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Relevant bibliographies by topics / Stiffened plates

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Academic literature on the topic 'Stiffened plates'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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Journal articles on the topic "Stiffened plates"

1

Abdel Nasser, Yehia, Aly Aliraqi, and Bader El Din Ali. "Collision Analysis of Ship Side." Advanced Materials Research 199-200 (February 2011): 119–25. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.119.

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Structural design of ships against collision requires prediction of the extent of damage to stiffened plates subjected to impact. In ship structures, stiffened plates are furnished with vertical or horizontal stiffeners to sustain conventional loads such as shearing, bending and local buckling. The consideration of collision in ship structural design is especially important for tankers where accidents may cause serious environmental pollution. In predicting the extent of collision damage, FE modeling of stiffened plates using ABAQUS software is applied to demonstrate different collision scenario. Typical stiffened plates of tankers in service with different configurations of stiffeners are used to examine absorbed energy in each case. The aim of this paper is to examine the stiffener shape that absorbs more deformation energy.

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Sirajudeen, Rahima Shabeen, and Alagusundaramoorthy P. "GFRP Stiffened Plate with Square Cutout under Axial and Out-of-Plane Load." Polymers 13, no. 8 (2021): 1185. http://dx.doi.org/10.3390/polym13081185.

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The high-strength-to-weight ratio and corrosion resistance properties of glass-fiber-reinforced polymer (GFRP) composites makes them potentially well-suited for application in ship structures, bridges and off-shore oil platforms. These structures are often formed by stiffened plates and are subjected to axial load and out-of-plane load. Cutouts and openings are provided in the plates for access and maintenance. The main objective of this study was to examine the buckling behavior of GFRP-stiffened composite plates with square cutouts under a combination of axial and out-of-plane load up to failure. Four blade-stiffened composite plates without a cutout and four with square cutout were fabricated with stiffeners as a continuous layup of the flange plate using glass fiber and epoxy resin. The initial geometric imperfections were measured, and plate imperfections (Δx), stiffener imperfections (Δsy) and overall imperfections (Δsx) were calculated from the measurements. All fabricated-stiffened composite plates were tested up to failure. The finite element model was developed in ANSYS software and validated with the experimental results. It was observed that GFRP-stiffened composite plates failed by stiffener compression/stiffener tension mode of failure. The presence of out-of-plane loads and cutouts reduced the axial load carrying capacity of the stiffened composite plates.

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Quoc, Tran Huu, and Tran Ich Thinh. "Numerical-experimental investigation on vibration and bending failure of stiffened composite plates." Vietnam Journal of Mechanics 32, no. 2 (2010): 81–94. http://dx.doi.org/10.15625/0866-7136/32/2/308.

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In this paper, free vibration and bending of laminated stiffened glass fiber/polyester composite plates with laminated open section (rectangular or T shaped) and closed section (hat shaped) of stiffeners have been studied by finite element method and experiment. A nine-noded isoparametric element with nine degrees of freedom per node is developed for the plates. The stiffener element is a three-noded isoparametric beam element with five degrees of freedom per node and the stiffeners can be positioned anywhere within the plate element. The natural frequencies of the laminated stiffened plates are determined experimentally by Dewebook device and DasyLab 7.0 software. The results calculated by computational model for above plates under different boundary conditions are in good agreement with experiments. The failure problems of these stiffened glass fiber/polyester composite plates are also investigated.

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Paik, Jeom Kee, Jang Young Chung, and Min Sung Chun. "On Quasi-Static Crushing of a Stiffened Square Tube." Journal of Ship Research 40, no. 03 (1996): 258–67. http://dx.doi.org/10.5957/jsr.1996.40.3.258.

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The aims of this study are to obtain experimental data on the crushing of stiffened square tubes, and to develop a simple analytical expression for predicting the mean crushing strength of stiffened plates making up a plated structure. A series of axial crushing tests in a quasistatic condition was carried out on thin-walled square tubes which were composed of four identical panels. Specimens with longitudinal and/or transverse stiffeners, including unstiffened specimens, were tested, varying dimensions of plate and stiffener. The effective crushing length and the mean crushing strength of the test specimens were investigated. It was concluded that a longitudinally stiffened plate could reasonably be replaced by an unstiffened plate with equivalent plate thickness. Based on this approach, a simple expression for the effective crushing length and the mean crushing strength of stiffened plates was derived.

