Academic literature on the topic 'Materials Buckling (Mechanics)'

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Journal articles on the topic "Materials Buckling (Mechanics)"

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KAN, KEVIN H. M., and EMILY D. CRANSTON. "Mechanical testing of thin film nanocellulose composites using buckling mechanics." TAPPI Journal 12, no. 4 (May 1, 2013): 9–17. http://dx.doi.org/10.32964/tj12.4.9.

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The Young’s modulus of multilayer films containing cellulose nanocrystals (CNCs) and polyethyleneimine (PEI) was measured using a buckling-based method and compared to analogous films containing nanofibrillated cellulose (NFC) and PEI [1]. For films 61 nm to 1.7 μm thick, the Young’s modulus was constant but strongly dependent on relative humidity. Films were stiffer at lower relative humidities, with modulus values of 16 ± 5, 12 ± 1, and 3.5 ± 0.3 GPa at 30%, 42%, and 64% relative humidities, respectively. CNC/PEI films had larger elastic moduli than NFC/PEI films. Both types of nanocellulose multilayer films showed the same modulus dependence on relative humidity over the range studied. Results suggest that ambient water might have an even more pronounced role in nanocomposites than in traditional natural fiber-reinforced composites. This straightforward buckling-based method has quantified mechanical properties and provided a useful comparison between CNC and NFC films. Furthermore, it qualitatively assesses that the components in the composite film are highly compatible and that the hydrophilicity and hygroscopicity of cellulose and PEI combined do not allow for the full mechanical potential of crystalline cellulose nanoelements to be exploited. This work is one approach toward finding dependable methods to characterize nanocellulose, specifically cellulosic thin films, which is increasingly important as we extract nanocellulose from wood, plants, algae, bacteria, and animals and enter a new age of cellulose materials.
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Becque, Jurgen. "Inelastic Plate Buckling." Journal of Engineering Mechanics 136, no. 9 (September 2010): 1123–30. http://dx.doi.org/10.1061/(asce)em.1943-7889.0000075.

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Ben Ammar, I., A. El Mahi, C. Karra, R. El Guerjouma, and M. Haddar. "Mechanical behaviour and damage evaluation by acoustic emission of composite materials." Multidiscipline Modeling in Materials and Structures 9, no. 1 (June 21, 2013): 100–115. http://dx.doi.org/10.1108/15736101311329188.

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PurposeThe aim of the present study is to investigate the mechanical behaviour of cross‐ply laminates under static tensile and buckling loading. Different cross‐ply laminates constituting of carbon fibers (CFRP), hybrid fibers (HFRP) and glass fibers (GFRP) in an epoxy matrix were considered. This work is also interested in identifying and characterizing the local damage in the composites with the use of acoustic emission method (AE).Design/methodology/approachThe cross‐ply laminates are differentiated by the stacking sequences, thickness of 90° oriented layers and reinforcement. They are subjected to the static tensile and buckling load. The damage investigation is reached by the analysis of acoustic emission signals collected from static buckling tests.FindingsThe results show the effects of reinforcement type, stacking sequences and thicknesses ratio of 90° and 0° layers on the stiffness, failure load and displacement. A cluster analysis of acoustic emission data is achieved and the results are correlated to the damage mechanism of specimens under buckling tests.Originality/valueThe analysis of acoustic emission signals collected from static buckling tests under loading levels of 40, 60 and 100 per cent of the static failure load allows the damage investigation in cross‐ply laminates.
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Sun, Yueting, Yibing Li, Cang Zhao, Meng Wang, Weiyi Lu, and Yu Qiao. "Crushing of circular steel tubes filled with nanoporous-materials-functionalized liquid." International Journal of Damage Mechanics 27, no. 3 (December 12, 2016): 439–50. http://dx.doi.org/10.1177/1056789516683539.

