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박경동(Keyoung-dong Park),류찬욱(Chan-uk Ryu) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
In this study, CT specimens were prepared from spring steel(SUP9) processed shot peening which was room temperature and low temperature experiment. And we got the following characteristics from fatigue crack growth test carried out in the environment of room temperature and low temperature at 25℃, -30℃, -50℃, -70℃ -100℃ and -150℃ in the range of stress ratio of 0.05 by means of opening mode displacement. The threshold stress intensity factor range △Kth in the early stage of fatigue crack growth (Region Ⅰ) and stress intensity factor range △ K in the stable of fatigue crack growth (Region Ⅱ) was decreased in proportion to descend temperature. It assumed that the fatigue resistance characteristics and fracture strength at low temperature and high temperature is considerable higher than that of room temperature in the early stage and stable of fatigue crack growth region.