ステンレス鋳鋼配管弾塑性破壊力学評価法のJSME維持規格とASME Section XIの比較

抄録

A revision of flaw evaluation of cast stainless steel pipe of JSME rules on fitness for service is planned. The points are to apply the limit load method to unaged or low SC pipe, introduce prediction models for S-S and J-R curve due to thermal aging embrittlement and revised Z-factor equations proposed by other authors. To confirm the applicability of the degradation model and the current and proposed Z-factors of JSME rules, EPFM analysis was performed and Z-factor was directly deduced from the analysis. Input conditions were provided at the ASME Section XI meeting. Directly deduced Z-factors were compared with those of JSME rules and ASME Section XI. It is revealed that the draft prediction models of JSME has good accuracy, Z-factors of JSME have a very large conservativeness, and those of ASME Section XI have proper values.