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The crush behaviors of steel tubes filled with nanoporous-materials-functionalized liquids are experimentally investigated under quasi-static and dynamic conditions. Results show that the nanoporous-materials-functionalized liquid can enhance the load-carrying and the energy absorption capacities of thin-walled tubes, as the buckling mode is affected. The effective buckling stress increases with the infiltration pressure, and the overall compressibility is highly dependent on the nanopore volume. A general rule of designing nanoporous-materials-functionalized liquid-filled tubes is proposed. The interaction between the tube wall and the nanoporous-materials-functionalized liquid is analyzed.
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Pandey, Mahesh D., and Archibald N. Sherbourne. "Mechanics of Shape Optimization in Plate Buckling." Journal of Engineering Mechanics 118, no. 6 (June 1992): 1249–66. http://dx.doi.org/10.1061/(asce)0733-9399(1992)118:6(1249).

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Iguiñiz, Nestor, Riccardo Frisenda, Rudolf Bratschitsch, and Andres Castellanos-Gomez. "Buckling 2D Materials: Revisiting the Buckling Metrology Method to Determine the Young's Modulus of 2D Materials (Adv. Mater. 10/2019)." Advanced Materials 31, no. 10 (March 2019): 1970074. http://dx.doi.org/10.1002/adma.201970074.

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Spencer, Herbert H., and Herli Surjanhata. "On Plate Buckling Coefficients." Journal of Engineering Mechanics 112, no. 3 (March 1986): 249–59. http://dx.doi.org/10.1061/(asce)0733-9399(1986)112:3(249).

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Kang, Huairong, Pengfei He, Cunman Zhang, Ying Dai, Zhongde Shan, Yong Zang, and Hong Lv. "Tensile progressive damage and compressive postbuckling analysis of open-hole laminate composites." Journal of Reinforced Plastics and Composites 39, no. 17-18 (June 28, 2020): 637–53. http://dx.doi.org/10.1177/0731684420920355.

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Laminate composites contain holes as a means of connection in industrial applications. A better understanding of the mechanical properties of open-hole components is necessary. Herein, progressive damage postbuckling analysis models are proposed for investigation of tensile damage and compressive buckling behaviors of open-hole laminate composites. The progressive damage model is based on failure criteria provided by the continuum damage mechanics model; virtual crack closure technology was employed to calculate the energy release rate for crack delamination in compressive postbuckling analysis. The models were utilized to analyze variations in the tensile and compressive mechanical properties, failure process, and buckling evolution of open-hole laminate composites using finite element analysis. The tensile failure patterns and failure processes of plies with different open-hole laminate composite angles were obtained and analyzed. Buckling characteristics, as well as the progression of buckling onset, buckling propagation, crack delamination, unstable delamination, and global buckling, were investigated. The influence of delamination crack length and crack distribution on the buckling properties of open-hole laminate composites are discussed in detail. Additionally, unstable and stable buckling characteristics were examined. The numerical results were in good agreement with theoretical and experimental results; damage initiated at the edge of a hole propagated to two sides with the onset of matrix damage, followed by fiber damage. The fiber damage of a 0°-ply led ultimately to laminate failure. The laminate with a symmetrical crack distribution showed stable buckling, whereas a short, nonsymmetrical distribution of cracks usually led to unstable buckling and delamination.
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Chang-jun, Cheng, and Lui Xiao-an. "Buckling and post-buckling of annular plates in shearing, Part I: Buckling." Computer Methods in Applied Mechanics and Engineering 92, no. 2 (November 1991): 157–72. http://dx.doi.org/10.1016/0045-7825(91)90237-z.

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Hu, Jianying, Yu Zhou, and Zishun Liu. "The Friction Effect on Buckling Behavior of Cellular Structures Under Axial Load." International Journal of Applied Mechanics 10, no. 02 (March 2018): 1850013. http://dx.doi.org/10.1142/s1758825118500138.

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When soft cellular structures are compressed axially beyond critical limits, elastic instabilities induce buckling behavior. Although the nonlinear response of periodic materials with different shape voids has been widely investigated, the effect of the friction on the structural response has not yet been explored. In this paper, we develop a simple theoretical model for the buckling of holey column with holes. Meanwhile, we also numerically and experimentally explore the effect of friction on the buckling behavior of the cellular structures. We find out that friction could prevent conventional, global Euler buckling for holey column, which tends to choose the pattern switching mode, and our study also provides future perspectives for mechanics of buckling or optimal design for the cellular structures.
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Dissertations / Theses on the topic "Materials Buckling (Mechanics)"

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Alur, Kashyap. "Nonlinear mechanics of composite materials." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53600.

