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首页> 外文期刊>Composite Structures >Computational investigation of both intra-laminar matrix cracking and inter-laminar delamination of curved composite components with cohesive elements
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Computational investigation of both intra-laminar matrix cracking and inter-laminar delamination of curved composite components with cohesive elements

机译：含黏性元件的弯曲复合构件的层内基体开裂和层间分层的计算研究

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摘要

Curved composite components are widely used in engineering applications, such as aircraft wing spars, and subjected to complex 3D loadings. The most critical failure mechanisms of the curved parts are intra-laminar matrix cracking and inter-laminar delamination. A computational approach has been proposed to explicitly model the intra-laminar matrix cracking and inter-laminar delamination in L-shaped cross-ply laminates with cohesive elements. Zero-thickness cohesive elements with a mixed-mode traction-separation damage law are inserted in each 90 degrees lamina to predict matrix cracking and also inserted between neighboring plies to account for inter-laminar delamination. Two laminate stacking sequences with distinguished features of isolating different modes of failure have been investigated. The simulation results confirmed that stacking sequence [0/90(3)/0(2)/90(3)/0](s) trends to highlight the matrix failure mode, while the stacking sequence [0(3)/90/0(3)/90/0/90](s) trends to highlight the delamination mode. The kinking cracking across 90 degrees plies accompanying the delamination-dominated failure mode during the subsequent crack propagation can be also predicted. The computational results have been compared with the corresponding experimental observations reported in the literature. The good agreement with the reported experimental results verified the capability and effectiveness of computational modelling approach.
机译：弯曲的复合材料组件广泛用于工程应用中，例如飞机机翼翼梁，并承受复杂的3D载荷。弯曲部分最关键的破坏机制是层内基质开裂和层间分层。已经提出了一种计算方法来对具有粘性元件的L形交叉层板中的层内基质开裂和层间分层进行建模。将具有混合模式牵引-分离损伤定律的零厚度粘结元件插入每个90度层中以预测基体开裂，并且还插入相邻层之间以说明层间分层。已经研究了具有区分不同故障模式的显着特征的两个层压板堆叠顺序。仿真结果证实，堆叠序列[0/90（3）/ 0（2）/ 90（3）/ 0]（s）趋向于突出矩阵故障模式，而堆叠序列[0（3）/ 90 / 0（3）/ 90/0/90]（s）趋向于突出分层模式。还可以预测在随后的裂纹扩展过程中，伴随着以脱层为主的破坏模式而在90度层上发生的扭结裂纹。计算结果已与文献中报道的相应实验观察结果进行了比较。与所报道的实验结果的良好一致性证明了计算建模方法的能力和有效性。

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