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Buckling analysis of bilayer beam-columns with an asymmetric delamination

机译：双层不对称分层梁柱的屈曲分析

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摘要

A general analytical model is developed to evaluate buckling behavior of a bilayer beam-column with a through-the-width asymmetric delamination under simply supported boundary conditions. Both transverse shear deformation and local deformation at delamination tip are taken into account in the model by considering two sublayers in both delaminated and intact regions as two individual shear deformable ones. Interface continuity conditions, which account for effect of interface normal and shear stresses, are also introduced in the intact regions. Furthermore, the present model is capable of dealing with the case of delamination located arbitrary through thickness and along length of beam-columns. In comparisons with the results of classical Euler-Bernoulli beam model, Timoshenko beam model (rigid joint model) and finite element analysis, better agreements are achieved for the present flexible joint model, which captures local deformation at delamination tip due to consideration of interface normal and shear stress components. Parametric studies are conducted to evaluate influences of sublayer thickness ratio, delamination length, delamination location, specimen length, and material parameters on the critical buckling strain with emphasis on transverse shear deformation and local deformation at delamination tip. The developed model can be used with confidence in buckling analysis of layered structures with an arbitrary delamination through the length and thickness.
机译：建立了一种通用分析模型，以评估在简单支撑的边界条件下具有全宽度不对称分层的双层梁柱的屈曲行为。通过将分层区域和完整区域中的两个子层视为两个单独的剪切变形层，在模型中考虑了横向剪切变形和分层尖端处的局部变形。在完整区域中也引入了界面连续性条件，该条件考虑了界面法向应力和剪应力的影响。此外，本模型能够处理在整个厚度和沿梁柱长度方向上任意分层的分层情况。与经典的Euler-Bernoulli梁模型，Timoshenko梁模型（刚性接头模型）和有限元分析的结果进行比较，本柔性接头模型获得了更好的协议，该模型捕获了由于考虑了界面法线而在分层尖端处的局部变形和剪切应力分量。进行参数研究以评估次层厚度比，分层长度，分层位置，样本长度和材料参数对临界屈曲应变的影响，重点是分层剪切尖端的横向剪切变形和局部变形。所开发的模型可以放心地用于分层结构在长度和厚度上任意分层的屈曲分析中。

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  • 来源
    《Composite Structures》 |2018年第3期|363-373|共11页
  • 作者

    Liu Qinghui; Qiao Pizhong;

  • 作者单位

    Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, State Key Lab Ocean Engn, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, State Key Lab Ocean Engn, Shanghai 200240, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Layered beam-columns; Delamination; Buckling; Transverse shear deformation; Crack tip deformation;

    机译：分层梁柱;分层;屈曲;横向剪切变形;裂纹尖端变形;

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