A stress intensity factor estimation method for kinked crack. (1st February 2018)

• Record Type: Journal Article
• Authors: Li, Yufei; Sun, Tao; Gao, Qing; Tan, Chunqing
• Is Part Of: Engineering fracture mechanics. Volume 188(2018)
• Page Start: 202
• Page End: 216
• Publication Date: 2018-02-01
• Subjects: Kinked crack -- Stress intensity factors -- T-stress -- Mixed-mode fracture -- Weight function; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2017.07.013
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: A modified expression for estimating mixed-mode SIFs is presented. The third-order terms of stress field series are considered. The third-order coefficients are obtained by a fitting procedure. The cases of singly and doubly kinked crack with finite kink length are analyzed. The estimated SIFs are compared to finite element results and values estimated by other two methods. Abstract: 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.