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X-선 회절에 의한 피로파면거동과 응력세기계수 예측에 관한 연구
임만배(Man-Bae Lim),부명환(Myung-Hawn Boo),조충형(Chung-Hyung Joh),김영석(Young-Suk Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
This study investigated the effect of stress intensity factor ranges, or ΔK=Kmax-Kmin on residual stress for SG365 steel. The fatigue crack growth rates of the SG365 steels were determined at RT and 300℃ on the compact tension specimen under the ratio of Pmax and Pmin set at 0.1 and 0.5, respectively. To correlate ΔK and residual stress and the FWHM are measured on the fractured surface of the CT specimens using diffraction lines {211} determined by an X-ray residual stress tester. The Residual stress had no clear trend with ΔK but the FWHM had a nice linear relationship with ΔK. Based on the these results, the predictability of ΔK is discussed as a function of the FWHM and residual stress, if any, determined by X-ray diffraction lines.