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Journal articles on the topic 'Structural composite elements'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Majzner, Michał, and Andrzej Baier. "Computer Aided Analysis of Composite Structural Elements." Applied Mechanics and Materials 657 (October 2014): 765–69. http://dx.doi.org/10.4028/www.scientific.net/amm.657.765.

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The article presents a reflection on the definition of the feature, which enabled the development of feature-based method for modeling of composite structural components. The need for defining feature is a direct result of the ambiguity of statements or narrow definitions and their applications. So far are well developed feature, which are used in process design (CAD) - geometric feature, design feature and in the process of manufacturing (CAM) - Technology feature, and also focused on functionality (CAE - motion simulation) functional feature. The feature representation of a fully functioning feature-based system that does the aggregation of information about the structure of a construction object made from layered composites.. This approach is based on a single, independent feature representation that can be used for design, finite element analysis, technology process planning. The paper describes the main approach to the engineering analysis with the use of FEM and a convenient method of simplifying the geometry of the model and the composition of the composite. Also discussed are possible extensions to features to enhance the finite element meshing process.

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2

Latypova, E. Yu, and Yu A. Tsumarev. "Composite structural elements for permanent joints." Welding International 31, no. 3 (December 2, 2016): 242–46. http://dx.doi.org/10.1080/09507116.2016.1243755.

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3

Lu, Y. P., J. M. Bai, and C. T. Sun. "Vibration Damping of Laminated Composite Structural Elements." Key Engineering Materials 141-143 (September 1997): 623–50. http://dx.doi.org/10.4028/www.scientific.net/kem.141-143.623.

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4

Meier, Urs. "Structural Tensile Elements made of Advanced Composite Materials." Structural Engineering International 9, no. 4 (November 1999): 281–85. http://dx.doi.org/10.2749/101686699780481817.

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5

Junek, Jiří, René Čechmánek, Bohdan Nešpor, and Pavel Steffan. "Use of Composite Elements for Monitoring of Concrete under Loading." Advanced Materials Research 1000 (August 2014): 326–29. http://dx.doi.org/10.4028/www.scientific.net/amr.1000.326.

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The object of our project is a design and verification of composite elements of defined shape with effective content of carbon particles and fibers. These composites should be able to monitor internal state of selected structural elements in order to eliminate negative effects of loading.

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6

Hwang, W. C., and C. T. Sun. "A finite element iterative approach for analysis of laminated composite structural elements." Computers & Structures 31, no. 1 (January 1989): 55–62. http://dx.doi.org/10.1016/0045-7949(89)90167-3.

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7

Alma´nzar, Leonel I., and Luis A. Godoy. "Design Sensitivity of Buckled Thin-Walled Composite Structural Elements." Applied Mechanics Reviews 50, no. 11S (November 1, 1997): S3—S10. http://dx.doi.org/10.1115/1.3101848.

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This paper presents a theory and applications to account for changes in the fundamental, buckling, and post-buckling states when design parameters of a composite material are modified. The influence of micro-mechanical parameters (the volume fraction and the fiber orientation) and of cross-sectional dimensions is investigated. A numerical example for columns made of composite materials is presented. Sensitivity is studied for local buckling loads. Explicit expressions are obtained for the sensitivities in the form of perturbation expansions. A beam under transverse load is also investigated, and geometric design parameters employed to investigate sensitivity. The information from the sensitivity analysis can be used to improve a design by modification of the buckling load.

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8

Lechner, Thomas, Sebastian Felix Gehrlein, and Oliver Fischer. "Structural behaviour of composite dowels in thin UHPC elements." Steel Construction 9, no. 2 (May 2016): 132–37. http://dx.doi.org/10.1002/stco.201610012.

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9

Pestrenin, V. M., I. V. Pestrenina, and L. V. Landik. "Nonstandard Problems for Structural Elements with Spatial Composite Ribs." Mechanics of Composite Materials 51, no. 4 (September 2015): 489–504. http://dx.doi.org/10.1007/s11029-015-9520-9.

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10

Grzymski, Filip, Dorota Marcinczak, Tomasz Trapko, and Michał Musiał. "FRCM composites mesh anchorage – a way to increase strengthening effectiveness." MATEC Web of Conferences 251 (2018): 02044. http://dx.doi.org/10.1051/matecconf/201825102044.

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FRCM (Fabric Reinforced Cementitious Matrix) composites are the next stage of development of composite structural reinforcement after FRP (Fibre Reinforced Polymers) composites. The main element that distinguishes the newer FRCM system is the matrix of the composite – mineral matrix instead of epoxy resin. Changes in the structure of the composite, resulting from the change of the matrix, have a big impact on its work mechanisms. This paper discusses FRCM composites and shows its effectiveness in reinforced concrete elements strengthening. The basic information on FRCM mesh fibres material differences and composite failure modes are given. Current trends and directions of composite structural strengthening and the latest research in the area of increasing FRCM composite strengthening effectiveness, that are being conducted by the authors, are presented.

