Fatigue limit of circumferentially notched metastable austenitic stainless steel under positive/negative stress ratios: Synergistic effects of notch-root mechanistic singularity and phase transformation

Naoaki Nagaishi, Yuhei Ogawa, Saburo Okazaki, Hisao Matsunaga

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Fatigue tests of circumferentially notched Type 304 austenitic stainless steel (ASS) illuminated the unique dependences of fatigue limit on the stress concentration factor, Kt, and stress ratio, R. Fatigue limit under negative R was superior to that under positive R, a result was unexpected from the empirical behavior of smooth ASS. Moreover, switching R from negative to positive apparently diminished the effect of Kt escalation on the deterioration of the fatigue limit. Consolidation of microhardness tests, microstructural observation, finite element analysis revealed that these anomalies stem from the presence/absence of cyclic plasticity and martensitic transformation, which dynamically strengthen the notch-root.

本文言語英語
論文番号107229
ジャーナルInternational Journal of Fatigue
165
DOI
出版ステータス出版済み - 12月 2022

!!!All Science Journal Classification (ASJC) codes

  • モデリングとシミュレーション
  • 材料科学(全般)
  • 材料力学
  • 機械工学
  • 産業および生産工学

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