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석창성(Chang-Sung Seok),김형익(Hyung-Ick Kim),장필수(Pil-soo Chang),주재만(Jae-Man Joo),강정훈(Jeong-Hoon Kang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Most of the fatigue test were achieved in fully reversed condition that mean stress is zero. But,<br/> generally, mean stress can not be zero. This research was achieved the bending fatigue test that<br/> changes mean stress to spring steel and was studied relation with the mean stress and the fatigue life.<br/> The method to search effect about mean stress was extended S-N graph in two cases. One method was<br/> extended S-N graph using modified Miner's rule with considering damage. Another was extended using<br/> tendency of S-N graph. The exponential value(α) of mean stress-alternating stress equation is<br/> converged between the Goodman's and the Gerber's value even if fatigue life increases.