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혼합모드 하중하에서 레일강 가스압접부의 피로균열진전거동
김철수(Chul-Su KIM),손경주(Kyoung-Ju SOHN),강기원(Ki-Won KANG),김정규(Jllng-KYu KIM) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this study, the growth behavior of the transverse crack, which was the most dangerous damage among the various types of rail defects, was investigated under mode I and mixed mode loadings in a gas pressure welded part of rail steel. For the mixed mode, the fatigue crack growth behavior was discussed using comparative stress intensity factor ranges ΔKv proposed by Richard. In addition, in order to evaluate the effect of the crock closure quantitatively, the cack opening lond P?? was determined using clip-on gage and computerized image processing system. As a results of this, mixed mode crack growth rate da/dN regardless or the stress ratio could he correlated with the effective comparative stress intensity ractor ranges ΔK?? derived from P??.