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Harik, Issam E., Meiwen Guo, and Wei-Xin Ren. "Bending Analysis of Stiffened Laminated Plates." Advances in Structural Engineering 5, no. 3 (2002): 153–63. http://dx.doi.org/10.1260/136943302760228103.

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Stiffeners are commonly attached to composite laminates to achieve higher stiffness/weight and strength/weight ratios. A layer-wise finite element formulation is developed for the bending analysis of stiffened laminated plates. The laminated plate is discretized into layers in the thickness direction and then the degenerated shell elements are employed to model each layer. The stiffener is modeled using a general 3-D beam element. Interlayer continuity relations are established for all the layers in the thickness direction. The primary advantage of the proposed finite element model lies in its application to both thin and thick laminated plates. Extensive numerical examples are presented for non-stiffened isotropic plates, non-stiffened laminates, stiffened isotropic and laminated plates. Parametric studies are conducted with different aspect ratios, plate width to thickness ratios, ply orientations, and number of layers. The results agree well with the ones reported in the literature.

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De Queiroz, João Pedro T. P., Marcelo L. Cunha, Ana Pavlovic, et al. "Geometric Evaluation of Stiffened Steel Plates Subjected to Transverse Loading for Naval and Offshore Applications." Journal of Marine Science and Engineering 7, no. 1 (2019): 7. http://dx.doi.org/10.3390/jmse7010007.

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This work searched for the optimal geometrical configuration of simply supported stiffened plates subjected to a transverse and uniformly distributed load. From a non-stiffened reference plate, different geometrical configurations of stiffened plates, with the same volume as the reference plate, were defined through the constructal design method. Thus, applying the exhaustive search technique and using the ANSYS software, the mechanical behaviors of all the suggested stiffened plates were compared to each other to find the geometrical configuration that provided the minimum deflection in the plate’s center when subjected to this loading. The optimum geometrical configuration of stiffeners is presented at the end of this work, allowing a reduction of 98.57% for the central deflection of the stiffened plate if compared to the reference plate. Furthermore, power equations were adjusted to describe the deflections for each combination of longitudinal and transverse stiffeners as a function of the ratio between the height and the thickness of the stiffeners. Finally, a unique equation for determining the central deflections of the studied stiffened plates based only on the number of longitudinal stiffeners without significantly losing accuracy has been proposed.

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Bradford, Mark A. "Buckling of longitudinally stiffened plates in bending and compression." Canadian Journal of Civil Engineering 16, no. 5 (1989): 607–14. http://dx.doi.org/10.1139/l89-095.

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The nonlinear stiffness equations that predict local and post-local buckling of plates and plate assemblies are given. These equations are validated by accurate predictions of independent test results. The elastic local buckling of longitudinally stiffened web plates in combined bending and compression is considered. Graphs which may be used to predict the optimum position of a stiffener are presented. The relationship between the area and second moment of area of a stiffener of finite dimensions that optimizes the local buckling coefficient is given for various eccentricities of end load. The post-local buckling of a longitudinally stiffened plate in uniform compression and pure bending is also considered. It is shown that the provision of a longitudinal stiffener, of proportions to enforce a node at the plate–stiffener junction, enhances significantly the postbuckling response of the plate with regard to the serviceability limit state, particularly for the case of pure bending. Key words: bending, compression, finite strips, local buckling, plates, postbuckling, stiffeners, webs.

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Mukherjee, Kenneth Sunil, and Tetsuya Yao. "Buckling/Elastoplastic Collapse Behavior and Strength of Continuous Tee-Bar Stiffened Plates." Journal of Offshore Mechanics and Arctic Engineering 128, no. 2 (2005): 145–55. http://dx.doi.org/10.1115/1.2185131.

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The influence of residual stress distributions should be properly taken into account in the structural analysis of stiffened plates. The generally assumed residual stress distributions in the analyses often have constant values across their cross sections. This approximation is also applied to identical stiffeners that are constructed by different methods, such as rolled and built-up tee-bar stiffened plates. This paper focuses on buckling/plastic collapse behavior of rolled and built-up tee-bar stiffened plates with experimentally determined residual stress distributions in their cross sections. The structural behavior until collapse of these two types of tee-bar stiffeners is analyzed in detail, using residual stresses measured from experimental results. Various numerical modelling aspects of stiffened plated structures are briefly discussed and finally the influence of differences in residual stress distributions on buckling/plastic collapse behavior of continuous stiffened plates is studied based on selected results, using the Finite Element Method.