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11

Shendrik, V. A. "STRUCTURAL EVALUATION OF REINFORCED CONCRETE COLUMN WITH COMPOSITE GFRP SHELL -- A STRUCTURAL ELEMENTOF BRIDGE PIER." Russian Journal of Building Construction and Architecture, no. 2(50) (May 21, 2021): 74–84. http://dx.doi.org/10.36622/vstu.2021.50.2.006.

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Statement of the problem. It’s considered the problem of developing a methodology for structural evaluation of hybrid design - a reinforced concrete column combined with external composite GFRP (glass-fiber-reinforced-plastic) shell. This hybrid design is intended for bridge piers. Results. As a result of a study, theoretical relationships were formulated to determine the longitudinal and transverse stresses and relative deformations of hybrid column structural elements. The developed formulas take into account the cooperation of triaxial compressed concrete core and an anisotropic composite GFRP shell. Conclusions. The obtained theoretical dependences of the hybrid column’s elements behavior make it possible to develop a structural evaluation methodology of bridge piers hybrid columns. The findings of the investigation are proposed to be applied in the structural evaluations of the bridges piers hybrid columns with composite GFRP elements.

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OPRAN, Constantin Gheorghe, Cătălina Bivolaru, and Diana Murar. "Researches Concerning Structural and Mechanical Behavior of Sandwich Composite Polymeric Products." Key Engineering Materials 498 (January 2012): 151–60. http://dx.doi.org/10.4028/www.scientific.net/kem.498.151.

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The sandwich composite polymeric products have a wide utilization in various fileds like aircraft and automotive construction, load bearing structures, sports equipment, more specifically, wherever weight-saving is required. Sandwich composites polymeric products represent excellent examples of the potential offered by composite materials. The combination of two composite faces and a lightweight polystyrene core allows obtaining a high flexural stiffness with a weak mass. This paper deals with the analysis of the structural and mechanical behavior properties of the core, adhesive and faces, for sandwich composite polymeric products. There are also presented the investigation results on how different specific factors like: mechanical and structural behavior, interface between the faces and core, constant force resistance in time, the reinforcing elements (fiber glass), the polyester core do influence the machinability of sandwich composites polymeric products..

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13

Podsiadły, Bartłomiej, Piotr Matuszewski, Andrzej Skalski, and Marcin Słoma. "Carbon Nanotube-Based Composite Filaments for 3D Printing of Structural and Conductive Elements." Applied Sciences 11, no. 3 (January 30, 2021): 1272. http://dx.doi.org/10.3390/app11031272.

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In this publication, we describe the process of fabrication and the analysis of the properties of nanocomposite filaments based on carbon nanotubes and acrylonitrile butadiene styrene (ABS) polymer for fused deposition modeling (FDM) additive manufacturing. Polymer granulate was mixed and extruded with a filling fraction of 0.99, 1.96, 4.76, 9.09 wt.% of CNTs (carbon nanotubes) to fabricate composite filaments with a diameter of 1.75 mm. Detailed mechanical and electrical investigations of printed test samples were performed. The results demonstrate that CNT content has a significant influence on mechanical properties and electrical conductivity of printed samples. Printed samples obtained from high CNT content composites exhibited an improvement in the tensile strength by 12.6%. Measurements of nanocomposites’ electrical properties exhibited non-linear relation between the supply voltage and measured sample resistivity. This effect can be attributed to the semiconductor nature of the CNT functional phase and the occurrence of a tunnelling effect in percolation network. Detailed I–V characteristics related to the amount of CNTs in the composite and the supply voltage influence are also presented. At a constant voltage value, the average resistivity of the printed elements is 2.5 Ωm for 4.76 wt.% CNT and 0.15 Ωm for 9.09 wt.% CNT, respectively. These results demonstrate that ABS/CNT composites are a promising functional material for FDM additive fabrication of structural elements, but also structural electronics and sensors.

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14

Kunčická, Lenka, Adéla Macháčková, Ludmila Krátká, and Radim Kocich. "Analysis of Deformation Behaviour and Residual Stress in Rotary Swaged Cu/Al Clad Composite Wires." Materials 12, no. 21 (October 23, 2019): 3462. http://dx.doi.org/10.3390/ma12213462.

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Both copper and aluminum are widely applicable throughout a variety of industrial and commercial branches, however, joining them in a composite provides the possibility of combining all their advantageous properties in one material. This study investigates uniquely sequenced copper–aluminum clad composite wires, fabricated via rotary swaging technology. The composites were processed at 20 °C and 250 °C to a diameter of 5 mm. Structural observations and the determination of residual stress within both elements of the swaged wires were performed via electron microscopy; the experimental results were correlated with numerical predictions. As shown in the results, both the applied swaging force and temperature affected the plastic flow, which had a direct influence on residual stress and texture development; the Alsheath elements exhibited ideal rolling textures, whereas the Cuwires elements featured ideal shear texture orientation. The grains within both the Alsheath elements of the 5 mm composite wire were refined down to sub-micron size. Structural restoration also had a positive influence on residual stress.

