EFG Virtual Crack Closure Technique for the Determination of Stress Intensity Factor
The aim of this paper is to introduce a virtual crack closure technique based on EFG method for thread-shape crack. The cracked component is discretized and the displacement field is determined using a coupled FE/EFG method, by which EFG nodes are arranged in the vicinity of crack tip and FE elements in the remain part in order to improve computational efficiency. Two typical parameters, nodal force and crack opening displacement attached to crack tip are calculated by means of setting up an auxiliary FE zone around crack tip. Strain energy release rate (SERR), further stress intensity factor (SIF) are determined by the two parameters. The method to calculate SIF is named as virtual crack closure technique based on EFG method. It is showed by several numerical examples that using the method presented in this paper, SIF on the crack tip can be obtained accurately.
Guangfan Li, Yong Huang and Chaohe Chen
X. P. Chang et al., "EFG Virtual Crack Closure Technique for the Determination of Stress Intensity Factor", Advanced Materials Research, Vols. 250-253, pp. 3752-3758, 2011