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	Crack propagation in polycrystalline elastic-viscoplastic materials using cohesive zone models
	Wu, YC ; Zhang, KS
	2010-05-07 ; 2010-05-07
关键词	crack propagation elasto-viscoplastic cohesive zone model polycrystal grain boundary DUCTILE FRACTURE GROWTH METAL PLASTICITY INITIATION Mathematics, Applied Mechanics
中文摘要	Cohesive zone model was used to simulate two-dimensional plane strain crack propagation at the grain level model including grain boundary zones. Simulated results show that the original crack-tip may not be separated firstly in an elastic-viscoplastic polycrystals. The grain interior's material properties (e.g. strain rate sensitivity) characterize the competitions between plastic and cohesive energy dissipation mechanisms. The higher the strain rate sensitivity is, the larger amount of the external work is transformed into plastic dissipation energy than into cohesive energy, which delays the cohesive zone rupturing. With the strain rate sensitivity decreased, the material property tends to approach the elastic-plastic responses. In this case, the plastic dissipation energy decreases and the cohesive dissipation energy increases which accelerates the cohesive zones debonding. Increasing the cohesive strength or the critical separation displacement will reduce the stress triaxiality at grain interiors and grain boundaries. Enhancing the cohesive zones ductility can improve the matrix materials resistance to void damage.
语种	英语 ; 英语
出版者	SHANGHAI UNIV ; SHANGHAI ; 149 YANCHANG RD, SHANGHAI 200072, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/16101]
专题	清华大学
推荐引用方式 GB/T 7714	Wu, YC,Zhang, KS. Crack propagation in polycrystalline elastic-viscoplastic materials using cohesive zone models[J],2010, 2010.
APA	Wu, YC,&Zhang, KS.(2010).Crack propagation in polycrystalline elastic-viscoplastic materials using cohesive zone models..
MLA	Wu, YC,et al."Crack propagation in polycrystalline elastic-viscoplastic materials using cohesive zone models".(2010).

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