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15

Yan, Zhi Min, Yong Fei Du, Jun Guo Huang, and Yu Shun Li. "Approach to Steel-Bamboo Composite Structure System." Applied Mechanics and Materials 300-301 (February 2013): 1263–66. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.1263.

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Modern bamboo structural system is a new type of green sustainable building technology, conform with our country’s requirements of developing environment-protecting and energy-saving buildings. This paper presents a new lightweight, high-strength , earthquake-resistant and energy-saving system-steel-bamboo composite structural systems , and given the various structural elements of the composite structural systems of steel-bamboo production methods . This paper also gives the production methods of steel-bamboo composite elements. Steel-bamboo-structural system can per-fectly combine steel and bamboo to bear load together, and it have excellent mechanical properties and broad application prospects.

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16

Flansbjer, Mathias, Dániel Honfi, Daniel Vennetti, Urs Mueller, Natalie Williams Portal, and Lech Wlasak. "Structural performance of GFRP connectors in composite sandwich facade elements." Journal of Facade Design and Engineering 4, no. 1-2 (September 22, 2016): 35–52. http://dx.doi.org/10.3233/fde-160049.

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17

Afsar, A. M., N. M. L. Huq, F. A. Mirza, and J. I. Song. "Solution to Elasticity Problems of Structural Elements of Composite Materials." Journal of The Korean Society for Composite Materials 23, no. 3 (June 30, 2010): 19–30. http://dx.doi.org/10.7234/kscm.2010.23.3.019.

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18

Komarov, Valeriy A., Alexander A. Pavlov, Svetlana A. Pavlova, and Ramaz V. Charkviani. "Reinforcement of Aerospace Structural Elements Made of Layered Composite Materials." Procedia Engineering 185 (2017): 126–30. http://dx.doi.org/10.1016/j.proeng.2017.03.329.

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19

Lacis, Raitis. "Circular hollow section connectors in timber-concrete composite structural elements." Baltic Journal of Road and Bridge Engineering 11, no. 1 (March 25, 2016): 70–76. http://dx.doi.org/10.3846/bjrbe.2016.08.

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This paper presents results of the laboratory tests of timber-concrete structural connectors applicable (but not limited to) road/pedestrian bridges. The tested elements are discrete circular hollow section connectors installed in the pre-drilled slots of a glulam. Symmetrical push-out tests are conducted for two groups of connectors: 1) with wood core not removed; no interlayer between wood and concrete; 2) concrete in-fill core instead of the wood core; waterproofing membrane interlayer between concrete and timber elements. Main structural parameters of the connectors are established including ultimate shear capacity and slip modulus. Relationship between the connector’s stiffness and ultimate shear capacity is established and failure mechanisms are briefly discussed.

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20

Kokurov, A. M., and I. N. Odintsev. "Analysis of structural elements made of composite materials with defects." Russian Aeronautics 60, no. 1 (January 2017): 21–26. http://dx.doi.org/10.3103/s1068799817010044.

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21

Ireman, T., J. C. Thesken, E. Greenhalgh, R. Sharp, M. Gädke, S. Maison, Y. Ousset, F. Roudolff, and A. La Barbera. "Damage propagation in composite structural elements-coupon experiments and analyses." Composite Structures 36, no. 3-4 (November 1996): 209–20. http://dx.doi.org/10.1016/s0263-8223(96)00078-5.

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22

Johnson, WS, JE Masters, C. Cappelletti, A. Rivolta, and G. Zaffaroni. "Environmental Effects on Mechanical Properties of Thick Composite Structural Elements." Journal of Composites Technology and Research 17, no. 2 (1995): 107. http://dx.doi.org/10.1520/ctr10473j.

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23

Potdar, Neha. "Study of Different Structural Elements Used For Thin Composite Plate." IOSR Journal of Mechanical and Civil Engineering 7, no. 6 (2013): 37–40. http://dx.doi.org/10.9790/1684-0763740.

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24

Kayumov, R. A., D. E. Strakhov, A. M. Sulejmanov, and E. B. Tuysina. "Estimation of the residual strength of supporting composite structural elements." IOP Conference Series: Materials Science and Engineering 934 (October 8, 2020): 012042. http://dx.doi.org/10.1088/1757-899x/934/1/012042.

