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Stress intensity factor solutions for subsurface elliptical cracks in flat plates subjected to polynomial stress distributions

Lu, K. ; Katsuyama, Jinya  ; Li, Y. 

In this paper, the stress intensity factor (SIF) solutions for subsurface elliptical cracks near the free surface in flat plates were numerically investigated based on finite element analyses. The cracks with aspect ratios $$a/l$$ = 0, 0.1, 0.2, 0.3, 0.4 and 0.5, normalized ratios $$a/d$$ = 0, 0.1, 0.2, 0.4, 0.6 and 0.8 and $$d/t$$ = 0.1 were taken into account, where a is the crack half-depth, $$l$$ is the crack length, $$d$$ is the distance from subsurface crack to the nearest free surface and $$t$$ is the wall thickness. Fourth-order polynomial stress distributions in the thickness direction were considered. It was concluded that the numerical SIF solutions presented in the paper are useful in engineering applications.

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