structure can diminished. Damper can be attached on the existing structure or to a new structure.
Dampers can be categorized by the mechanism of itself to adsorb the energy. For examples there is viscous damper, friction damper, yield damper, and many others. For this research, it will discuss about the metallic damper that used yield and friction to dissipated the energy. Metallic damper is one kind of energy dissipation devices in structure passive control. During the earthquake or wind, structure vibration could be well controlled through energy dissipation with hysteretic deformation.
In this research, the main point is it wants to overcome disadvantage that consist in several model of metallic damper. As we know, most of the metallic damper dissipated energy by using the yield of itself, but the yielding point just occurs in some of the part of the damper, and the other parts remain elastic. This research wants to proposed a new model of metallic damper, that the yielding will occur in most of the part of the damper, the name the damper is corrugated plate damper.
Corrugated plate damper consists of three main parts, the steel plate that will be bend, and two of the bounding boxes which will be put on the top and bottom of the steel plate with a corrugated pattern on one of its surfaces that will bend the steel plate. The steel plate will be attached to the upper beam, and two of the bounding boxes will be support by an A-support and connected to the lower beam.
Corrugated plate damper use drift story of two floor to generated relative displacement between lower beam and upper beam, so when there is a relative displacement between two of it, the plate will be moved and when the steel plate is move, it will follow the pattern that has been determined by the bounding box. So, corrugated plate damper is a metallic damper that will dissipate energy by combine yielding from the bending of the steel plate and friction because the contact of the steel plate and the boundary boxes simultaneously.
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SULIKHAH, SITI, and SITI SULIKHAH. "Comparison of Uniform Grating and Partially Corrugated Grating DFB Structures for High-Speed Directly Modulated Lasers." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/99093290057512742918.
Full textAbstract:
碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>Future data center optical networks desired a high-speed laser to meet IEEE 802.3bs standard, which is defining an Ethernet speed of 400 Gb/s (4x100 Gb/s or 8x50 Gb/s) for network aggregation applications. The objectives of designing high-speed lasers are low-cost, reliable, and high performance. Direct-modulation of semiconductor lasers (DML) was proposing an attractive choice for large-capacity transmission. However, DMLs have some disadvantages, including a relatively small direct modulation bandwidth and the modulation induced chirp effects that prevent their high-speed applications. One of the solutions for enhancing modulation bandwidth of DMLs is using short cavity length. Practically, a shorter cavity length (L< 200 µm) is difficult to cleave and handle. The partially corrugated grating (PCG) structure is able to improve the resonance frequency of laser and provide a high immunity to external reflections.
In this thesis, the characteristics of DMLs with a uniform grating (UG) and partially corrugated grating (PCG) structures were analyzed and compared in various aspects. The simulated frequency response of DMLs agreed with the calculated results in terms of smaller modulation bandwidth for longer laser lengths. We have achieved a better dynamic performance by using PCG-DMLs against UG-DMLs for a data rate up to 50Gbps. PCG-DFB structures have obtained -3dB bandwidth of >30 GHz with a side-mode suppression ratio (SMSR) of>45dB by using a grating length of 150 µm for 200-µm long lasers. These enhancements make PCG-DMLs attractive as high-speed light sources for future broadband access networks.
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Subramanian, Kumar. "Analysis of homogeneous film flows on inclined surfaces and on corrugated sheet of packing using CFD." Doctoral thesis, 2013. https://tubaf.qucosa.de/id/qucosa%3A22981.
Full textAbstract:
The key to success in separation of liquid mixtures is the efficient creation and utilization of vapour-liquid contact area. By packing the column with gas-liquid contact devices such as structured packing, the vapour-liquid contact area can be increased. However, the efficiency of these packed columns depends strongly on the local flow behaviour of the liquid and vapour phase inside the packing.
The aim of this work was to develop three-dimensional CFD models to study the hydrodynamic behaviour on the corrugated sheets of packing. Different approaches are possible to simplify the problem and to extend it for more complex flow scenarios. In this work, three-dimensional CFD simulations were performed to study the complete fluid-dynamic behaviour. This was performed in two steps.
As a first step, the developed model was validated with experimental studies using a simplified geometry i.e., an inclined plate. The three-dimensional Volume-of-Fluid (VOF) model was utilized to study the flow behaviour of the gas-liquid countercurrent flow. The influence of the liquid surface tension was taken into consideration using the Continuum Surface Force (CSF) model. The wetting characteristics of liquids with different viscosity (1 and 5 mPas) and contact angle (70° and 7°) were studied for different flow rates. Three different mixtures (water, water-glycerol (45 wt. %) and silicon-oil (DC5)) were considered. Initially, the rivulet width of experiments and simulations were compared and an error of 5 % maximum was determined. The results were also in good agreement with earlier studies. The percentage of wetting due to changes in flow rate, viscosity and contact angle was compared and discussed. For all tested systems, excellent agreement between the experiments and simulation studies was found. In addition, profiles of the velocity in the film at film flow conditions over a smooth inclined plate obtained from simulations were compared with experimental profiles obtained using a μPIV technique. A detailed sensitivity study was also performed in order to understand the changes in the velocity profiles due to small change in liquid flow rate, temperature and inclination angle.
As a next step, the developed model was extended to geometries resembling real corrugated sheets of packing used in industrial applications. In earlier numerical studies of structured packing, geometries were simplified to enable easy meshing and faster computation. In this work, the geometries of corrugated sheets of packing were developed without any simplification and the flow behaviour was studied using the model validated in the first step. The flow behaviour on sheets with different geometrical modifications such as smooth and triangular crimp surfaces as well as perforations on the sheets were numerically studied and quantitatively compared with experimental studies for the three different fluid test systems. The agreement between the simulations and experiments was within an acceptable range for all system. The difference in the interfacial area between the corrugated sheets of a packing with and without perforation was analyzed and the prediction ability of different empirical correlations for the interfacial area available in literature was also compared and discussed.
Furthermore, the numerical study was extended to understand the influence of the second corrugated sheet. Studying the flow behaviour between two sheets experimentally is very challenging, especially inside opaque packing. The model proved to be a very suitable tool to study the hold-up of the liquid between two sheets, the change in wetting behaviour due to small change in liquid inlet position. The results are also in good agreement with the earlier experimental studies, where researchers measured the liquid hold-up mainly in the region where two corrugated sheets touch each other.
The three-dimensional CFD model was validated to study the flow behaviour on corrugated sheets of packing. The results from the simulations agree very well with findings from the experimental studies in terms of wetting and hold-up.