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25

Barzov, A. A., V. M. Korneeva, S. S. Korneev, and A. V. Cherednichenko. "Probabilistic Modeling of Adhesive-Latent Interaction of Structural Elements of Composite Materials." Quality and life 25, no. 1 (March 23, 2020): 76–81. http://dx.doi.org/10.34214/2312-5209-2020-25-1-76-81.

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A block diagram of the interaction of the main elements of polymer composite materials and a probabilistic model of their functioning are proposed. The double role of the adhesion factor of polymer composite materials is shown and the possibility of its optimization is established. The kinetics of fracture of polymer composite materials is analyzed taking into account the strength of adhesive bonds and prospects for further research are outlined.

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26

Wang, Yongjing, Duc Truong Pham, Zhichun Zhang, Jinjun Li, Chunqian Ji, Yanju Liu, and Jinsong Leng. "Sustainable self-healing at ultra-low temperatures in structural composites incorporating hollow vessels and heating elements." Royal Society Open Science 3, no. 9 (September 2016): 160488. http://dx.doi.org/10.1098/rsos.160488.

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Self-healing composites are able to restore their properties automatically. Impressive healing efficiencies can be achieved when conditions are favourable. On the other hand, healing might not be possible under adverse circumstances such as very low ambient temperature. Here, we report a structural composite able to maintain its temperature to provide a sustainable self-healing capability—similar to that in the natural world where some animals keep a constant body temperature to allow enzymes to stay active. The composite embeds three-dimensional hollow vessels with the purpose of delivering and releasing healing agents, and a porous conductive element to provide heat internally to defrost and promote healing reactions. A healing efficiency over 100% at around −60°C was obtained. The effects of the sheets on the interlaminar and tensile properties have been investigated experimentally. The proposed technique can be implemented in a majority of extrinsic self-healing composites to enable automatic recovery at ultra-low temperatures.

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27

Buyuktaskin, Halet Almila Arda, Mehmet Serkan Yatagan, Gulseren Erol Soyoz, Leyla Tanacan, and Morvarid Dilmaghani. "EXPERIMENTAL INVESTIGATION OF THE DURABILITY OF LOAD BEARING TIMBER-GLASS COMPOSITES UNDER THE EFFECTS OF ACCELERATED AGING." Journal of Green Building 14, no. 2 (March 2019): 45–59. http://dx.doi.org/10.3992/1943-4618.14.2.45.

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Although timber was used extensively as a structural material for traditional buildings in Turkey in the past, usage of structural timber decreased significantly over time and timber has been largely replaced by other materials. As timber is a natural, durable and sustainable material, it would be desirable to re-introduce timber structural elements to contemporary construction in a form that is appealing to industry. Timber-glass composite structural elements are potentially a good candidate for this purpose. To that end, a series of tests were conducted on load-bearing timber-glass composites in order to understand the long–term structural performance of the composite material under atmospheric conditions; to decrease the recurring cost of repair and maintenance; and to minimize the exhaustion of raw materials and energy. In this paper, the first part of this experimental work is presented, which focuses on the durability of timber-glass composite under the effects of accelerated aging, carried out on small-sized timber-glass composite specimens. Accelerated aging effects were observed under wetting-drying, freezing-thawing, UV effects, resistance to acids and high temperature. The mechanical strength of the timber-glass composite specimens before and after the effect of accelerated aging was measured by adhesion and shear strength tests and a comparative analysis of the results was carried out. The results of the experiments indicate that timber-glass composite is suitable to be used under protection from environmental conditions.

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Katunin, Andrzej, and Wojciech Moczulski. "Recent Research on Thermal Fatigue of Composite Elements of Transport Means." Key Engineering Materials 588 (October 2013): 243–48. http://dx.doi.org/10.4028/www.scientific.net/kem.588.243.

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Thermal fatigue occurred in many engineering constructions made of polymeric composites subjected to the intensive loading and vibrations. During this process the mechanical energy is dissipated in the form of heat due to the hysteretic behaviour of the material, which introduces the self-heating effect. In some cases the self-heating effect dominates the fatigue process and intensifies much structural degradation of composite elements. The paper presented a survey of engineering applications in which the self-heating effect and thermal fatigue occurred and recent advances in theoretical and experimental research in this area. Selected results of experimental studies were presented and discussed.

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29

Bhagat, Diwakar, Suresh Bhalla, and Roger P. West. "Fabrication and structural evaluation of fibre reinforced bamboo composite beams as green structural elements." Composites Part C: Open Access 5 (July 2021): 100150. http://dx.doi.org/10.1016/j.jcomc.2021.100150.

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30

Weber, Tony, Maik Gude, and Tobias Kastner. "Experimental and Numerical Studies on Integration Thermoplastic Composite Compatible Piezoelectric Ceramics for Actuatory Application of Cylindrical Hollow Structures." Materials Science Forum 825-826 (July 2015): 556–62. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.556.

