In the matter of the difference between the growth rate at the two crack ends, it increases (i.e., the crack tip growth rates ratio (d a /d N ) 2 /(d a /d N ) 1 decreases) with the drop in the initial projected short-branch length and in the initial branch angle, not observing a clear trend with the intensity of fatigue (SIF range).
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Effect of the Crack Tip Bifurcation on the Plasticity-Induced Fatigue Propagation in Metallic Materials.
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