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
刊名	International Journal of Fracture
	2005
卷号	132 期号:2 页码:135-152
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
ISSN号	0376-9429
中文摘要	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.
原文出处	://WOS:000230593300003
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34802]
专题	金属研究所_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.