A New Method to Calculate Stress Intensity Factor for Parallel Double Cracks

Abstract

Abstract: In order to obtain simply stress intensity factors (SIFs) of multi cracks, a new method was proposed to calculate SIFs of parallel double cracks based on maximum crack opening displacement (MCOD) for the double parallel cracked plate subject to uniform tension loads. On the basis of the obtained relationship between the SIFs and the MCOD in the single cracked model, the influences of crack spacing ratios (vertical and longitudinal) and crack lengths ratios were considered, and the function expressions between modified coefficients and vertical spacing ratios were fitted in the different crack lengths ratios conditions when longitudinal spacing ratios is zero. And then, the influences of crack longitudinal spacing ratios on SIFs of parallel double cracks were studied. Finally, an easy way to calculate the SIF of parallel double cracks was presented.

Key words: parallel double cracks, maximum crack opening displacement, stress intensity factor, modified coefficient, crack spacing ratio, crack length ratio

CLC Number:

U 661.4

CHEN Jing-Jie-a, HUANG Yi-a, WU Zhi-Min-b. A New Method to Calculate Stress Intensity Factor for Parallel Double Cracks[J]. Journal of Shanghai Jiaotong University, 2012, 46(08): 1263-1268.

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