Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Restraint of Pressure Induced Bending on Crack Opening Evaluation for Circumferential Through-Wall Cracked Pipe

원주방향 관통균열 배관의 균열열림 평가에 미치는 압력유기굽힘의 구속효과

  • Published : 2001.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

The effects of restraint of pressure induced bending(PIB) on crack opening for circumferential through-wall crack in a pipe were investigated. In this study, the elastic and elastic-plastic finite element analyses were performed to evaluate crack opening displacement(COD) for various restraint conditions and crack size. The results showed the restraint of PIB decreased crack opening for a given crack size and tensile stress, and the decrease in crack opening was considerable for large crack and short restraint length. A1so, the effect was more significant in tole results of elastic-plastic analysis compared with in the elastic analysis results. In the elastic-plastic analysis results, tole restraint effect was increased with increasing applied tensile stress corresponding to internal pressure. Additionally, the restraint effect on COD was independent on the variation in pipe diameter and decreased with increasing pipe thickness, and It depended on not total restraint length but shorter restraint length for non-symmetrically restrained.

Keywords

References

  1. Pipe Break Task Group, 1984, 'Evaluation of Potential for Pipe Breaks,' NUREG-1061, Vol. 3
  2. Zahoor, A., 1989, 'Ductile Fracture Handbook,' EPRI NP-6301-D
  3. Noriis, D.M. and Chexal, B., 1987, PICEP : Pipe Crack Evaluation Program(Revision 1), EPRI NP-3596-SR, Rev.1
  4. 최영환, 정연기, 이정배, Gery Wikowski, 1996, '페라이트 강 배관내의 원주방향 표면균열 평가를 위한 새로운 Z-Factor의 개발,' 대한기계학회논문집A권, 제20호, 제5권, pp. 1798-1809
  5. 허남수, 임창주, 김영진, 표창률, 박치용, 2000, '원자력발전소 주요기기의 건전성 평가를 위한 3차원 탄소성 해석 시스템의 개발,' 대한기계학회논문집A권, 제24권, 제8호, pp. 2015-2021
  6. Wilkowski, G. M., Ahmad, J., Barnes, C. R., Brust, F., Ghadiali, N., Guerrieri, D., Jones, D., Kramer, G., Landow, M., Marschall, C. W., Olson, R., Papaspyropoulos, V., Pasupathi, V., Rosenfeld, M., Scott, P., and Vieth, P., 1989, 'Degraded Pipng Program-Phase II : Summary of Technical Results and Their Significance to Leak-Before-Break and In-Service Flaw Acceptance Criteria,' NUREG/CR-4082, Vol. 8
  7. Schmidt, R.A., Wilkowski, G.M., and Mayfield, M.E., 1991, 'The International Piping Intergrity Research Group (IPIRG) Program : An Overview,' Proc. SMiRT-11, Vol. G2, pp. 177-188
  8. Ghadiali, S., Rahman, S., Choi, Y. H., and Wilkowski, G. M., 1996, 'Deterministic and Probabilistic Evaluations for Uncertainty in Pipe Fracture Parameters in Leak-Before-Break and In-Servicee Flaw Evaluations,' NUREG/CR-6443
  9. Ragman , S., Ghadeali, N., Wilkowski, G. M., Moberg, F., and Brickstad, B., 1998, 'Crack-Opening-Area Analysis for Circumferential Through-Wall Cracks in Pipes-Part III : Off-center Cracks, Restraint of Bending, Thickness Transition and Weld Residual Stresses,' International Journal of Pressure Vessel and Piping, Vol. 75, pp. 397-415 https://doi.org/10.1016/S0308-0161(97)00083-5
  10. Rahman, S., Brust, F., Ghadiali, N., Choi, Y. H., Krishnaswamy, P., Moberg, F., Brickstad, B., and Wilkowski, G. M., 1998, 'Refinement and Evaluation of Crack-Opening-Area Analysis for Circumferential Through-Wall Cracks in Pipes,' NUREG/CR-6300