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Troina, Grégori, Marcelo Cunha, Vinícius Pinto, et al. "Computational Modeling and Constructal Design Theory Applied to the Geometric Optimization of Thin Steel Plates with Stiffeners Subjected to Uniform Transverse Load." Metals 10, no. 2 (2020): 220. http://dx.doi.org/10.3390/met10020220.

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Stiffened thin steel plates are structures widely employed in aeronautical, civil, naval, and offshore engineering. Considering a practical application where a transverse uniform load acts on a simply supported stiffened steel plate, an approach associating computational modeling, Constructal Design method, and Exhaustive Search technique was employed aiming to minimize the central deflections of these plates. To do so, a non-stiffened plate was adopted as reference from which all studied stiffened plate’s geometries were originated by the transformation of a certain amount of steel of its thickness into longitudinal and transverse stiffeners. Different values for the stiffeners volume fraction (φ) were analyzed, representing the ratio between the volume of the stiffeners’ material and the total volume of the reference plate. Besides, the number of longitudinal (Nls) and transverse (Nts) stiffeners and the aspect ratio of stiffeners shape (hs/ts, being hs and ts, respectively, the height and thickness of stiffeners) were considered as degrees of freedom. The optimized plates were determined for all studied φ values and showed a deflection reduction of over 90% in comparison with the reference plate. Lastly, the influence of the φ parameter regarding the optimized plates was evaluated defining a configuration with the best structural performance among all analyzed cases.

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Dong, Chang Chun, and Wei Zhao. "Test Analysis of Stiffened T-Stub Connections." Applied Mechanics and Materials 744-746 (March 2015): 319–22. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.319.

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To investigate the effect of stiffener on the stiffness and strength of T-stubs, 3 T-stub connections without stiffeners and 6 stiffened T-stub connections with varied shape and thickness of stiffeners were tested monotonically. The load carrying capacity, relative deformations of endplates and strains on the stiffeners and endplates were measured. The load-deformation curves of the connections and load-strain curves were presented. The test results showed that the commonly used stiffeners in current Chinese practice often yield or/and buckle prematurely. And the stiffener designed by the method can meet the requirement in CECS102-2002, which demands that the stiffener should be able to force the extended portion of endplates from clamped-free boundary to plates fixed on two adjacent boundaries.

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Dissertations / Theses on the topic "Stiffened plates"

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Sheikh, Imtiaz Ali. "Stiffener tripping in stiffened steel plates." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60496.pdf.

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Bellur, Ramaswamy Ravi Shankar. "Optimal design of stiffened plates." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0017/MQ45871.pdf.

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Hildrum, Hilde Giæver. "Stiffened Aluminium Plates Subjected to Impact Loading." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-130.

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<p>An experimental investigation has been carried out to study the behaviour of stiffened aluminium plates subjected to large mass (55 kg) projectiles in the low velocity regime. The stiffened aluminium plates were fabricated from aluminium alloy AA6082 temper T6 extrusions MIG-welded together to form flat stiffened plates. The study was made on the variation of failure mode and the energy-absorbing capacity with various combinations of projectile nose shape (blunt and hemispherical) and load application point (between two stiffeners, on a stiffener and next to a stiffener).</p><p>The estimated incipient fracture velocity (giving cracks in the target) was significant less for the hemispherical ended nose than the blunt ended nose. The impact between the stiffeners gave lowest incipient fracture velocity followed by impact next to the stiffener and impact on a stiffener in that order. The estimated ballistic limit velocity was almost equal for impact between two stiffeners using both nose shapes and for impact next to a stiffener with the blunt ended projectile. The hemispherical ended projectile impacting next to a stiffener lead to significant higher ballistic limit.</p><p>The observed differences in the ballistic limit velocity and incipient fracture velocity were mainly attributed to the change in failure mode (and energy absorption). The blunt projectile caused failure by plugging, while petaling fracture modes were observed for impact with a hemispherical ended projectile.</p><p>In addition to impact tests, static punch tests were carries out to study any possible relationships between the dynamic and quasi-static capacity before fracture occurs. In the studied velocity range and for the blunt ended projectile, it seems that the static tests may give a conservative estimate of the incipient fracture impact energy. For the hemispherical ended projectile this method may lead to non-conservative results.</p><p>A metallurgical examination of cross sections of the target at the impact point was carried out to reveal details of internal changes of configuration such as deformations and changes of microstructure, and the generation of fractures. The fracture was initiated on the rear side impacting next to a stiffener or between the stiffeners (on the weld) with both nose shapes. Ductile fracture was observed in all test specimens except for fracture in the welds. No evidence of temperature effects and no pronounced shear localisation through the thickness of the plate where seen.</p><p>Numerical simulation of perforation of a stiffened plate impacted with a hemispherical ended projectile between two stiffeners (on the weld) has been performed using the non-linear finite element code LS-DYNA. Inverse modelling of tensile test specimens was performed to identify the material parameters. The weld and heat affected were modelled with reduced strength compared to the parent material. The main objective with these numerical simulations was to study whether the Lemaitre damage material model could predict the response of the impacted plate when taking failure into account. The numerical simulation described the maximum force quite well. Furthermore, the model predicts the instability phenomenon and fracture process as observed in the experiments reasonably well. </p>

