The transverse strength of 90° plies located in cross‐ply laminates subjected to transverse tension is investigated numerically. To reach this aim, it is assumed that the transverse cracking is formed by coalescence of fiber–matrix debonding, which propagates along the planes parallel to the fibers. The two‐dimensional finite element model (FEM) investigates the dominant micromechanical damage mechanisms, fiber–matrix debonding, and matrix cracking using the cohesive zone model (CZM) and plasticity, respectively. The numerical simulation is according to the extended computational micromechanics (ECMM) approach, which can be applied as a useful virtual test method instead of performing costly characterization tests. The results obtained from the present study show that the defects such as voids, imperfections, and residual stresses contribute to reducing the in situ strength of 90° plies. In the case of using an interleaved woven layer, the formation of the first transverse crack in unit cells within 90° layer is delayed.

中文翻译：

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使用计算微力学方法对包含缺陷和交错编织层的交叉复合材料层压板进行原位强度分析

数值研究了位于横向叠层层压板中的90°层的横向强度。为了达到这个目的，假定横向裂纹是由纤维-基体剥离的结合形成的，该结合沿着平行于纤维的平面传播。二维有限元模型（FEM）分别使用内聚区模型（CZM）和可塑性来研究主要的微机械损伤机理，纤维-基体剥离和基体开裂。数值模拟是根据扩展计算微力学（ECMM）方法进行的，可以将其用作有用的虚拟测试方法，而不必执行昂贵的特征测试。从本研究中获得的结果表明，缺陷如空隙，缺陷，残余应力有助于降低90°帘布层的原位强度。在使用交错编织层的情况下，在90°层内的晶胞中的第一横向裂纹的形成被延迟。