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首页> 外文期刊>Composite Structures >Effects Of Thickness And Transverse Shear Modulus Nonlinearityon The Post-'yield' And Post-localization Response Of An externally Pressurized Imperfect Cross-ply Ring
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Effects Of Thickness And Transverse Shear Modulus Nonlinearityon The Post-'yield' And Post-localization Response Of An externally Pressurized Imperfect Cross-ply Ring

机译：厚度和横向剪切模量非线性对外部加压不完全交叉叠层环的屈服后和定位后响应的影响

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摘要

The present investigation is concerned with the prediction of localization (onset of deformation softening) and post-localization and post-"yield" equilibrium paths for moderately thick and thick cross-ply [90/0/90] imperfect plane strain rings. These paths are often unstable in the presence of modal imperfections and material nonlinearity, and are considered to "bifurcate" from the primary equilibrium paths, representing periodic buckling patterns pertaining to global or structural level stability. The fully nonlinear finite element analysis, based on the total Lagrangian formulation, employs a three-dimensional theory, known as layer-wise linear displacement distribution theory (LLDT), to capture the three-dimensional interlaminar (especially, shear) deformation behavior, associated with the localized interlaminar shear-crippling failure. The combined effects of modal imperfections, interlaminar shearormal deformation and nonlinear (hypo-elastic) material property for the transverse shear modulus, G_(TT), on the localization and delocalization (deformation hardening) phenomena are thoroughly investigated, and physically meaningful conclusions are drawn from these numerical results.
机译：本研究与中等厚和厚的交叉层[90/0/90]不完美平面应变环的定位（变形软化的开始）以及定位后和“屈服”后的平衡路径有关。在模态缺陷和材料非线性的情况下，这些路径通常是不稳定的，并且被认为与主要平衡路径“分叉”，代表与整体或结构水平稳定性有关的周期性屈曲模式。基于总拉格朗日公式的完全非线性有限元分析，采用了三维理论，即分层线性位移分布理论（LLDT），来捕获三维三维（尤其是剪切）层间变形行为，局部的层间剪切破坏。彻底研究了模态缺陷，层间剪切/法向变形和横向剪切模量G_（TT）的非线性（次弹性）材料特性对局部和离域（变形硬化）现象的综合影响，并得出了有意义的结论从这些数值结果中得出。

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