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Lim, B. S. "Buckling behaviour of asymmetric edge stiffened plates." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371363.

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Farsi, Maryam. "Localized and cellular buckling in stiffened plates." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24998.

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Nonlinear buckling behaviour of a thin-walled simply-supported stiffened panel that has uniformly spaced longitudinal stiffeners is studied. The structure is made from a linear elastic, isotropic and homogeneous material. The panel is subjected to pure compression applied at the centroid of whole cross-section. In such structures, the nonlinear interaction can occur between a global (Euler) buckling and local plate ( i.e. the stiffener or the main plate) buckling modes. The interactive buckling behaviour is usually more unstable than when the modes are triggered individually. This can lead to a significant reduction of the load-carrying capacity. The current work focuses on the case where the stiffening is only on one side of the main plate. An analytical model of a perfect thin-walled stiffened plate is formulated based on variational principles by minimizing the total potential energy. The equations of equilibrium are then solved numerically using the continuation and bifurcation software Auto to determine the post-buckling behaviour. Cellular buckling (or snaking) is revealed analytically in such a component arising from nonlinear local global interactive buckling, perhaps for the first time. In addition, the effect of varying the rigidity at the main plate -stiffener junction is studied; a rapid erosion of the cellular buckling response is revealed by increasing the joint rigidity. The initial model is then developed by including more degrees of freedom within the stiffened panel and the introduction of global and local imperfections. The results from the analytical model are validated by the finite element (FE) method using the commercial software Abaqus as well as by comparing against some experimental results taken from the literature. To obtain a greater understanding of the drivers of the structural behaviour, parametric studies are conducted for a variety of different plate and stiffener geometries as well as an investigation into the heightened sensitivity to geometric imperfections. The worst forms of local imperfection are identified in terms of the initial amplitude, number of waves and the degree of localization. The imperfection sensitivity and the parametric studies are conducted for two limiting cases, where the main plate- stiffener joint is assumed to be fully pinned or fully rigid. A framework for establishing the zone where structural designers need to consider mode interaction carefully is presented.

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Afifi, Amal Afifi Mohamed. "Buckling of stiffened pultruded GRP plates and columns." Thesis, Lancaster University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497222.

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The research work presented in this thesis is focused or investigating the buckling behaviour of wide range pultruded structural GRP profiles. Investigations of both global and local buckling of GRP profiles have been carried out to determine the buckling capacities. An investigation on improving the buckling capacity of plates and columns was carried out. The program of research undertaken to enhance column buckling capacity included analytical and finite element modelling of the buckling of GRP plates and columns and experimental work on the buckling of GRP columns.

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Bardell, N. S. "Wave propagation in periodically stiffened plates and shells." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256281.

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8

Dwire, Heather B. "RISK BASED ANALYSIS AND DESIGN OF STIFFENED PLATES." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1208453129.

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Ozdamar, Huseyin Hasan. "A Stiffened Dkt Shell Element." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12605741/index.pdf.

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A stiffened DKT shell element is formulated for the linear static analysis of stiffened plates and shells. Three-noded triangular shell elements and two-noded beam elements with 18 and 12 degrees of freedom are used respectively in the formulation. The stiffeners follow the nodal lines of the shell element. Eccentricity of the stiffener is taken into account. The dynamic and stability characteristic of the element is also investigated. With the developed computer program, the results obtained by the proposed element agrees fairly well with the existing literature.

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Sawicki, Adam John. "Damage tolerance of integrally stiffened composite plates and cylinders." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13615.

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Books on the topic "Stiffened plates"

1

Ramaswamy, Ravi Shankar Bellur. Optimal design of stiffened plates. National Library of Canada, 1999.

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2

Danielson, D. A. Analytical tripping loads for stiffened plates. Naval Postgraduate School, 1994.