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Composite materials have been an area of active research in recent years due to the possibility of obtaining multifunctional structures. Viscoelastic layered composites with parallel plane layers consisting of a stiff constituent and a soft viscoelastic constituent are of particular interest as they have been shown to exhibit simultaneous high stiffness and high damping. Such materials would be useful in structural applications and in high vibration environments such as in a vehicle or machinery. They would provide the rigidity required while simultaneously dissipating mechanical energy. The finite deformation mechanics of parallel plane viscoelastic layered composites has not been extensively studied. Under compressive loads they are very susceptible to instabilities. Buckling, for example is an elastic instability seen in load bearing materials. Since viscoelastic materials are rate and time dependent, the buckling modes for these composites not only depend on these factors, but also on the volume fraction of the stiff constituent. Three different cases are identified in the buckling and post-buckling response of these composites: non-dilute (high volume fraction), transition (intermediate volume fraction) and dilute (small volume fraction) cases. Due to buckling from the application of prestrain, the stiffness and damping of these composites can be tuned by orders of magnitude. Adaptive and multifunctional materials can be designed taking advantage of this idea and the rate dependence of the modes of deformation.
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Li, Hong. "Experimental micromechanics of composite buckling strength." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/11719.

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Yilmaz, Suphi. "Buckling Driven Delamination Of Orthotropic Functionally Graded Materials." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607836/index.pdf.

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In today'
s technology severe working conditions increase demands on structural materials. A class of materials which are developed to meet these increased demands is Functionally Graded Materials (FGMs). These are inhomogeneous structural materials which are able to withstand large temperature gradients and corrosive environment. Application areas of FGMs are in aerospace industry, nuclear reactors, chemical plants and turbine systems. FGMs have gradual compositional variation from metal to ceramic which give them mechanical strength, toughness and heat resistance. However under high temperature gradients, cracking problems may arise due to thermal stresses. In layered structures the final stage of failure may be delamination due to crack extension. The objective of this study is to model a particular type of crack problem in a layered structure consisting of a substrate, a bond coat and an orthotropic FGM coating. There is an internal crack in the orthotropic layer and it is perpendicular to material gradation of coating. The position of the crack inside the coating is kept as a variable. The steady-state temperature distribution between the substrate and the coating causes a buckled shape along crack face. The critical temperature change, temperature distribution, mixed mode stress intensity values and energy release rates are calculated by using Displacement Correlation Technique. Results of this study present the effects of geometric parameters such as crack length, crack position, etc as well as the effects of the type of gradation on buckling behavior and mixed mode stress intensity factors.
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Grall, Bruno. "Structural analysis of geodesically stiffened composite panels with variable stiffener distribution." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12232009-020522/.

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Singhatanadgid, Pairod. "Buckling of composite plates subjected to biaxial loading /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7067.

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Radloff, Harold David. "Buckling response of symmetrically laminated composite plates having a trapezoidal planform area." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06112009-063507/.

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Vakiener, Adam R. "Preliminary investigation of flange local buckling in pultruded wide flange structural shapes." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19562.

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Dávila, Carlos G. "Delamination initiation in postbuckled dropped-ply laminates /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134842/.

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Lo, Patrick Kar-Leung. "Comparison of theory and experiment for flexural-torsional buckling of laminated composite columns." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50051.

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Vlasov’s one-dimensional structural theory for thin-walled open section bars was originally developed and used for metallic elements. The theory was recently extended to laminated bars fabricated from advanced composite materials. The purpose of this research is to provide a study and assessment of the extended theory. The focus is on flexural and torsional-flexural buckling of thin-walled, open section, laminated composite columns. Buckling loads are computed from the theory using a linear bifurcation analysis, and are compared to available experimental data. Also, a geometrically nonlinear beam column analysis by the finite element method is developed from the theory. Results from the nonlinear compression response analysis are compared to limited available test data. The merits of the theory and its implementation are discussed.
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Huang, Haiying. "Single and multiple delamination behavior in composite plates." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/12541.

