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허용학(Yong-Hak Huh),김동진(Dong Jin Kim),이해무(Hae Moo Lee),홍성구(Sung Gu Hong),박준협(Jun Hyub Park) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10
Fatigue limit of the copper film coated by Sn was estimated using Goodman diagram and Gerber diagram. To obtain the high cycle fatigue life curve, S-N curve, of the film, the high cycle fatigue test was carried out by applying the constant amplitude load to the film specimen with three different stress ratio of 0.05, 0.3 and 0.5 and the frequency of 40 ㎐ at room temperature in air. The free-standing film specimen 15.26㎛ thick was fabricated by etching process. The fatigue limits and S-N curves at the respective stress ratios were determined from the experimental works. It was shown that the S-N curves were dependent on the stress ratio and the fatigue limit was increased with decreasing the stress ratio. The dependency of the fatigue behavior was presented in empirical relationship. Using these relationships, the fatigue limit was predicted.