서지주요정보
크립조건하의 균열 발생과 진전에 관한 연구 = A study on crack initiation and propagation under creep conditions
서명 / 저자 크립조건하의 균열 발생과 진전에 관한 연구 = A study on crack initiation and propagation under creep conditions / 최영환.
발행사항 [대전 : 한국과학기술원, 1990
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소장정보

등록번호

8000292

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 9007

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리뷰정보

초록정보

Both crack initiation problem and crack propagation problem in creep fracture are studied. In the crack initiation problem, an applicability of some fracture parameter such as stress intensity factor (K), $C^*$ integral, net stress, and crack tip opening displacement (CTOD) as a creep crack initiation parameter is investigated. Crack initiation time is measured as a function of various crack initiation parameters. The crack tip blunting process under creep conditions is also investigated. In order to estimate the CTOD size a relation between the CTOD and a parameter Cb proposed here is proposed. In the crack propagation problem, the applicabilities of both the C integral and the CTOD rate as a fracture parameter which governs the crack growth behavior under extensive creep conditions are investigated. A modified $C^*$ integral, Cm, as a creep fracture parameter is also proposed considering the effect of crack growth. It is shown that the parameter does not depend on crack velocity. By performing experiments using STS 304 stainless steel and STS 316 stainless steel at 600'C and 625'C respectively, the following results are obtained; (1) the CTOD size is well predicted by the CTOD-Cb relation; (2) crack initiation time for the stainless steels can be correlated with $C^*$ integral, however, the critical value of CTOD at the instant of crack initiation is not constant. A crack initiation model based on the variation of creep ductility with strain rate proposed here is shown to give reasonable agreement with the experiment; (3) creep crack growth rate of the stanless steels can be correlated with the $C^*$ integral, the CTOD rate, and the Cm parameter.

서지기타정보

서지기타정보
청구기호 {DME 9007
형태사항 [v], 102 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Hwan Choi
지도교수의 한글표기 : 엄윤용
지도교수의 영문표기 : Youn-Young Earmme
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 53-64
주제 Fracture mechanics.
Stress concentration.
Steel, stainless.
크리프. --과학기술용어시소러스
균열 전파. --과학기술용어시소러스
응력 집중 계수. --과학기술용어시소러스
파괴 역학. --과학기술용어시소러스
균열 개구 변위. --과학기술용어시소러스
Creep.
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