OS2213 オーステナイト系ステンレス鋼切欠き材の高サイクル疲労強度に及ぼす過大応力と水素の影響と疲労限度低下の予測(OS22-4 水素と疲労,OS-22 水素環境の材料強度特性への影響)

概要

論文の詳細を見る
To ensure safely use of hydrogen utilization machines after large earthquakes, the effects of multiple overloads and hydrogen on high-cycle fatigue strength of notched specimens were studied. The materials were SUS304 and SUS316L. For both materials, the fatigue strength was significantly reduced by multiple overloads. The cause was small cracks formed by the overloads. In SUS304, the reduction of fatigue strength was enhanced by hydrogen. The cause of the enhanced reduction was the acceleration of propagation of the small cracks. In SUS316L, there was no enhanced reduction. A prediction method of the fatigue strength under the effects of hydrogen and multiple overloads was proposed through the evaluations of the crack propagation using plastic strain range and the fatigue limit related to the crack length.
一般社団法人日本機械学会の論文
2011-07-16