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압력용기용 A516강의 저온피로크랙전파특성에 관한 연구
박경동(Kyung-Dong Park),노태영(Tae-Young Ro),김영대(Young-Dae Kim),김형자(Hyung-Ja Kim),손재윤(J-Y Son) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.3(Ⅰ)
In this study, CT specimens were prepared from ASTM A5l6 Gr. 65 which was used for pressure vessel plates for moderate and lower temperature service. Fatigue crack growth test was carried out in the environment of low temperature of 10℃, -10℃, -30℃ and -50℃ and in the range of stress ratio of R=0.05 and 0.3 by means of opening mode displacement<br/> Based on these test results, the characteristics from temperature and stress ratio were shown as follows.<br/> 1) As the stress ratio, R increased da/dN and ΔK of 2nd stage gradually decreased. And as R decreased, the effect of temperature became greater and greater.<br/> 2) As the temperature descended, da/dN decreased on a certain ΔK, and ΔK did in a same da/dN. And the stress ratio, R exerted greater influence at the lower temperature.<br/> 3) The fatigue crack growth constant, m increased at 10℃ and -10℃, and decreased at -30℃ and -50℃ following the increment of stress ratio R. And m increased along with the reduction of temperature greatly decreased at -30℃ to come close to two(2).