서지주요정보
3.5 Ni-Cr-Mo-V 강에서의 일정하중과 계단식하중 부과시의 크리프 균열 전파에 관한 연구 = Creep crack propagation under constant and step loading in 3.5 Ni-Cr-Mo-V steel
서명 / 저자 3.5 Ni-Cr-Mo-V 강에서의 일정하중과 계단식하중 부과시의 크리프 균열 전파에 관한 연구 = Creep crack propagation under constant and step loading in 3.5 Ni-Cr-Mo-V steel / 이환철.
발행사항 [대전 : 한국과학기술원, 1990].
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소장정보

등록번호

8001377

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 9027

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

리뷰정보

초록정보

The fracture mechanics approach was used to investigate creep crack growth phenomena in 3.5 Ni-Cr-Mo-V steels. Creep crack growth tests were performed in air at 550℃. Four kinds of compact tension specimens with different hardness levels and specimen geometries were prepared. In present investigation, the experimental results were analyzed in macroscopic and microscopic aspects, namely, continuum-mechanical and micromechanical view points. Continuum-mechanical analysis could determine the optimum load parameter to describe creep crack growth macroscopically under given conditions. Micromechanical analysis of crack growth could suggest the realation of cavity distribution and mechanism of crack growth during the test. It was demonstrated that the $C_t$ parameter was better loading parameter than K or $C^*$-integral in the studied experimental conditions. Attempts to correlate creep crack growth rate to stress intensity factor K and $C^*$-integral were unsuccessful. Microscopic observation of crack tip region in CT specimen revealed the presence of coalesced grain boundary cavities. This observation was consistent with the model of the macroscopic crack advances by the linkage of coalesced cavities with main crack. As the creep crack growth rate increased with applied load, the cavity size and the number of cavities at the crack tip decreased.

서지기타정보

서지기타정보
청구기호 {MMS 9027
형태사항 iv, 75 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hwan-Chul Lee
지도교수의 한글표기 : 강석중
공동교수의 한글표기 : 유진
지도교수의 영문표기 : Suk-Joong L. Kang
공동교수의 영문표기 : Jin Yu
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 38-40
주제 Nickel alloys.
Stress concentration.
Metals --Fracture.
크리프. --과학기술용어시소러스
균열 전파. --과학기술용어시소러스
응력 집중 계수. --과학기술용어시소러스
파괴 역학. --과학기술용어시소러스
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