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소형 펀치 크리프 실험변수 변환에 의한 크리프 특성 평가
김범준(Bumjoon Kim),배시연(Siyeon Bae),심언태(Untae Shim),임병수(Byeongsoo Lim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Generally, the conventional creep specimen is tested under uniaxial stress whereas the small punch creep specimen is under multiaxial stress. The focus of this work is to investigate the relationship between the small punch creep test data and conventional creep test data by the analysis similar to the Monkman-Grant relationship using the experimentally acquired test data. Creep behavior of 9Cr-2W ferritic steel was studied at elevated temperature. Creep tests were performed using a small punch creep tester at constant loads and a conventional creep tester at constant stress. Time to fracture and the minimum displacement rate measured during the small punch tests are related in a similar manner to the corresponding conventional creep tests. From the relation derived similar to the Monkman-Grant relation, a correlation between the displacement rate in small punch creep test and the strain rate in conventional creep test is established and creep lives were evaluated by it.