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Books on the topic "Materials Buckling (Mechanics)"

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Shama, Mohamed. Buckling of Ship Structures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Delamination buckling of composite materials. Dordrecht: Kluwer, 1988.

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Johann, Arbocz, and Weller T, eds. Buckling experiments: Experimental methods in buckling of thin-walled structures. Chichester: Wiley, 1998.

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Akbarov, Surkay. Stability Loss and Buckling Delamination: Three-Dimensional Linearized Approach for Elastic and Viscoelastic Composites. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Stein, Manuel. Postbuckling response of long thick plates loaded in compression including higher order transverse shearing effects. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Hyer, M. W. Innovative design of composite structures: The use of curvilinear fiber format to improve buckling resistance of composite plates with central circular holes. Blacksburg, VA: College of Engineering, Virginia Polytechnic Institute and State University, 1990.

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Hyer, M. W. Innovative design of composite structures: The use of curvilinear fiber format to improve buckling resistance of composite plates with central circular holes. Blacksburg, VA: College of Engineering, Virginia Polytechnic Institute and State University, 1990.

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Hyer, M. W. Innovative design of composite structures: Further studies in the use of a curvilinear fiber format to improve structural efficiency. Blacksburg, Va: College of Engineering, Virginia Polytechnic Institute and State University, 1988.

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Hyer, M. W. Innovative design of composite structures: Design, manufacturing, and testing of plates utilitzing [sic] curvilinear fiber trajectories : final report for NASA. Blacksburg, VA: College of Engineering, Virginia Polytechnic Institute and State University ; Hampton, VA, 1994.

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Hyer, M. W. Innovative design of composite structures: Axisymmetric deformations of unsymmetrically laminated cylinders loaded in axial compression : semiannual status report. Blacksburg, Va: College of Engineering, Virginia Polytechnic Institute and State University, 1990.

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Book chapters on the topic "Materials Buckling (Mechanics)"

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Bedford, Anthony, and Kenneth M. Liechti. "Buckling of Columns." In Mechanics of Materials, 729–81. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-22082-2_10.

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Gross, Dietmar, Wolfgang Ehlers, Peter Wriggers, Jörg Schröder, and Ralf Müller. "Buckling of Bars." In Mechanics of Materials – Formulas and Problems, 181–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53880-7_6.

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Chen, Youlong, Yilun Liu, and Xi Chen. "Helical Buckling Behaviors of the Nanowire/Substrate System." In Handbook of Nonlocal Continuum Mechanics for Materials and Structures, 241–87. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-58729-5_47.

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Chen, Youlong, Yilun Liu, and Xi Chen. "Helical Buckling Behaviors of the Nanowire/Substrate System." In Handbook of Nonlocal Continuum Mechanics for Materials and Structures, 1–47. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-22977-5_47-1.

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Yang, F. Q., Yan Li, B. L. Zheng, and K. Zhang. "Interaction Between Stress and Diffusion in Lithium-Ion Batteries: Analysis of Diffusion-Induced Buckling of Nanowires." In Handbook of Mechanics of Materials, 825–44. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-6884-3_59.

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Yang, F. Q., Y. Li, B. L. Zheng, and K. Zhang. "Interaction Between Stress and Diffusion in Lithium-Ion Batteries: Analysis of Diffusion-Induced Buckling of Nanowires." In Handbook of Mechanics of Materials, 1–20. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6855-3_59-1.

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Zhang, Tong-Yi, Bin Huang, and Ming-Hao Zhao. "The Phase Angle of an Interface Crack Induced by Indentation Delamination with Buckling." In IUTAM Symposium on Mechanical Behavior and Micro-Mechanics of Nanostructured Materials, 203–9. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-5624-6_20.