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Danielson, D. A. Tripping of stiffened plates using a refined beam theory. Naval Postgraduate School, 1988.

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4

Nast, Trina E. Cyclic behavior of stiffened gusset plate-brace member assemblies. Dept. of Civil and Environmental Engineering, University of Alberta, 1999.

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5

Rajagopalan, K. Finite element buckling analysis of stiffened cylindrical shells. A.A. Balkema, 1993.

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6

Stredulinsky, David C. Finite element modelling of the vibration of stiffened flat plates in air. National Defence, Research and Development Branch, 1992.

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7

Simitses, George J. Buckling of delaminated long panels under pressure and of radially-loaded stiffened annular plates. Georgia Institute of Technology, 1985.

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8

Gürdal, Zafer. [Optimum design of geodesically stiffened composite plates]: Progress report for the research performed under NASA research grant NAG-1-643. National Aeronautics and Space Administration, 1988.

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9

Bracco, Mark Douglas. A study of the wedge cutting force through longitudinally stiffened plates: An application to grounding resistance of single and double hull ships. Available from National Technical Information Service, 1994.

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Xiang, Y. Plate vibration with arbitrarily oriented stiffeners based on Mindlin-Engesser formulation. Department of Civil Engineering, University of Queensland, 1993.

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Book chapters on the topic "Stiffened plates"

1

Farkas, József, and Károly Jármai. "Stiffened Plates." In Optimum Design of Steel Structures. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36868-4_7.

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2

Harik, I. E., and B. F. Haddad. "Stiffened and Continuous Annular Sector Plates." In Computational Mechanics ’86. Springer Japan, 1986. http://dx.doi.org/10.1007/978-4-431-68042-0_20.

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Zhang, K., and T. R. Lin. "Sound Transmission of Beam-Stiffened Thick Plates." In Vibration Engineering for a Sustainable Future. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-48153-7_38.

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Sridharan, Srinivasan. "Stiffened Plates and Cylindrical Shells under Interactive Buckling." In Trends in Structural Mechanics. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5476-5_16.

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Srivastava, A. K. L. "Vibration and Dynamic Stability of Stiffened Plates with Cutout." In Advances in Structural Engineering. Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2190-6_9.

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Ning, Jian Guo, Wei Dong Song, Cheng Wang, and Jing Wang. "Impact Perforation of Stiffened Steel Plates by Rigid Projectiles." In Fracture and Strength of Solids VI. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.303.

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Liu, Kun, Li Ke, and Jiaxia Wang. "Response of steel stiffened plates under shock wave loadings." In Developments in Maritime Technology and Engineering. CRC Press, 2021. http://dx.doi.org/10.1201/9781003216582-54.

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Shimizu, S., S. Horii, and S. Yoshida. "Behaviour of Stiffened Web Plates Subjected to the Patch Load." In Contact Loading and Local Effects in Thin-walled Plated and Shell Structures. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-02822-3_23.

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Ghavami, K. "The Collapse of Continuously Welded Stiffened Plates Subjected to Uniaxial Compression Load." In Inelastic Behaviour of Plates and Shells. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82776-1_20.

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Shabeeb, T., N. Swaminathan, and R. Annabattula. "Geometric and material nonlinear design of stiffened plates for APC equipment." In Insights and Innovations in Structural Engineering, Mechanics and Computation. CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-142.

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Conference papers on the topic "Stiffened plates"

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Alali, Amier, Yehia Abdel-Nasser, and Swielm A. Swielm. "Collision Analysis of Stiffened Plates." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20612.

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Structural design of ships against collision requires prediction of the extent of damage to stiffened plates subjected to impact. Structural components such as stiffened plates, bulkheads are our concern. In ship structures stiffened plates are furnished with vertical or horizontal stiffeners to sustain conventional acting loads such as shearing, bending and local buckling. The consideration of collision in ship structural design is necessary for tankers where accidents may cause serious environmental pollution. In predicting the extent of collision damage, finite elements (FE) modeling of stiffened plates using ABAQUS software is applied to demonstrate collision scenario. Typical stiffened plates of tanker in service with different configurations of stiffeners are selected to examine absorbed energy for each one. The aim of this paper is to select the proper stiffener shape absorbing more deformed energy. These analyses of stiffened plates will guide ship designers to properly select effective stiffener absorbing higher deformed energy when simulate full scale ship against collision.

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2

Ren, Huilong, Yifu Liu, Chenfeng Li, Xin Zhang, and Zhaonian Wu. "Numerical Investigation of Ultimate Strength of Stiffened Plates With Various Cross-Section Forms." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77756.

