On the determination of the cohesive zone parameters for the modeling of micro-ductile crack growth in thick specimens

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	On the determination of the cohesive zone parameters for the modeling of micro-ductile crack growth in thick specimens
	C. R. Chen ; O. Kolednik ; I. Scheider ; T. Siegmund ; A. Tatschl ; F. D. Fischer
刊名	International Journal of Fracture
	2003
卷号	120 期号:3 页码:517-536
关键词	cohesive zone modeling micro-ductile fracture crack growth resistance constraint 3D finite element modeling elastic-plastic solids opening displacement fracture surface dissipation rate separation energy simulation resistance work interface
ISSN号	0376-9429
中文摘要	The paper deals with the determination of the cohesive zone parameters (separation energy, Gamma, and cohesive strength, T-max) for the 3D finite element modeling of the micro-ductile crack growth in thick, smooth-sided compact tension specimens made of a low-strength steel. Since the cohesive zone parameters depend, in general, on the local constraint conditions around the crack tip, their values will vary along the crack front and with crack extension. The experimental determination of the separation energy via automated fracture surface analysis is not accurate enough. The basic idea is, therefore, to estimate the cohesive zone parameters, Gamma and T-max, by fitting the simulated distribution of the local crack extension values along the crack front to the experimental data of a multi-specimen J(I C)-test. Furthermore, the influence of the cohesive zone parameters on the crack growth behavior is investigated. The point of crack growth initiation is determined only by the magnitude of Gamma. Both Gamma and T-max affect the crack growth rate (or the crack growth resistance), but the influence of the cohesive strength is much stronger than that of the separation energy. It turns out that T-max as well as Gamma vary along the crack front. In the center of the specimen, where plane strain conditions prevail, the separation energy is lower and the cohesive strength is higher than at the side-surface.
原文出处	://WOS:000184957800002
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/35796]
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,I. Scheider,et al. On the determination of the cohesive zone parameters for the modeling of micro-ductile crack growth in thick specimens[J]. International Journal of Fracture,2003,120(3):517-536.
APA	C. R. Chen,O. Kolednik,I. Scheider,T. Siegmund,A. Tatschl,&F. D. Fischer.(2003).On the determination of the cohesive zone parameters for the modeling of micro-ductile crack growth in thick specimens.International Journal of Fracture,120(3),517-536.
MLA	C. R. Chen,et al."On the determination of the cohesive zone parameters for the modeling of micro-ductile crack growth in thick specimens".International Journal of Fracture 120.3(2003):517-536.