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Simulation of delamination growth in multidirectional laminates under mode Ⅰ and mixed mode Ⅰ/Ⅱ loadings using cohesive elements

机译:使用内聚单元模拟Ⅰ型和Ⅰ/Ⅱ型混合载荷下多向层压板的脱层生长。

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摘要

A numerical model for accurately predicting the delamination propagation in multidirectional laminates under mode Ⅰ and mixed-mode Ⅰ/Ⅱ loadings using the cohesive element is proposed in this paper. Instead of a constant fracture toughness, a fracture toughness function which reflects the variation of fiber bridging tractions, accompanying with a group of appropriate interface stiffness, interface strength, the number of cohesive elements in cohesive zone and viscosity coefficient determined by the trial and error method among recommended guidelines or values in literatures, can provide accurate simulations on the delamination growth in the multidirectional laminates. The predicted delamination behaviors of the multidirectional laminates with interfaces 0°/5°, 45°/-45° and 90°/90° in both the DCB and MMB tests are consistent with experimental outcomes, which give evidence of the effectiveness of the proposed model.
机译:提出了一种利用内聚元精确预测Ⅰ型和Ⅰ/Ⅱ型混合载荷下多向层合板的分层扩展的数值模型。断裂韧性函数不是恒定的断裂韧性,而是反映纤维桥接牵引力的变化,并伴随着一组适当的界面刚度,界面强度,内聚区中的内聚元素数量和通过试错法确定的粘度系数在文献中推荐的指南或值中,可以提供有关多向层压板中分层增长的准确模拟。在DCB和MMB测试中,界面为0°/ 5°,45°/ -45°和90°/ 90°的多向层压板的预测分层行为与实验结果相符,这为所提出的方法提供了证据模型。

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