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Analytical and numerical studies on the buckling of delaminated composite beams

机译：分层复合梁屈曲的分析和数值研究

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In this article, an innovative approach is proposed using the Euler-Bernoulli beam and classical lamination theory (CLT) to create an analytical model that can be used to obtain the buckling load of a delaminated composite beam. Furthermore, the finite element method is used as a tool to validate the analytical model. An 8-noded shell element and a contact pair are used in the numerical simulation. Studies are carried out on ply orientation, stacking sequence, through-the-width location of the delamination, delamination length and effect of total number of plies. It is found that application of R_2 to the analytical model will always yield a more accurate answer than use of R_1. It is also observed that (B_(16)~2)/(A_(66)) is an important expression that must be included to compute the flexural stiffness of the individual sub-laminates of the anti-symmetric laminated beam considered more accurately. Moreover, it is noted that the length of the delamination will affect the accuracy and difference between the analytical predictions. Nevertheless, the analytical results and simulation values are in good agreement.
机译：在本文中，提出了一种使用Euler-Bernoulli梁和经典层压理论（CLT）的创新方法，以创建可用于获得分层复合梁的屈曲载荷的分析模型。此外，有限元方法被用作验证分析模型的工具。数值模拟中使用了一个8节点壳单元和一个接触对。研究层的方向，堆叠顺序，分层的整个宽度位置，分层的长度以及层总数的影响。发现将R_2应用于分析模型将始终比使用R_1产生更准确的答案。还观察到，（B_（16）〜2）/（A_（66））是必须包含的一个重要表达式，用于计算更准确地考虑的反对称叠层梁的各个子叠层的抗弯刚度。此外，应注意，分层的长度将影响分析预测之间的准确性和差异。但是，分析结果与模拟值吻合良好。

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