回転曲げと引張圧縮下の疲労寿命差に関する一考察

概要

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Rotary-bending and push-pull fatigue tests were performed for JIS S15CK low-carbon and SNCM439 alloy steels. The fatigue lives for crack initiation and final failure plotted against stress amplitude were much shorter in push-pull loading than rotary-bending loading. This difference in fatigue lives almost disappeared however, in the life curves plotted against the cyclic strain amplitude, which was measured during fatigue tests. The surface crack growth rate, da/dN plotted against the strain intensity factor range, and ΔKε were expressed by a linear line on double logarithmic scales, independent of the test mode. The fatigue life for crack propagation was esimated by integrating the equation derived from this da/dN vs.ΔKεrelation. The life estimated in this way produced only a small difference between the rotary-bending and the push-pull fatigues, compared with the the scatter found in the presest data. Thus, the strain-based fatigue life is hardly influenced by the test mode in the crack propagation and crack initiation processes.
一般社団法人日本機械学会の論文
1989-05-25