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There is an increasing interest in the lightweight design of ship and offshore structures, more specifically, choosing aluminum alloys or other lightweight high-performance materials to build structure components and ship equipments. Due to its better mechanical properties and easy assembly nature, extruded aluminum alloy stiffened plates are widely used in hull structures. When the load on the hull reaches a certain level during sailing, partial or overall instability of stiffened plate makes significant contribution in an event of collapse of the hull structure. It is very necessary to investigate the ultimate strength of aluminum alloy stiffened plate to ensure the ultimate bearing capacity of large aluminum alloy hull structure. Most of studies of the ultimate strength of stiffened plates deal with stiffened plates with T–shaped stiffeners. Stiffeners of other shapes have seldom been explored. In this research, the ultimate strength of six different cross–section aluminum alloy stiffened plates and one steel stiffened plate was studied based on the non–linear finite element analysis (FEA). Taking into account stiffness, weight and other issues, the new cross–section aluminum stiffener has finally been concluded for replacing the original steel stiffener in upper deck of a warship.

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3

Liu, Yucheng, and Qingkui Wang. "Modeling and Simulation of Performance of Stiffened Plates During Strength Analysis." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85122.

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This paper performs strength analysis on arbitrarily stiffened and regular stiffened plates to investigate the strengthening effects of stiffener’s height, number, and arrangement on the stiffened plates’ ultimate strength limit (USL). It is also found that the strengthening effects of an arbitrarily oriented stiffener (or oblique stiffener) can be decoupled to two perpendicular regular stiffeners which are located in appropriate positions. Nonlinear buckling analyses were performed on the arbitrarily stiffened plates with one and two arbitrarily oriented stiffeners to verify this finding. The outcome of this paper can be further extended and applied to develop simplified semi-analytical models for buckling strength analysis of constructional plates.

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Yuceoglu, Umur, Jaber Javanshir, and O¨zen Guvendik. "On a General Approach to Free Vibrations Response of Integrally-Stiffened and/or Stepped-Thickness Rectangular Plates or Panels." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66980.

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This study is mainly concerned with a “General Approach” to the “Theoretical Analysis and the Solution of the Free Vibrations Response of Integrally-Stiffened and/or Stepped-Thickness Plates or Panels with Two or more Integral Plate Stiffeners”. In general, the “Stiffened System” (regardless of the number of “Plate Stiffeners”) is considered to be composed of dissimilar “Orthotropic Mindlin Plates” with unequal thicknesses. The dynamic governing equations of the individual plate elements of the “System” and the stress resultant-displacement expressions are combined and algebraically manipulated. These operations lead to a new “Governing System of the First Order Ordinary Differential Equations” in “state vector” forms. The new “Governing System of Equations” facilitates the direct application of the present method of solution, namely, the “Modified Transfer Matrix Method (MTMM) (with Interpolation Polynomials)”. As shown in the present study, the “MTMM” is sufficiently general to handle the “Free Vibrations Response” of the “Stiffened System” (with, at least, one or up to three or four “Integral Plate Stiffeners”). The present analysis and the method of solution are applied to the typical “Stiffened Plate or Panel System with Two Integral Plate Stiffeners”. The mode shapes with their natural frequencies are presented for the “Isotropic Al-Alloy” and “Orthotropic Composite” cases and for several sets of support conditions. As an additional example, the case of the “Stiffened Plate or Panel System with Three Integral Plate Stiffeners” is also considered and is shown in terms of the mode shapes and their natural frequencies for one set of the boundary conditions. Also, some parametric studies of the natural frequencies versus the “Stiffener Thickness Ratio” and the “Stiffener Length (or Width) Ratio” are investigated and are graphically presented.

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Khedmati, Mohammad Reza, and Mehran Rastani. "Nonlinear Elastoplastic Behaviour of Intermittently Welded Stiffened Plates Under Inplane Compression." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92603.

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The objective of this study is to investigate the sensitivity of the ultimate strength and failure mechanism of stiffened plates constructed by different welding methods in common. A series of detailed numerical analyses of longitudinally stiffened steel plates subjected to inplane compressive load are performed using ADINA commercial finite element code. Complete equilibrium paths are traced up to collapse for nonlinear elastoplastic response of stiffened plates. Stiffened plates analysed are imperfect and their aspect ratio, plate slenderness and column slenderness are changed in a systematic manner. Different types of stiffener are chosen for stiffened plate models. Three different stiffener-to-plate welding procedures are considered: continuous, chain intermittent and staggered intermittent fillet welding.