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Regarding the economical use of fiber-reinforced plastics (FRP) as a construction material for structural components whose additional value caused not only in their high specific mechanical properties. Due to the layerwise structure definition of continuous fiber reinforced composites the corresponding production technologies offers a high potential for integration of additional functional elements. Past efforts to the integration of functions in fiber-reinforced composites usual provide in front of a passive use of the piezoelectric effect (eg. structural-health monitoring). Through efficient and structurally defined using of piezoceramic actuators, the planar structure topology of cylindrical hollow FRP profiles can be actively influenced. Based on experimental studies on the definition of basic concepts for the integration of thermoplastic compatible piezoceramic modules (TPM) in fiber composite tubular segments, this paper deals with the understanding and performance capabilities of such actuarical hollow frp structures. The selective excitation and manipulation of the vibration behavior of such rotationally symmetric structures serves for generation of wave effects with radial translational characteristic. The performed experimental studies on the structural behavior of active piezo integral pipe segments are abstracted and compared by means of numerical simulations using multi-physical elements.

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31

LI, Yulong; ;., Vasiliy N. DOBRYANSKIY, and Alexander A. OREKHOV. "MODELLING OF CRACK DEVELOPMENT PROCESSES IN COMPOSITE ELEMENTS BASED ON VIRTUAL CRACK CLOSURE TECHNIQUE AND COHESIVE ZONE MODEL." Periódico Tchê Química 17, no. 35 (July 20, 2020): 591–99. http://dx.doi.org/10.52571/ptq.v17.n35.2020.50_li_pgs_591_599.pdf.

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Fiber composites based on polymer matrices are promising structural materials that meet high requirements for strength, reliability, durability, and hardness. Therefore, composite materials are widely used as structural materials for aerospace products. The problems associated with the destruction of fiber composites were relevant at all stages of technology development. A variety of reinforcing fibers and polymer binders, as well as reinforcement schemes, allow directional control of strength, stiffness, level of working temperatures and other properties of polymer composite materials. This article discusses a methodology for experimental determination of the mechanical properties of carbon-based fiber-reinforced polymer composite materials, including the determination of the interlayer fracture toughness under loading under separation conditions using the doublecantilever beam method (DCB) and the fracture toughness under transverse shear conditions using the ENF (End-Notched Flexure) method and interlayer strength. The test results of samples of polymer composite materials with a carbon reinforcing filler with different surface densities are presented. The experimental data were used to identify the parameters of the VCCT (Virtual Crack Closure Technique) and CZM (Cohesive Zone Model) closure models used to describe the development of cracks in the composites under consideration. It was found that the parameters determining the strength of layered composites are such characteristics as interlayer strength and crack resistance. It was found that the decrease in the strength of individual layers of the composite does not always affect the current stress state of the entire structure, which is often difficult to detect experimentally, but can significantly affect the further behavior of the object under study provided that the crack develops further.

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32

Döbrich, Oliver, Thomas Gereke, and Chokri Cherif. "Modelling of textile composite reinforcements on the micro-scale." Autex Research Journal 14, no. 1 (March 14, 2014): 28–33. http://dx.doi.org/10.2478/v10304-012-0047-z.

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Abstract Numerical simulation tools are increasingly used for developing novel composites and composite reinforcements. The aim of this paper is the application of digital elements for the simulation of the mechanical behaviour of textile reinforcement structures by means of a finite element analysis. The beneficial computational cost of these elements makes them applicable for the use in large models with a solution on near micro-scale. The representation of multifilament yarn models by a large number of element-chains is highly suitable for the analysis of structural and geometrical effects. In this paper, a unit cell generating method for technical reinforcement textiles, using digital elements for the discretization, is introduced.

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33

Iskhakov, I., and Y. Ribakov. "Structural Phenomenon of Cement-Based Composite Elements in Ultimate Limit State." Advances in Materials Science and Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/4710752.

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Cement-based composite materials have minimum of two components, one of which has higher strength compared to the other. Such materials include concrete, reinforced concrete (RC), and ferrocement, applied in single- or two-layer RC elements. This paper discusses experimental and theoretical results, obtained by the authors in the recent three decades. The authors have payed attention to a structural phenomenon that many design features (parameters, properties, etc.) at ultimate limit state (ULS) of a structure are twice higher (or lower) than at initial loading state. This phenomenon is evident at material properties, structures (or their elements), and static and/or dynamic structural response. The phenomenon is based on two ideas that were developed by first author: quasi-isotropic state of a structure at ULS and minimax principle. This phenomenon is supported by experimental and theoretical results, obtained for various structures, like beams, frames, spatial structures, and structural joints under static or/and dynamic loadings. This study provides valuable indicators for experiments’ planning and estimation of structural state. The phenomenon provides additional equation(s) for calculating parameters that are usually obtained experimentally and can lead to developing design concepts and RC theory, in which the number of empirical design coefficients will be minimal.

