622 長さの異なる複数の片側き裂を有する帯板の応力拡大係数

概要

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To investigate the behavior of stress intensity factors of multiple edge cracks with nonuniform lengths a series of finite element analyses were performed for a multiply cracked finite plate, in which two kinds of edge cracks with different lengths were arranged alternately. The ratio of crack interval to plate width h/W was varied in a range from 0.025 to 0.2. The short crack length was varied in 0.25≤a/W≤2.0,while the long crack length in 1.0≤b/a≤4.0. To evaluate K under residual stress field distributed stress p=σ_n(x/W)^n (n=0,1,2,3,4) was applied on the crack surface, where σ_n is a constant and x is a distance from edge. Stress intensity factor K of each crack was evaluated by means of the virtual crack extension method. The K value of the long crack increased rapidly with its crack length compared to K of multiple cracks with uniform lengths. This may explain the selective propagation of multiple cracks.
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