Comparison of cohesive zone parameters and crack tip stress states between two different specimen types

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	Comparison of cohesive zone parameters and crack tip stress states between two different specimen types
	C. R. Chen; O. Kolednik
	2005
发表期刊	International Journal of Fracture
ISSN	0376-9429
卷号	132 期号:2 页码:135-152
摘要	The cohesive zone parameters (separation energy and cohesive strength) and the crack tip triaxialities are compared between a compact tension (CT) and a double edge notched tension (DENT) specimen with smooth side-surfaces. The material is a pressure vessel steel 20MnMoNi55. The cohesive zone parameters are determined by fitting the simulated crack extensions near the midsection to the experimental data. The purpose of the study is to understand the relationship between the cohesive zone parameters and the crack tip stress triaxiality. The results show that for the same cohesive zone parameters the crack tip triaxiality near the midsection is lower in DENT specimens than in CT specimens. When the separation energy is set constant for CT and DENT specimens, the cohesive strength for the DENT specimens should be significantly lower than that for the CT specimens in order to make the simulated crack extensions near the midsection fit to the experimental data. Near the midsection, the cohesive strength and crack tip triaxiality influence each other: the specimen with a higher stress triaxiality has a higher cohesive strength; an increase of cohesive strength results in an increase of the crack tip triaxiality.
部门归属	austrian acad sci, erich schmid inst mat sci, a-8700 leoben, austria. univ sydney, sch aerosp mech & mechatr engn, ctr adv mat technol, sydney, nsw 2006, australia. shenyang natl lab mat sci, shenyang 110016, peoples r china. mat ctr leoben, a-8700 leoben, austria.;kolednik, o (reprint author), austrian acad sci, erich schmid inst mat sci, a-8700 leoben, austria;kolednik@unileoben.ac.at
关键词	Cohesive Zone Model Crack Growth Resistance Crack Tip Constraint Fracture Process Zone Micro-ductile Fracture Thin Aluminum Panels Ductile Fracture Growth Resistance Void Nucleation Model Separation Predictions Interface Elements Work
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34802
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. R. Chen,O. Kolednik. Comparison of cohesive zone parameters and crack tip stress states between two different specimen types[J]. International Journal of Fracture,2005,132(2):135-152.
APA	C. R. Chen,&O. Kolednik.(2005).Comparison of cohesive zone parameters and crack tip stress states between two different specimen types.International Journal of Fracture,132(2),135-152.
MLA	C. R. Chen,et al."Comparison of cohesive zone parameters and crack tip stress states between two different specimen types".International Journal of Fracture 132.2(2005):135-152.