mprovement in the threshold stress intensity factor by tensile overload in large crack was investigated. The crack retarded zone and the non-propagating crack size was validated based on the fracture surface observation. It was observed that crack propagation was retarded by the overload during the fatigue tests. The size of non-propagating cracks and the crack retarded zone corresponded well to the calculated value . Moreover, in order to evaluate the overload effects on the small crack like defect, bending fatigue tests were carried out and discussed the effect of crack size on the improvement of the ∆Kth.
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