서지주요정보
2.9 니켈-1.1 크롬 강에서 크립 균열 전파에 관한 연구 = Creep crack growth in 2.9 Ni-1.1 Cr steel
서명 / 저자 2.9 니켈-1.1 크롬 강에서 크립 균열 전파에 관한 연구 = Creep crack growth in 2.9 Ni-1.1 Cr steel / 조정환.
저자명 조정환 ; Jo, Jeong-Whan
발행사항 [서울 : 한국과학기술원, 1984].
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소장정보

등록번호

4102506

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8431

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초록정보

The fracture mechanics approach was used to investigate creep crack growth phenomenon in 2.9Ni - 1.1Cr steel. The tests were conducted in air at 550℃ using compact tension specimen with two different hardness levels. The crack growth rates were investigated in terms of the stress intensity factor K, effective stress σeff, and the strain energy rate parameter $C^{\ast}$ - integral. In general, the $C^{\ast}$ - integral turns out to be a better loading parameter than K or σeff even though uncertainties remain with the specimen with lower hardness level. At a given $C^{\ast}$ value, crack growth rate tends to increase with matrix hardness. Microscopic observation of crack tip region by SEM revealed the presence of near-coalesced grain boundary cavities, and this is consistent with the model that the macroscopic crack advances by the linkage of coalesced cavities with the main crack. The amount of accumulated damage, measured in terms of cavities area fraction, tended to increase with the applied $C^{\ast}$, and the same was true with the size of the damage zone. The size of cavities ahead of the main crack was found to be much smaller than that out of the smooth bar creep test. This point was discussed by stress and stress state ahead of a comparing the sharp crack and smooth bar under creep conditions.

서지기타정보

서지기타정보
청구기호 {MMS 8431
형태사항 [ii], 39 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jeong-Whan Jo
지도교수의 한글표기 : 유진
지도교수의 영문표기 : Jin Yu
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 23-24
주제 Creep.
Fracture mechanics.
Steel, structural.
크리프. --과학기술용어시소러스
균열 전파. --과학기술용어시소러스
파괴 역학. --과학기술용어시소러스
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