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압력용기용 강의 응력비에 따른 저온 피로균열 진전특성에 관한 연구
박경동(KYUNG-DONG PARK),하경준(KYUNG-JUN HA),박형동(HEYOUNG-DONG PARK) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.3
In this study, CT specimens were prepared from Pressure Vessel Steel which was used for pressure vessel plates for room and low temperature service. And we got the following characteristics from fatigue crack growth test carried out in the environment of room and low temperature at 25℃, -30℃, -60℃, -80℃, -100℃ and -120℃ and in the range of stress ratio of 0.05 and 03 by means of opening mode displacement. At the constant stress ratio, 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 increased in proportion to descend temperature. It assumed that the fatigue resistance characteristics and fracture strength at low temperature is considerable higher than that of room temperature in the early stage and stable of fatigue crack growth region. The straight line slope relation of logarithm da/dN -△K in Region Ⅱ, that is, the fatigue crack growth exponent m increased with descending temperature at the constant stress ratio. It was assumed that the fatigue crack growth rate da/dN is rapid in proportion to descending temperature in Region Ⅱ and the cryogenic-brittleness greatly affect a material with decreasing temperature.