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[재료부문] AISI 316 스테인리스강의 크리프-피로 상호작용시 수명예측에 관한 연구
권영일(Youngil Kwon),김범준(Bumjoon Kim),임병수(Byeingsoo Lim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effect of tensile hold time on the creep-fatigue interaction in AISI 316 stainless steel was investigated. To study the fatigue characteristics of the material, strain controlled low cycle fatigue(LCF) tests were carried out under the continuous triangular waveshape with two different total strain ranges of 1.0% and 2.0%. To study the creep-fatigue interaction, 5 min.,<br/> 10 min., and 30 min. of tensile hold times were applied to the continuous triangular waveshape with the same two total strain ranges. The creep-fatigue life was found to be the longest when the 5 min. tensile hold time was applied and was the shortest when the 30 min. tensile hold time was applied. The cause for the shortest creep-fatigue life under the 30 min. tensile hold time is believed to be the effect of the increased creep damage per cycle as the hold time increases. Under the total strain range of 1%, significant reduction in life was observed as the tensile hold time was increased compared to the result of 2% total strain range. The theoretical prediction obtained by the Modified Coffin-Manson method and the experimental results of creep-fatigue life were found to be in resonable agreement with each other.<br/>
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