한국압력기기공학회 논문집 (Transactions of the Korean Society of Pressure Vessels and Piping)
- 제8권3호
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- Pages.13-22
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- 2012
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- 1738-8333(pISSN)
DOI QR Code
원주방향 경사관통균열이 존재하는 두꺼운 배관의 탄성 균열열림변위
Elastic Crack Opening Displacement of Slanted Circumferential Through-Wall Cracks in Thick-Walled Cylinder
- 한태송 (서울과학기술대학교 기계시스템디자인공학과) ;
-
허남수
(서울과학기술대학교 기계시스템디자인공학과) ;
- 심도준 ;
-
김진수
(한국원자력안전기술원 건설원자력규제단) ;
-
이진호
(한국원자력안전기술원 건설원자력규제단)
- Han, Tae-Song ;
-
Huh, Nam-Su
;
- Shim, Do-Jun (Engineering Mechanics Corporation of Columbus) ;
-
Kim, Jin-Su
;
-
Lee, Jin-Ho
- 투고 : 2012.10.08
- 심사 : 2012.11.19
- 발행 : 2012.12.01
초록
According to recent research on leak-rate estimates to assess rupture probabilities of nuclear piping which contains a circumferential surface/through-wall cracks due to PWSCC, i.e., xLPR (Extremely Low Probability of Rupture) program, it has been revealed that the use of crack shape with an idealized circumferential through-wall crack during actual crack growth can lead to overestimate of the leak-rate. Thus, for accurate estimation of the leak-rate during crack growth, the more realistic crack shape that can simulate the crack shape transition from surface crack to through-wall crack should be used. In this context, in the present study, the elastic crack opening displacement of slanted circumferential through-wall crack in thick-walled cylinder was proposed based on 3-dimensional elastic finite element fracture mechanics analyses. To propose the elastic crack opening displacement of slanted circumferential through-wall crack in thick-walled cylinder, the geometric variables affecting crack opening displacement, i.e., thickness of cylinder, reference inner crack length and slant crack ratio were systematically varied. In terms of loading conditions, axial tension, global bending moment and internal pressure were considered. The present results can be applied to calculate the leak-rate considering more realistic crack shape transition from surface crack to idealized through-wall crack, and can be expected to enhance current leak-rate estimation scheme, for instance, in xLPR program etc.