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Effects of gaps and overlaps on the buckling behavior of an optimally designed variable-stiffness composite laminates - A numerical and experimental study

机译：间隙和重叠对优化设计的可变刚度复合材料层压板屈曲行为的影响-数值和实验研究

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摘要

This paper reports an experimental and numerical investigation of the effects of gaps and overlaps on the buckling behavior of variable-stiffness composite laminates. In the experimental study, variable-stiffness composite laminates with a constant-curvature fiber path were manufactured and tested under uniaxial compression to failure with simply supported edges. The tested panels were optimized to simultaneously maximize the in-plane stiffness and the buckling load. Two manufacturing strategies - complete overlaps and complete gaps - were adopted to allow the independent effect of each type of defect to be investigated in isolation. In the numerical study, a two-dimensional finite element model was built using the commercial software Abaqus through a Python input script. A MATLAB routine was also implemented to localize the gaps and overlaps within the studied variable-stiffness laminates. A linear buckling analysis was performed to calculate the pre-buckling strength and the critical buckling load for each tested composite laminate. Thereafter, a nonlinear analysis using the Riks method was performed to predict the load-displacement relationship, considering the geometric imperfections of cured composite laminates. A good correlation was observed between the results obtained from the finite element simulations and from the experiments. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文报道了间隙和重叠对可变刚度复合材料层压板屈曲行为影响的实验和数值研究。在实验研究中，制造了具有恒定曲率纤维路径的可变刚度复合材料层压板，并在单轴压缩下对具有简单支撑边缘的破坏进行了测试。对测试面板进行了优化，以同时最大化平面内刚度和屈曲载荷。采用两种制造策略-完全重叠和完全间隙-可以单独研究每种缺陷的独立影响。在数值研究中，使用商业软件Abaqus通过Python输入脚本建立了二维有限元模型。还实施了MATLAB例程以定位所研究的可变刚度层压板中的间隙和重叠。进行了线性屈曲分析，以计算每个测试复合层压板的预屈曲强度和临界屈曲载荷。此后，考虑到固化复合层压板的几何缺陷，使用Riks方法进行了非线性分析以预测载荷-位移关系。从有限元模拟和实验获得的结果之间观察到良好的相关性。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composite Structures》 |2016年第4期|556-566|共11页
  • 作者

    Marouene A.; Boukhili R.; Chen J.; Yousefpour A.;

  • 作者单位

    Polytech Montreal, Dept Mech Engn, 2900 Blvd Edouard Montpetit, Montreal, PQ H3C 3A7, Canada;

    Polytech Montreal, Dept Mech Engn, 2900 Blvd Edouard Montpetit, Montreal, PQ H3C 3A7, Canada;

    Natl Res Council Canada, Struct Mat & Mfg Lab, 5145 Decelles Ave, Montreal, PQ H3T 2B2, Canada;

    Natl Res Council Canada, Struct Mat & Mfg Lab, 5145 Decelles Ave, Montreal, PQ H3T 2B2, Canada;

  • 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

    Automated fiber placement; Buckling; Gaps/overlaps; Variable-stiffness composite laminates;

    机译：自动化纤维放置;屈曲;间隙/重叠;可变刚度复合材料层压板;

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