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论文类型：期刊论文

发表时间：2018-08-01

发表刊物：ENGINEERING FRACTURE MECHANICS

收录刊物：SCIE

卷号：199

页面范围：308-326

ISSN号：0013-7944

关键字：Interface crack; Dynamic stress intensity factor; Singular element; Precise time domain expanding algorithm

摘要：A novel Symplectic Analytical Singular Element (SASE), defined by the analytical symplectic eigen expanding terms, is used within the framework of the finite element method (FEM), to obtain the dynamic stress intensity factors (DSIFs) of bi-material interface cracks under dynamic loading. In the space domain, the vicinity of the crack tip is represented by using the SASE, while the other area is meshed with conventional elements. In the time domain, the precise time domain expanding algorithm is adopted, in which a self-adaptive technique is carried out to improve computing accuracy. Taking advantage of the SASE, DSIFs can be obtained directly without any post-processing through the relationship between the DSIFs and the eigen expanding coefficients. The numerical accuracy and stability of the proposed method are investigated carefully through the conducted numerical examples. The results show that the present method is effective and efficient.