J0301-1-3 軽水配管用ステンレス鋼の高サイクル疲労寿命に及ぼす平均応力の影響(規格における疲労関連課題と方向性(1))

概要

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Establishment of a life evaluation method for structural components is essential for the rational operation and maintenance of light water reactor plants. In this study, high-cycle fatigue tests for austenitic stainless steel SUS316NG were conducted at 288℃ with mean stress. The effect of mean stress on fatigue life was investigated through the correlation with the variation of mean strain and strain amplitude. Methods to predict fatigue life under mean stress condition was newly developed based on the concept of ductility exhaustion. The stress-based approach such as the modified Goodman constituting the basis of the current design rule predicted excessively conservative fatigue life, while the developed methods gave more accurate prediction.
社団法人日本機械学会の論文
2009-09-12