Delamination analysis of composites by new orthotropic bimaterial extended finite element method
Delamination analysis of composites by new orthotropic bimaterial extended finite element method
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DOI：
10.1002/nme.3114
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发表时间：
2011-07
影响因子：
2.9
通讯作者：
S. E. Ashari;S. Mohammadi
中科院分区：
文献类型：
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作者：
S. E. Ashari;S. Mohammadi
对扩展有限元法（XFEM）进行了进一步改进，适用于含层间分层的复合材料层合板的断裂分析。提出了一套新的双材料正交各向异性富集函数，并将其应用于层状复合材料线弹性断裂力学的XFEM分析。从无牵引界面裂纹附近的渐近位移场导出了层间裂纹尖端富集函数。利用重面富集函数和弱间断面富集函数分别模拟界面裂缝和双材料弱间断面的不连续场。在此过程中，包含裂纹尖端或强/弱不连续的元件不需要符合这些几何形状。此外，同一网格可以用于分析不同的层间裂纹或分层扩展。为了数值计算混合模态应力强度因子，还采用了域相互作用积分法。模拟了一些基准测试来评估所提出方法的性能，并将结果与现有的参考结果进行了比较。版权所有©2011 John Wiley & Sons， Ltd
The extended finite element method (XFEM) is further improved for fracture analysis of composite laminates containing interlaminar delaminations. New set of bimaterial orthotropic enrichment functions are developed and utilized in XFEM analysis of linear‐elastic fracture mechanics of layered composites. Interlaminar crack‐tip enrichment functions are derived from analytical asymptotic displacement fields around a traction‐free interfacial crack. Also, heaviside and weak discontinuity enrichment functions are utilized in modeling discontinuous fields across interface cracks and bimaterial weak discontinuities, respectively. In this procedure, elements containing a crack‐tip or strong/weak discontinuities are not required to conform to those geometries. In addition, the same mesh can be used to analyze different interlaminar cracks or delamination propagation. The domain interaction integral approach is also adopted in order to numerically evaluate the mixed‐mode stress intensity factors. A number of benchmark tests are simulated to assess the performance of the proposed approach and the results are compared with available reference results. Copyright © 2011 John Wiley & Sons, Ltd.