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Shih, Hui-Ru, and Roger C. Duffield. "Analysis of Stiffened Plates Using the Boundary Element and Finite Element Hybrid Method." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0101.

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Abstract The boundary element and finite element hybrid method, based on a combination of unstiffened plate boundary element method and stiffener finite elements, is employed for static analysis of concentrically stiffened plates subjected to transverse loading. The integral equation formulation and its boundary element solution procedures for bending of a unstiffened plate are briefly reviewed. The algorithm which permits coupling of the unstiffened plate boundary elements with the beam (stiffener) finite elements is presented. The numerical implementations of the equilibrium and compatibility conditions along the interface between the plate and its stiffener are given in detail. Numerical examples illustrate the accuracy as well as the capability of the proposed method to determine the solution of stiffened plate bending problems.

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Alanbay, Berkan, Karanpreet Singh, and Rakesh K. Kapania. "Vibration of Curvilinearly Stiffened Plates Using Ritz Method With Orthogonal Jacobi Polynomials." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86871.

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This paper presents a general approach for the free vibration analysis of curvilinearly stiffened rectangular and quadrilateral plates using Ritz method employing classical orthogonal Jacobi polynomials. Both the plate and stiffeners are modeled using first-order shear deformation theory (FSDT). The displacement and rotations of the plate and a stiffener are approximated by separate sets of Jacobi polynomials. The ease of modification of the Jacobi polynomials enables the Jacobi weight function to satisfy geometric boundary conditions without loss of orthogonality. The distinctive advantage of Jacobi polynomials, over other polynomial-based trial functions, lies in that their use eliminates the well-known ill-conditioning issues when a high number of terms are used in the Ritz method; e.g., to obtain higher modes required for vibro-acoustic analysis. In this paper, numerous case studies are undertaken by considering various sets of boundary conditions. The results are verified both with the detailed Finite Element Analysis (FEA) using commercial software MSC.NASTRAN and for some cases, and with those available in the open literature for others. Convergence studies are presented for studying the effect of the number of terms used on the accuracy of the solution. The paper also discusses the effects of stiffener and plate geometric dimensions on the dynamic characteristics of the structure. The method also has an advantage of saving significant computational time during optimization of such structures as changing the placement and shape of stiffeners does not require repeated calculation of plate mass and stiffness matrices as the stiffener shapes are changed.

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Lotsberg, Inge, and Harald Rove. "Stress Concentration Factors for Butt Welds in Plated Structures." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23316.

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Geometric stress concentration factors for butt welds in stiffened plates have been investigated by finite element analysis. The purpose of these analyses has been to establish a data basis that can be used to develop an analytical expression for stress concentration factors (SCF) for butt welds in stiffened plates. The geometry investigated is that typical used in stiffened plates in floating production vessels and ships. The geometry is also considered to be in the relevant range for semisubmersibles. Stress concentration factors are derived at the butt weld in the midway between the longitudinal stiffeners and at butt welds in way of cope holes of the longitudinal stiffener. Based on the performed work an equation accounting for eccentricity of plates due to fabrication tolerances and difference in thickness is derived that also has been included in the DNV Recommended Practice for fatigue analysis.

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Jiang, Wei, Ping Yang, and Ziya Peng. "Experimental Study on Crack Propagation and Strain Accumulation of Cracked Stiffened Plate Under Cyclic Load." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78596.

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Stiffened plates with cracked damage are often subjected to constant amplitude and/or variable amplitude cyclic loads in sea environment. Under the stress-controlled asymmetric low-cycle fatigue loads, the coupling effect of low-cycle fatigue crack propagation and accumulative plasticity contributes to the increase of accumulative mean strain of cracked structures. Low-cycle fatigue crack growth and the increase of whole strain of cracked structures will change the bearing capacity of cracked structures. In this paper, experimental study on crack propagation and strain accumulation of cracked stiffened plate under low cycle fatigue load has been conducted. AH32 steel is used to make stiffened plate specimen with crack symmetrically located about stiffener. The accumulative strain of the cracked stiffened plate specimens during low-cycle fatigue crack propagation was obtained. From the experiments for cracked stiffened plates under the low-cycle fatigue loading, it is found out that the crack propagates firstly in the weld and then also gradually takes place in the stiffener. The stress ratio of low-cycle fatigue load and stiffener stiffness have been investigated in the experimental study and it is found out that these parameters significantly affect the low-cycle fatigue crack growth life and accumulation strain of the cracked stiffened plate specimens.

