서지주요정보
3.5NiCrMoV강에서 일정 $C_t$ 및 일정 변위율 조건에서의 크리프 균열 전파에 관한 연구 = A study of the creep crack growth behavior in 3.5NiCrMoV steel under constant $C_t$ or constant displacement rate conditions
서명 / 저자 3.5NiCrMoV강에서 일정 $C_t$ 및 일정 변위율 조건에서의 크리프 균열 전파에 관한 연구 = A study of the creep crack growth behavior in 3.5NiCrMoV steel under constant $C_t$ or constant displacement rate conditions / 류석현.
발행사항 [서울 : 한국과학기술원, 1989].
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4105587

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8909

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초록정보

The creep crack growth behavior in 3.5NiCrMoV steel had been investigated by using compact type tension specimen under constant $C_t$ and constant displacement rate conditions. For constant $C_t$ tests, $C_t$ strongly rely on load line displacement rate adn is maintained with constant value under constant displacement rate condition. But $C^*$ usually increase with crack length though load is reduced in order to maintain constant $C_t$ value as crack extends. Constant crack growth rate is held during crack growth of 1mm distance with constant $C_t$ value. At this constant $C_t$ regions, $à$ ~ $[C_t]^0.86$. While, at constant load region, $à$ $[C_t]^{0.92}$ and $à$ ~ [C^*]^0.60$ For constant displacement rate tests, crack growth rate increase and $à$ ~ [C^*]^0.50$ as the crack extends to the critical length. After this critical length, crack growth is essentially independent of crack length and $C_t$ is maintained with almost constant value. Fully Coalesced Area(FCA) ahead of crack tip tend to increase as $C_t$ increase to the critical value (in this experiments, critical $C_t$=2000 [N/m.hr]). After the critical value, FCA tend to decrease as $C_t$ increase. Contribution of steady state creep deformation for total displacement is changed as crack length increase. For the tertiary stage of crack growth test, the most of displacement is due to steady state creep, only small part is due to primary creep and other effects Test have to be interrupted in this tertiary stage to obtain high value of $C_t$. Therefore, this constant $C_t$ experiments are tested in the steady state creep regime.

서지기타정보

서지기타정보
청구기호 {MMS 8909
형태사항 v, 85 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Seog-Hyeon Ryu
지도교수의 한글표기 : 유진
지도교수의 영문표기 : Jin Yu
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 33-34
주제 Creep.
Deformations (Mechanics)
Steel, structural.
크리프. --과학기술용어시소러스
균열 전파. --과학기술용어시소러스
변형 (찌그러짐) --과학기술용어시소러스
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