期刊
ENGINEERING FRACTURE MECHANICS
卷 188, 期 -, 页码 202-216出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2017.07.013
关键词
Kinked crack; Stress intensity factors; T-stress; Mixed-mode fracture; Weight function
类别
资金
- Innovation Foundation Program of Chinese Academy of Sciences [CXJJ-16S054]
A method for estimating the stress intensity factors (SIFs) of kinked crack with finite kink length is presented. This method is based on an estimation expression which is derived by He et al. according to the work of Cotterell and Rice from the stress field series of the original (unkinked) crack tip to the second order by using weight function (WF). In order to increase the estimation accuracy for the kinked crack with finite kink length, the third order coefficients of the stress field series of the original crack tip are introduced into this expression and these parameters can be obtained by a fitting procedure. Application of this modified expression to the cases of singly-kinked, edge kinked and doubly-kinked cracks reveals a good approximation with the finite element (FE) results of SIFs and showed that the accuracy is increased. (C) 2017 Elsevier Ltd. All rights reserved.
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