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Mao, W. G., and Y. C. Zhou. "Failure of Thermal Barrier Ceramic Coating Induced by Buckling Due to Temperature Gradient and Creep." In Macro-, Meso-, Micro- and Nano-Mechanics of Materials, 31–40. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-979-2.31.

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Martin, Katharina, Dennis Daub, Burkard Esser, Ali Gülhan, and Stefanie Reese. "Numerical Modelling of Fluid-Structure Interaction for Thermal Buckling in Hypersonic Flow." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 341–55. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_22.

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Abstract Experiments have shown that a high-enthalpy flow field might lead under certain mechanical constraints to buckling effects and plastic deformation. The panel buckling into the flow changes the flow field causing locally increased heating which in turn affects the panel deformation. The temperature increase due to aerothermal heating in the hypersonic flow causes the metallic panel to buckle into the flow. To investigate these phenomena numerically, a thermomechanical simulation of a fluid-structure interaction (FSI) model for thermal buckling is presented. The FSI simulation is set up in a staggered scheme and split into a thermal solid, a mechanical solid and a fluid computation. The structural solver Abaqus and the fluid solver TAU from the German Aerospace Center (DLR) are coupled within the FSI code ifls developed at the Institute of Aircraft Design and Lightweight Structures (IFL) at TU Braunschweig. The FSI setup focuses on the choice of an equilibrium iteration method, the time integration and the data transfer between grids. To model the complex material behaviour of the structure, a viscoplastic material model with linear isotropic hardening and thermal expansion including material parameters, which are nonlinearly dependent on temperature, is used.
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Wiggers, Sine Leergaard, and Pauli Pedersen. "Buckling Stresses, Material Nonlinearity, and Beam Modeling." In Springer Tracts in Mechanical Engineering, 95–104. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72721-9_11.

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Conference papers on the topic "Materials Buckling (Mechanics)"

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Ahmad, Mohd Ridzuan, Masahiro Nakajima, Seiji Kojima, Michio Homma, and Toshio Fukuda. "Buckling nanoneedle for characterizing single cells mechanics inside environmental SEM." In 2009 IEEE Nanotechnology Materials and Devices Conference (NMDC). IEEE, 2009. http://dx.doi.org/10.1109/nmdc.2009.5167555.

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Petrov, D., and A. Semenov. "Buckling of cylindrical shell panels in ANSYS." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2020): Proceeding of the 14th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0036813.

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Liu, Ning, and Wenbin Yu. "Buckling Analysis of Stiffened Panels Using Mechanics of Structure Genome." In 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-1137.

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Naguib, Hani E., and Mohamed Ali Emhmed Kshad. "Buckling behavior of origami unit cell facets under compressive loads." In Behavior and Mechanics of Multifunctional Materials and Composites XII, edited by Hani E. Naguib. SPIE, 2018. http://dx.doi.org/10.1117/12.2301246.

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Qu, Chengzhong, Qiang Guo, and Ling Lu. "Optimization Design of Stiffener for buckling in The Cylindrical Structure." In International Conference on Mechanics,Materials and Structural Engineering (ICMMSE 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmmse-16.2016.56.

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Burov, A. E., A. V. Shatov, and A. V. Lopatin. "Buckling analysis of anisogrid cylindrical shells under thermal loading." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2020): Proceeding of the 14th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0036645.

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Wang, Yong, Bin Jia, Jun Mo, and Peng-Yu Chen. "The Critical Buckling of Theoretical Analysis and Experiment of Steel Tube Reinforced with Prestressed Fiber." In 2016 International Conference on Mechanics and Materials Science (MMS2016). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813228177_0013.

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Han, Xiao-Dan, and Xin Zhao. "Integrated Optimal Design of Buckling-Restrained Braces for Tall Residential Building in High Seismicity Area." In 2016 International Conference on Mechanics and Materials Science (MMS2016). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813228177_0018.

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Ilstad, Ha˚var, Hroar A. Nes, and Geir Endal. "Strengthening Effect From Steel Pipe Cladding in Pure Bending." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92524.

