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김철수(Chul-Su KIM),상준영(Jun-Young SANG),김정규(Jung-Kyu KIM) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
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. For the mixed mode, the fatigue crack growth behavior was discussed using comparative stress intensity factor ranges ΔK <SUB>v</SUB> proposed by various researchers. In addition, in order to evaluate the effect of the crack closure quantitatively, the cack opening load P<SUB>op</SUB> was determined using clip-on gage and computerized image processing system. As a results of this, mixed mode crack growth rate da/dN regardless of the stress ratio could be correlated with the effective comparative stress intensity factor ranges ΔK<SUP>eff</SUP><SUB>v</SUB> derived from p<SUB>op</SUB>.