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

doi:10.1016/j.ijfatigue.2022.107229

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

Research output: Contribution to journal › Article › peer-review

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Abstract

Fatigue tests of circumferentially notched Type 304 austenitic stainless steel (ASS) illuminated the unique dependences of fatigue limit on the stress concentration factor, K_t, 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 K_t 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.

Original language	English
Article number	107229
Journal	International Journal of Fatigue
Volume	165
DOIs	https://doi.org/10.1016/j.ijfatigue.2022.107229
Publication status	Published - Dec 2022

All Science Journal Classification (ASJC) codes

Modelling and Simulation
Materials Science(all)
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.ijfatigue.2022.107229

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Fatigue limit of circumferentially notched metastable austenitic stainless steel under positive/negative stress ratios: Synergistic effects of notch-root mechanistic singularity and phase transformation. / Nagaishi, Naoaki; Ogawa, Yuhei; Okazaki, Saburo et al.
In: International Journal of Fatigue, Vol. 165, 107229, 12.2022.

Research output: Contribution to journal › Article › peer-review

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abstract = "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.",

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AU - Matsunaga, Hisao

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N2 - 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.

AB - 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.

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

Abstract

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