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- 저자 : Hironobu Fukui (검색결과 1 건)
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Effects of cyclic loading on fatigue properties of austenite stainless steel
Mitsuhiro Okayasu,Hironobu Fukui 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
Fatigue properties of stainless steels have been investigated by various researchers. The present work examined fatigue properties undervarious cyclic loading conditions to determine the significant factors of loading condition to fatigue strength (se). From this approach,no clear frequency effects on the S-Nf relation were detected, but clear R-ratio effects were identified on fatigue strength. A higher R-ratioyielded higher se, and a clear correlation was observed between R-ratio and endurance limit. A different trend was observed for the S-Nfcurve when the stress value on the ordinate of the S-Nf relation was plotted using the maximum tensile stress (smax). However, the S-Nfcurves obtained overlaid each other when using stress amplitude (sa) instead of smax. Fatigue properties were analyzed further using severalrelations proposed previously, such as modified Goodman relation. In this case, the fatigue data obtained were clearly approximatedby an elliptical relation. Severe microstructural damage arising from plastic deformation was observed in the sample fractured under theR = −1 condition, where striation was a main failure mode. In contrast, no clear microstructural damages were observed in the samplesfractured at R = 0.1 even when a higher maximum tensile stress was applied (e.g., smax = 60% sUTS), where ripple-like failure was thedominant feature.
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