基于多边形比例边界有限元的 复合材料裂纹扩展模拟
MODELLING OF CRACK PROPAGATION FOR COMPOSITE MATERIALS BASED ON POLYGON SCALED BOUNDARY FINITE ELEMENTS
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摘要: 该文采用近年提出的多边形比例边界有限元(Polygon Scaled Boundary Finite Elements, PSBFE),结合基于拓扑的局部网格重剖分方法,首次模拟了层状复合材料交界面、不同弹性模量的圆形夹杂对复合材料裂纹扩展的影响。结果表明,该文方法可以有效模拟复合材料的裂纹扩展,算例的结果同现有文献的实验数据和数值模拟结果吻合良好,采用不同网格密度和不同裂纹扩展步长对计算结果影响不大。基于SBFEM的PSBFE可以半解析求解裂纹尖端应力奇异性,具有比FEM更高的精度。另一方面,同现有基于SBFEM的裂纹扩展方法相比,基于拓扑的局部网格重剖分的PSBFE可以处理任意复杂的二维模型,具有更好的通用性。Abstract: The newly developed Polygon Scaled Boundary Finite Elements (PSBFE) combining with topography-based local remeshing technique is, for the first time, applied to the fracture analysis of composite materials. Near-interfacial crack propagation in a layered metal-ceramic structure is simulated and the effects of elastic constants mismatch on the interaction between a propagating crack and a single inclusion in brittle matrix materials are presented. The agreement between the simulating result, experimental and other numerical data available in literatures demonstrates a good validity and accuracy of the proposed method in predicting the crack-growth of composite material. The parametric study on the effect of mesh density and effect of different increments of crack propagation leads to the consistent results. This technique can represent the singular stress field at a crack tip more precisely than FEM. Meanwhile, it is more robust and universal than current crack growth simulation methods based on SBFEM.