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Ahmadian, M. T., T. Pirbodaghi, and M. Pak. "Natural Frequencies of Stiffenened and Unstiffened Laminated Composite Plates." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42801.

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In this study, the free vibration of laminated composite plates with and without stiffeners subjected to axial loads is carried out using finite element method. The plates are stiffened by laminated composite strip and Timoshenko beam. The plates and the strips are modeled with rectangular 9 noded isoparametric quadratic elements with three degrees of freedom per node and the Timoshenko beam is modeled with linear 2 noded isoparametric quadratic elements with 2 degrees of freedom per node. The effects of both shear deformation and rotary inertia are implemented in the modeling of plate and stiffener. The governing differential equations are obtained in terms of the mid-plane displacement components and shear rotations using Hamilton’s principle. The effects of axial tension and compression loads and stiffeners on the natural frequencies of the plate are investigated. Results indicate the tension loads and stiffeners will increase the natural frequencies while the compression loads reduce the natural frequencies. The buckling force of plate is computed by increasing the absolute value of compressive force until the first natural frequency tends to zero. Results of simple cases are compared with finding in the literature and a good agreement was achieved.

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Reports on the topic "Stiffened plates"

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R.L. Campbell and S.A. Hambric. Effects of Equipment Loading on the Vibrations of Edge-Stiffened Plates and Associated Modeling Issues. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/822283.

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Hao, Rui, Yuqing Liu, and Haohui Xin. EXPERIMENTAL STUDY ON BEARING CAPACITY OF Q420 STEEL U-RIB STIFFENED PLATES SUBJECTED TO AXIAL COMPRESSION. The Hong Kong Institute of Steel Construction, 2018. http://dx.doi.org/10.18057/icass2018.p.081.

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Thornell, Travis, Charles Weiss, Sarah Williams, et al. Magnetorheological composite materials (MRCMs) for instant and adaptable structural control. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/38721.

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Magnetic responsive materials can be used in a variety of applications. For structural applications, the ability to create tunable moduli from relatively soft materials with applied electromagnetic stimuli can be advantageous for light-weight protection. This study investigated magnetorheological composite materials involving carbonyl iron particles (CIP) embedded into two different systems. The first material system was a model cementitious system of CIP and kaolinite clay dispersed in mineral oil. The magnetorheological behaviors were investigated by using parallel plates with an attached magnetic accessory to evaluate deformations up to 1 T. The yield stress of these slurries was measured by using rotational and oscillatory experiments and was found to be controllable based on CIP loading and magnetic field strength with yield stresses ranging from 10 to 104 Pa. The second material system utilized a polystyrene-butadiene rubber solvent-cast films with CIP embedded. The flexible matrix can stiffen and become rigid when an external field is applied. For CIP loadings of 8% and 17% vol %, the storage modulus response for each loading stiffened by 22% and 74%, respectively.

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Connor, Robert J., and Cem Korkmaz. Fatigue Categorization of Obliquely Oriented Welded Attachments. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317210.

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In current bridge design specifications and evaluation manuals from the American Association of State Highway and Transportation Officials (AASHTO LRFD) (AASHTO, 2018), the detail category for base metal at the toe of transverse stiffener-to-flange fillet welds and transverse stiffener-to-web fillet welds to the direction of the web and hence, the primary stress) is Category C′. In skewed bridges or various other applications, there is sometimes a need to place the stiffener or a connection plate at an angle that is not at 90 degrees to the web. As the plate is rotated away from being 90 degrees to the web, the effective “length” of the stiffener in the longitudinal direction increases. However, AASHTO is currently silent on how to address the possible effects on fatigue performance for other angles in between these two extremes. This report summarizes an FEA study that was conducted in order to investigate and determine the fatigue category for welded attachments that are placed at angles other than 0 or 90 degrees for various stiffener geometries and thicknesses. Recommendations on how to incorporate the results into the AASHTO LRFD Bridge Design Specifications are included in this report.

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Yang, Ziye, Hongzhou Deng, Chao Li, and Xing Ma. STRENGTH OF MULTIPLANAR LONGITUDINAL PLATE-TO-CIRCULAR HOLLOW SECTION (CHS) CONNECTIONS REINFORCED BY EXTERNAL RING STIFFENERS. The Hong Kong Institute of Steel Construction, 2018. http://dx.doi.org/10.18057/icass2018.p.104.

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