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概要

This study proposes an innovative method for arresting SCC, fatigue and hydrogen assisted cracks, and making harmless the cracks by overload. By overloading, compressive residual stress is introduced ahead of the crack. The residual stress reduces K values and arrests the crack. By the method, KISCC, KIHE and ?Kth increase with increasing Kov (K value by overload) and the notional threshold values were given by　the equation: NKISCC, NKIHE and ? NKth=Ｃ + ＤKov. Where Ｃ is KISCC, KIHE and ?Kth(in the case of stress ratio is negative), respectively. Proportional constant D is about 0.27～0.3. Experimental results showed that D showed good agreement with theoretical values. However, in the case of fatigue D depends on stress ratio and it decrease with increasing stress ratio. If the notional threshold vales ( NKISCC, NKIHE and ?NKth) are enough larger than applied K or ?K values, crack is able to be arrested and can be made harmless.

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