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34

Flansbjer, Mathias, Natalie Williams Portal, and Daniel Vennetti. "Verification of the Structural Performance of Textile Reinforced Reactive Powder Concrete Sandwich Facade Elements." Applied Sciences 9, no. 12 (June 15, 2019): 2456. http://dx.doi.org/10.3390/app9122456.

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As a part of the SESBE (Smart Elements for Sustainable Building Envelopes) project, non-load bearing sandwich elements were developed with Textile Reinforced Reactive Powder Concrete (TRRPC) for outer and inner facings, Foam Concrete (FC) for the insulating core and Glass Fiber Reinforced Polymer (GFRP) continuous connectors. The structural performance of the developed elements was verified at various levels by means of a thorough experimental program coupled with numerical analysis. Experiments were conducted on individual materials (i.e., tensile and compressive tests), composites (i.e., uniaxial tensile, flexural and pull-out tests), as well as components (i.e., local anchorage failure, shear, flexural and wind loading tests). The experimentally yielded material properties were used as input for the developed models to verify the findings of various component tests and to allow for further material development. In this paper, the component tests related to local anchorage failure and wind loading are presented and coupled to a structural model of the sandwich element. The validated structural model provided a greater understanding of the physical mechanisms governing the element’s structural behavior and its structural performance under various dead and wind load cases. Lastly, the performance of the sandwich elements, in terms of composite action, was shown to be greatly correlated to the properties of the GFRP connectors, such as stiffness and strength.

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35

Kędziora, Piotr. "Optimal Design of PZT Actuators and Sensors in Composite Structural Elements." Key Engineering Materials 542 (February 2013): 59–73. http://dx.doi.org/10.4028/www.scientific.net/kem.542.59.

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In this paper, the various optimization criteria used for optimal placement of piezoelectric actuators on laminated structures are discussed. Piezoelectric materials are used as layers or fibers that are embedded within or bonded to the surfaces of a structure. The present formulation of optimal design introduces also boundaries of piezoelectric patches as new class of design variables.

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36

Ushakov, A. E., A. A. Safonov, I. V. Sergeichev, A. Yu Konstantinov, and F. K. Antonov. "Modeling process-induced deformations of structural elements made of composite materials." Journal of Machinery Manufacture and Reliability 43, no. 1 (January 2014): 36–41. http://dx.doi.org/10.3103/s1052618814010191.

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37

BONDAREV, B. A., T. N. STORODUBTSEVA, D. A. KOPALIN, and S. V. KOSTIN. "Wood-Glass Fiber Composite Materials in Structural Elements of Tram Tracks." Stroitel'nye Materialy 777, no. 12 (2019): 73–77. http://dx.doi.org/10.31659/0585-430x-2019-777-12-73-77.

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38

Wiggenraad, J. F. M., R. Aoki, M. Gädke, E. Greenhalgh, D. Hachenberg, K. Wolf, and R. Bübl. "Damage propagation in composite structural elements — analysis and experiments on structures." Composite Structures 36, no. 3-4 (November 1996): 173–86. http://dx.doi.org/10.1016/s0263-8223(96)00076-1.

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39

Yu, Chaoming, Zhaohui Huang, Ian W. Burgess, and Roger J. Plank. "Development and Validation of 3D Composite Structural Elements at Elevated Temperatures." Journal of Structural Engineering 136, no. 3 (March 2010): 275–84. http://dx.doi.org/10.1061/(asce)st.1943-541x.0000111.

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Bisagni, Chiara, and Davide Terletti. "Structural optimisation of composite elements of a Formula One racing car." International Journal of Vehicle Design 48, no. 1/2 (2008): 149. http://dx.doi.org/10.1504/ijvd.2008.021157.

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CAMANHO, P. P., C. G. DÁVILA, and S. T. PINHO. "Fracture analysis of composite co-cured structural joints using decohesion elements." Fatigue & Fracture of Engineering Materials & Structures 27, no. 9 (October 7, 2008): 745–57. http://dx.doi.org/10.1111/j.1460-2695.2004.00695.x.

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Kenny, R. P., E. Gutierrez, M. P. Whelan, and A. C. Lucia. "Composite Structural Element Characterisation Using Fibre Optic Strain Sensors." Advanced Composites Letters 6, no. 5 (September 1997): 096369359700600. http://dx.doi.org/10.1177/096369359700600501.

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Fibre optic sensor systems have been developed for characterisation and monitoring of structural elements. The particular application area reported here is on testing of pultruded composite beams. Demodulation schemes for in-fibre Bragg grating strain sensors using either Acousto-Optic tuneable filters or passive techniques are described. It is found that the fibre optic sensor measurements correspond well with those of standard electrical gauges, and demonstrate their potential as on-line structural diagnostic devices.

