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Buckling behavior of composite laminates with multiple delaminations under uniaxial compression

机译：单轴压缩下具有多个分层的复合层压板的屈曲行为

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The buckling behaviors of composite laminates with multiple delaminations under uniaxial compression are studied. Different types of multiple delaminations are considered and their effects upon buckling behavior are examined. The nonlinear buckling analysis uses a finite element method, including contact elements to prevent the overlapping situation, to predict the buckling stress and the corresponding buckling mode. The results indicate that as the length of the beneath delaminations is not larger than the length of the near-surface delamination, the beneath delaminations have no significant effects on the buckling stress, such that the buckling behaviors of multiple delaminations are almost the same as those of single delamination. When a short delamination appears above the long delamination, three types of multiple delaminations are investigated. If the length of the short delamination is greater than one critical value, the short delamination above the long delamination will reduce the buckling stress and change the buckling mode. When the short delamination approaches the same length as the long delamination, the buckling stress becomes the value of the single delamination case.
机译：研究了单轴压缩下具有多个分层的复合层压板的屈曲行为。考虑了不同类型的多次分层，并研究了它们对屈曲行为的影响。非线性屈曲分析使用有限元方法（包括接触元素以防止发生重叠情况）来预测屈曲应力和相应的屈曲模式。结果表明，由于下分层的长度不大于近地表分层的长度，下分层对屈曲应力没有显着影响，因此多次分层的屈曲行为几乎与屈曲行为相同。分层。当短分层出现在长分层之上时，将研究三种类型的多次分层。如果短分层的长度大于一个临界值，则长分层之上的短分层将减小屈曲应力并改变屈曲模式。当短脱层达到与长脱层相同的长度时，屈曲应力就成为单脱层情况的值。

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