過大荷重によるＳＣＣ、疲労、水素脆性き裂の進展阻止とき裂の無害化
Arrest of SCC, Fatigue and Hydrogen Assisted Cracks, and Make Harmlessthe Cracks by Overload
著者:
安藤 柱 Kotoji ANDEO 高橋 宏治 Koji TAKAHASHI 北條 恵司 Keiji HOUJYOU 橋倉 靖明 Yasuaki HASHIKURA 水上 博嗣 Hiroshi MIZUKAMI 佐野 勇人 Hayato SANO
発刊日:
公開日:
Crack ArrestFatigueHydrogen Assisted CrackMake Crack HarmlessOverload EffectSCC
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 reduce K values and arrest the crack. By theory, Kiscc, Kjhe and Kth increase with increasing Kov (K value by overload) and the nominal threshold values were given the equation: “Kuscc, NKjhe and NK th=C + D Kov. Where C is Kiscc, Kihe and Kth, respectively, and D is a proportional constant and 0.24 ~0.27. Experimental results showed that D showed good agreement with theory, except SUS316 steel by SCC. The reason was assumed that SCC test time for Kiscc definition was not enough but shorter. If threshold vales are enough larger than applied K and K values, crack is able to grow and can be made harmless.