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Clad steel pipelines consist of a typically 3 mm thick internal corrosion resistant alloy with metallurgical bonding to the outer carbon steel pipe. The method of clad pipe manufacture gives intrinsic rise to disbonded areas (defects) in between the two materials, and there is concern that such disbondment defects may trigger local buckling of the cladding when the pipe is subject to severe bending, e.g. when installed by the reeling method. This paper addresses the possibilities for local buckling of the cladding material with the steel pipe in pure bending. Disbonded areas are studied numerically, and the critical defect size regarding local buckling of the cladding is established and compared with the allowable defect size as defined in the manufacture specification. It is shown that allowable disbondment defects of 500 mm2 are only 1/20 of the necessary area for local buckling during installation by the reeling method. In traditional pipeline design, the possible strengthening effect from the cladding on a steel pipe is not taken into account. In this paper, the strengthening effect from the cladding with the pipe in pure bending is studied. For the pipeline analysed it is shown that the deformation controlled local buckling resistance of the clad steel pipe is at least equivalent to a full thickness carbon steel cross-section. Hence, for a clad steel pipeline installed by the reeling method, the required wall thickness can be calculated by assuming the total wall thickness to be solid carbon steel.
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Deegan, Dennis C., and Dennis K. Williams. "Materials, Fabrication, Installation, and Applied Mechanics Considerations in the Catastrophic Failure of a Flex Hose Bellows." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26769.

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This paper is the third in a series that describes the materials, fabrication, installation, and applied mechanics considerations surrounding the catastrophic failure of a bellows component within a metallic flexible hose. The subject flexible hose was utilized in a compressor piping system attachment juncture to a petro-chemical piping system designed in accordance with the ASME B31.3 Process Piping Code. Specifically, the ultimate failure mode issues related to the instability of the metal u-shaped bellows, from which the hose derives its overall flexibility and name, are reviewed and discussed in detail. In an effort to provide a comprehensive examination of the use of the flexible hose in the petrochemical industry, a discussion of the materials, fabrication methods, installation, and, applied mechanics associated with column buckling of the bellows (also known as “squirm”) are presented. A metallurgical failure analysis is presented to identify and document the mode of failure and metallurgical condition of the wire braid and bellows components of the hose. In addition, material examination results, including the discovery of inherent flaws from the fabrication process, are presented and the significance of the findings is presented. The selection process for this particular type of flexible hose (and bellows component) for eventual installation in a vibratory service environment is reviewed in light of the published recommendations provided by the rules of the Expansion Joint Manufacturers Association Standards (EJMA) with regard to squirm are also reviewed and discussed. Finally, a summary of the elastic-plastic finite element analysis of the u-shaped bellows is briefly described and compared against previously published theoretical works on the instability of shells of revolution and most specifically, toroids. The results of the theoretical, empirical, and analytical forensic investigations into the squirm phenomenon are utilized to identify some very practical recommendations in an effort to minimize the probability of catastrophic failures of u-shaped bellows from column type instability.
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Reports on the topic "Materials Buckling (Mechanics)"

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MECHANICAL BEHAVIOR AND CATENARY ACTION OF RESTRAINED STEEL BEAM UNDER FIRE. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.8.

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To investigate the mechanical behavior and catenary action of restrained steel beam under fire, experiments were performed on five H-section restrained steel beams exposed to ISO-834 standard fire. At first, mechanical property tensile tests were performed on 3 room-temperature specimens and 8 high-temperature specimens, and variation laws of the material properties of steel materials with temperature rising were investigated by the high-temperature steady-state tests. Through the fire experiments, the temperature data, mid-span deflections and failure modes of all specimens were obtained. The experimental results show that: (1) a restrained steel beam is prone to in-plane buckling failure under fire; (2) the loading ratio n and axial restraint stiffness Kx have great influences on the catenary action of restrained steel beam under fire; (3) when the loading ratio n is constant, the greater the axial restraint stiffness Kx, the later the catenary action occurs; when the axial restraint stiffness Kx is constant, the greater the loading ratio n, the earlier the catenary action occurs.
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