1337 ラチェット疲労における微小き裂の成長挙動と寿命評価(S21-6 ステンレス鋼とチタン合金の疲労,S21 金属材料の疲労特性と破壊機構)

概要

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Micro-crack growth behaviors in ratcheting fatigue tests were investigasted to discuss the fatigue life reduction mechanism in ratcheting conditions. Ratcheting fatigue tests for 316FR stainless steel were conducted at 550C in order to discuss the design criteria for the commercialized fast reactor system. Fatigue lives decrease with increasing the accumulated strain, but the life reduction was negligible when the accumulated strain was less than 2.2%. Micro-crack growth behavior can be devided into initiation and growth stage. The crack initiation length was approximately 0.2mm. The initiation life was almost negligible when the fatigue life decreased by ratcheting. The micro-crack initiation life shortening was considered as the mechanism of fatigue life reduction in ratcheting conditions.
社団法人日本機械学会の論文
2005-09-18