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Grishin, V. I., M. A. Glebova, Yu I. Dudarkov, E. A. Levchenko, and M. V. Limonin. "Strength analysis of structural elements and metal-composite joints of a flying vehicle." Spacecrafts & Technologies 4, no. 4 (December 4, 2020): 191–200. http://dx.doi.org/10.26732/j.st.2020.4.01.

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The strength and load-bearing capacity analyses results for flying vehicle typical structural elements and joints are presented in the paper. Calculations were made with the use of nonlinear finite element method, implemented in software NASTRAN and ABAQUS. Structural composite panels and metal-composite joints in attachment points of moving components under consideration for research. Employed computational models and procedures, obtained results analysis process are presented. Numerical strength estimations of structural panels and joint strength confirmed with test results. On the example of a virtual test simulation of composite panels’ strength test in a shear frame, the effect of experimental conditions on obtaining results is evaluated. It is shown that boundary conditions realized in such tests cannot always give correct values of panels’ global buckling critical stress. The computation results of buckling and strength of metal-composite joints in attachment points of moving components are presented. The computation performed on a detailed model with employing solid elements and taking into account contact interaction between joint parts, geometrical and physical nonlinearities. Composite strength in bolted joints is made based on Nuismer criterion. The formed recommendations for improvement made it possible to avoid earlier failure of the considered joint in strength tests.

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Apicella, A., Enrico Armentani, Renato Esposito, and Michele Pirozzi. "Finite Element Analysis of a Composite Bulkhead Structure." Key Engineering Materials 348-349 (September 2007): 553–56. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.553.

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Reducing structural weight is one of the major ways to improve aircraft performance. Lighter and/or stronger materials allow greater range and speed and may also contribute to reducing operational costs. Nowadays composite materials are widely used in “primary” structural components such as fuselage, for which contrasting requirements like lightness and structural strength are required, so particular attention is necessary during its design. In this paper a composite front bulkhead, subjected to ultimate pressure load, was examined. The front bulkhead is made of a composite skin, stiffened with seven vertical stiffeners linked through metallic fittings; the whole system is joined to the fuselage by rivets. A Finite Element model was established: the used elements were four nodes shells, simulating composite layers, and two nodes bar elements, simulating rivets; the structure was clamped and a pressure load was applied to the skin. A linear static stress analysis was performed to calculate strains in particular points in which strain gauges or rosettes are placed: the numerical results, compared with experimental ones, show a good degree of correlation. Stress calculations were performed in order to verify the front and rear bulkhead structural safety.

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Tannert, Thomas, Jorge M. Branco, and Mariapaola Riggio. "RILEM TC "Reinforcement of Timber Elements in Existing Structures"." Advanced Materials Research 778 (September 2013): 1041–48. http://dx.doi.org/10.4028/www.scientific.net/amr.778.1041.

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The paper reports on the activities of the RILEM technical committee Reinforcement of Timber Elements in Existing Structures. The main objective of the committee is to coordinate the efforts to improve the reinforcement practice of timber structural elements. Recent developments related to structural reinforcements can be grouped into three categories: (i) addition of new structural systems to support the existing structure; (ii) configuration of a composite system; and (iii) incorporation of elements to increase strength and stiffness. The paper specifically deals with research carried out at the Bern University of Applied Sciences Switzerland (BFH), the University of Minho Portugal (UniMinho), and the University of Trento Italy (UNITN). Research at BFH was devoted to improve the structural performance of rounded dovetail joints by means of different reinforcement methods: i) self-tapping screws, ii) adhesive layer, and iii) a combination of self-tapping screws and adhesive layer. Research at UNITN targeted the use of dry connections for timber-to-timber composites, specifically reversible reinforcement techniques aimed at increasing the load-bearing capacity and the bending stiffness of existing timber floors. At UniMinho, double span continuous glulam slabs were strengthened with fibre-reinforced-polymers. All three examples demonstrate the improved structural performance of timber elements after reinforcing them.

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Blinkov, Pavel, Leonid Ogorodov, and Peter Grabovyy. "Failure of structural elements made of polymer supported composite materials during the multiyear natural aging." E3S Web of Conferences 33 (2018): 02009. http://dx.doi.org/10.1051/e3sconf/20183302009.

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Modern high-rise construction introduces a number of limitations and tasks. In addition to durability, comfort and profitability, projects should take into account energy efficiency and environmental problems. Polymer building materials are used as substitutes for materials such as brick, concrete, metal, wood and glass, and in addition to traditional materials. Plastic materials are light, can be formed into complex shapes, durable and low, and also possess a wide range of properties. Plastic materials are available in various forms, colors and textures and require minimal or no color. They are resistant to heat transfer and diffusion of moisture and do not suffer from metal corrosion or microbial attack. Polymeric materials, including thermoplastics, thermoset materials and wood-polymer composites, have many structural and non-structural applications in the construction industry. They provide unique and innovative solutions at a low cost, and their use is likely to grow in the future. A number of polymer composite materials form complex material compositions, which are applied in the construction in order to analyze the processes of damage accumulation under the conditions of complex nonstationary loading modes, and to determine the life of structural elements considering the material aging. This paper present the results of tests on short-term compression loading with a deformation rate of v = 2 mm/min using composite samples of various shapes and sizes.

