Abstract This paper presents a failure assessment curve (FAC), which predicts a conservative failure load of austenitic stainless steel pipes with a circumferential surface crack. Changes in material deformation properties due to cold working, neutron irradiation and thermal aging were taken into account. First, stress-strain curves for stainless steels were assumed for welded, irradiated, cold worked, thermal aged materials as well as undamaged materials using the Swift-type constitutive equation, whose material constants were estimated from the yield and ultimate strengths. Second, the FACs were analyzed for various material properties and crack and pipe geometries. It was shown that the FAC depended on the crack and pipe geometries, and the lower bound FAC were obtained. Finally, the universal FAC, applicable to stainless steel pipes regardless of crack geometries and material properties, was proposed.

中文翻译：

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核电站奥氏体不锈钢管失效评估曲线

摘要 本文提出了一种失效评估曲线（FAC），它预测了具有圆周表面裂纹的奥氏体不锈钢管的保守失效载荷。考虑了由于冷加工、中子辐射和热老化引起的材料变形特性的变化。首先，使用 Swift 型本构方程为焊接、辐照、冷加工、热时效材料以及未损坏材料假设不锈钢的应力 - 应变曲线，其材料常数是根据屈服和极限强度估算的。其次，分析了 FAC 的各种材料特性以及裂纹和管道几何形状。结果表明，FAC 取决于裂纹和管道几何形状，并获得了下限 FAC。最后，通用 FAC，