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허용학(Y.-H Huh),김동진(D.J. Kim),이해무(H.M. Lee),홍성구(S.G. Hong),박준협(J.H. Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Fatigue limit of the copper film coated by Sn was estimated by using Goodman diagram and Gerber diagram. To obtain the high cycle fatigue life 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 0.1, 0.3 and 0.5 and the frequency of 40 ㎐ at room temperature in air. The 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.
Nano-indentation 실험과 유한요소 해석을 연계한 재료의 탄소성 물성 평가법 개발
김윤재(Y.J Kim),송태광(T.K Song),박준협(J-H Park),한준희(J-H Hahn) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Determination of elastic properties of nano-scale materials using nano-indentation tests is well established, but that of plastic properties is not yet clear. This paper presents a method to extract plastic properties from nano-indentation test, together with results from detailed elastic-plastic FE analysis. It shows that the plastic properties determined from this method are not unique, in the sense that a number of different plastic properties can give the same load-displacement response from nano-indentation test. Possible ways to overcome such problems are discussed.