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Siwowski, Tomasz, and Mateusz Rajchel. "Dynamic performance of a vehicular bridge with lightweight FRP composite structural elements." MATEC Web of Conferences 285 (2019): 00016. http://dx.doi.org/10.1051/matecconf/201928500016.

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The lightweight nature and low stiffness of fibre reinforced polymer (FRP) structures combined with low material damping may lead to excessive structural vibration and may increase the dynamic amplification of deformations and stresses in FRP bridge structures. The paper provides a short review on dynamic characterization of existing vehicular bridge superstructures madeof FRP structural components. Against the backdrop of a worldwide review the paper presents a field study on the dynamic characteristics of the hybrid FRP – concrete bridge superstructure recently built in Poland. The dynamic amplification factor, the first natural frequencyand the damping ratio were experimentally determined in static and dynamic load tests and compared with the relevant codes and requirements. The paper concludes by summarizing challenges related to structural dynamics of bridge superstructures with FRP structural components.

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Varghese, Vipitha, Dony Poulose, and Binu M. Issac. "Comparative Study on Structural Performance of Different Laminated Glass Composites and Brick Wall." Applied Mechanics and Materials 857 (November 2016): 231–36. http://dx.doi.org/10.4028/www.scientific.net/amm.857.231.

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Laminated glass composites are structural glass members made by assembling thin laminated panels which are connected by structural adhesives called interlayer. Laminated glass composite is a safety and security glass which enables significant improvement in the post-breakage behaviour. The interlayer of laminated glass composites ensures the integrity of the glass by holding it together. In the field of modern and innovative architectural engineering, the applications of laminated glass composites are increasing due to its lighting, aesthetics and architectural advantages. This paper introduces the buckling and vibration characteristics of different laminated glass elements using ANSYS 16.2.

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Stankiewicz, Beata. "Environmental interactions to composite elements of all-GFRP Kolding Footbridge." MATEC Web of Conferences 174 (2018): 04006. http://dx.doi.org/10.1051/matecconf/201817404006.

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Structural integrity of a composite material embraces contributions from: materials science and engineering, processing science, design and fabrication technology. It combines a number of interacting factors: the criticality of the application, the accessibility for and ability to inspect vital parts and components, the intended use including load spectrum and time, the consequences of impact, fatigue, temperature and hostile environment, the nature of inherent flaws, the constituent properties of the material system utilized, and it takes into account human factors. Glass fibre-reinforced polymer GFRP pultruded profiles have great potential in the construction industry, presenting certain advantages when compared with traditional materials, including the potentially improved durability under fluctuating levels of environmental factors. The contribution presents analysis of GFRP composite, acquired from cablestayed Fiberline Bridge exploited for 20 years in the fjord area of Kolding, Denmark. The differential scanning calorimetry (DSC) experiments were performed in the GFRP composite bridge material, in order to determine the mass variation and the energy changes suffered by the materials, as a function of temperature and time. Dynamic mechanical analysis (DMA) was allowed to detect thermal effects based on changes in the modulus or damping behavior. Tensile and flexural tests let to observe the decomposition process and had taken information of basic stress parameters of GFRP material used in Kolding Footbridge. Aforementioned analyses of durability are necessary to examine and monitoring for environmentally aged composites bridge elements.

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Sarmin, Siti Noorbaini, Johannes Welling, Andreas Krause, and Ali Shalbafan. "Investigating the possibility of geopolymer to produce inorganic-bonded wood composites for multifunctional construction material – A Review." BioResources 9, no. 4 (September 10, 2014): 7941–50. http://dx.doi.org/10.15376/biores.9.4.sarmin.

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Wood-based composites are widely used in consumer products, either in structural or non-structural applications. One of the basic elements for wood-based composites is the binder itself. Recent years have seen great development and trends in the field of eco-friendly binders in wood-based composite. There have been many concerns on the effects of formaldehyde and volatile organic compounds (VOC) released from wood-based products. Researchers have put lot of effort into developing environmental friendly products with enhanced sustainability. Binder materials with a focus on geopolymers (i.e., alumino-silicates) are discussed in this publication. The development and utilization of geopolymeric binders is relatively new in the field of wood-based composites. Up to the present there has been insufficient information regarding the manufacturing conditions and properties of wood-nonwood composite materials prepared using a geopolymeric binder. This paper considers the background of geopolymer materials and the possibilities of producing inorganic-bonded wood composite using geopolymer.

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