The numerical simulation of interface crack propagation without re-meshing  

作　　者：XIA XiaoZhou ZHANG Qing WANG Hong YANG Shuai 

机构地区：[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China [2]Department of Engineering Mechanics, Hohai University, Nanjing 210098, China [3]College of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China

出　　处：《Science China(Technological Sciences)》2011年第7期1923-1929,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10972072);the National Basic Research Program of China ("973" Project) (Grant No. 2007CB714104);the Special Fund of State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering at Hohai University (Grant No. 2009585912)

摘　　要：Based on the framework of the extended finite element method (XFEM), the enriched exponent discontinuous function is modified properly by introducing the rigidity ratio of two sides materials of interface crack, and the portion integral scheme is adopted for interface elements containing two materials. To embody the singularity of the crack tip, the triangle function is introduced directly. What’s more, the maximum loop stress fracture criterion is adopted to determine the extension direction in extended material domains, and the true extension distance for each load step is determined by reducing or increasing half the current trial extension distance until the equivalent stress intensity factor reaches the type I fracture toughness of material. Finally, with the improved XFEM, the interface crack propagation in a cantilever deep beam and concrete gravity dam are simulated without re-meshing respectively and their failure modes are also analyzed.

关 键 词：XFEM enriched discontinuous function rigidity ratio cantilever deep beam concrete gravity dam interface crackpropagation 

分 类 号：O346.1[理学—固体力学] TH132.41[理学—力学]