Modeling delamination in composite laminates using XFEM by new orthotropic enrichment functions
Modeling delamination in composite laminates using XFEM by new orthotropic enrichment functions
复制标题
DOI：
10.1088/1757-899x/10/1/012240
复制
发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
S. E. Ashari;S. Mohammadi
中科院分区：
文献类型：
--
作者：
S. E. Ashari;S. Mohammadi
本文通过引入一组新的正交各向异性富集函数，改进了扩展有限元法（XFEM）。提出了一套新的双材料正交各向异性富集函数，并将其用于层状复合材料线弹性断裂力学的扩展有限元分析。层间裂纹尖端富集函数来自于无牵引界面裂纹周围的解析渐近位移场。在这个过程中，包含裂纹尖端或强/弱不连续的元素不需要符合这些几何形状。区域相互作用积分方法也被采用，以数值计算的混合模式的应力强度因子。一些基准测试进行了模拟，以评估所提出的方法的性能，并将结果与现有的参考结果进行比较。
In this research, the extended finite element method (XFEM) is improved for modeling interfacial cracks between two orthotropic media by new set of orthotropic enrichment functions. 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. In this procedure, elements containing a crack tip or strong/weak discontinuities are not required to conform to those geometries. 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 to available reference results.