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
	2003
发表期刊	International Journal of Fracture
ISSN	0376-9429
卷号	120 期号:3 页码:517-536
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.
部门归属	mat ctr leoben, a-8700 leoben, austria. shenyang natl lab mat sci, shenyang 110016, peoples r china. austrian acad sci, erich schmid inst mat sci, a-8700 leoben, austria. gkss forschungszentrum geesthacht gmbh, d-21502 geesthacht, germany. purdue univ, sch mech engn, w lafayette, in 47907 usa. univ leoben, inst mech, a-8700 leoben, austria.;chen, cr (reprint author), mat ctr leoben, a-8700 leoben, austria
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
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35796
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,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.