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

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

DOI QR Code

Mis-Match Limit Load Analyses and Fracture Mechanics Assessment for Welded Pipe with Circumferential Crack at the Center of Weldment

용접부 중앙에 원주방향균열이 있는 배관에 대한 강도불일치 한계하중 해석 및 파괴역학 평가

  • Published : 2010.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, limit load analyses and fracture mechanics analyses were conducted via finite element analyses for the welded pipe with circumferential crack at the center of the weldment. Systematic changes for strength mismatch ratio, width of weldment, crack shape and thickness ratio of the pipe were considered to provide strength mismatch limit load. And J-integral calculations based on reference stress method were conducted for two materials, stainless steel and ferritic steel. Reference stress defined by provided strength mis-match limit load gives much more accurate J-integral.

본 논문에서는 유한요소 해석을 통해 용접부 중앙에 원주방향균열이 있는 배관에 대한 강도불일치 한계하중 해석 및 파괴역학 해석을 수행하였다. 강도불일치 한계하중식을 제시하기 위해 강도불일치 비, 용접부 폭, 균열 길이 및 배관 반경비에 대한 체계적인 변수 해석을 수행하였으며 참조응력법을 바탕으로 스테인리스강 및 페리틱 강에 대한 J-적분 계산을 수행하였다. 본 연구에서 제시한 강도불일치 한계하중을 사용하여 참조응력을 정의할 때, 보다 정확한 J-적분 결과를 얻을 수 있었다.

Keywords

References

  1. Schwalbe, K.H., Ainsworth, R.A., Eripret ,C, Gilles, P., Koçak M., Pisarski H., Wang Y.Y., 1997, “Common Views on the Effects of Yield Strength Mis-Match on Testing and Structural Assessment,” GKSS Research Centre Publications, pp. 99-134
  2. Kim, Y.J., Schwalbe,K.H., 2001, “Mismatch Effect on Plastic Yield Loads in Idealized Weldments : Ⅰ.Weld Centre Cracks,” Engineering Fracture Mechanics, Vol.68, pp. 163-182 https://doi.org/10.1016/S0013-7944(00)00093-X
  3. Kim, Y.J., Schwalbe, K.H., 2001, “Mismatch Effect on Plastic Yield Loads in Idealized Weldments : Ⅱ.Heat Affected Zone Cracks,” Engineering Fracture Mechanics, Vol.68, pp. 183-199 https://doi.org/10.1016/S0013-7944(00)00094-1
  4. Kim, Y.J., Schwalbe, K.H., “Conpendium of Yield Load Solutions for Strength Mis-Matched SE(T), SE(B) and C(T) Specimens,” Engineering Fracture Mechanics, Vol.68, pp. 1137-1151 https://doi.org/10.1016/S0013-7944(01)00016-9
  5. Hao, S., Cornec, A., and Schwalbe, K.H., “Plastic Stress and Strain Fields and Limit Loads of a Plane Strain Cracked Tensile Panel with a Mis-Matched Welded Joint,” International Journal of Solids and Structure, 34, pp. 297-326 https://doi.org/10.1016/S0020-7683(96)00021-2
  6. Park, B.K., Oh, C.K., Kim, Y.J., Kim, Y.J.,Kim, J.S., Jin, T.E., 2004, “The Analysis of Circumference Through-Wall Cracked Pipe Considering Weld Characteristic,” Proceedings of the KSME Fall Annual Meeting, pp. 31-36
  7. Song, T.K., Kim, Y.J., Kim, J.S., Jin, T.E., 2008, “Mis-Match Limit Load Analyses and Approximate Jintegral Estimates for Similar Metal Weld with Weld-Center Crack Under Tension Load,” Trans. of the KSME(A), Vo.32, No. 5, pp.411-418 https://doi.org/10.3795/KSME-A.2008.32.5.411
  8. ABAQUS, 2003, “ABAQUS Standard/User's Manual, Version 6.4,” Hibbit Karlsson & Sorensen, Inc., Pawtucket, RI, USA.
  9. Miller, A.G., 1988, “Review of Limit Loads of Structures Containing Defects,” International Journal of Pressure Vessels and Piping, Vol. 32, pp, 191-327
  10. British Energy Generation Ltd., 2007, “R6:Assessment of the Integrity of Structures Containing Defects,” Rivision 4
  11. Kim, Y.J., Shim, D.J., Nikbin, K., Kim, Y.J., Hwang, S.S., Kim, J.S., 2003, “Finite Element Based Plastic Limit Loads for Pipes with Part-Through Surface Cracks Under Combined Loading,” Int J. of Pres. Ves. and Pip., Vol. 80, pp.527-540 https://doi.org/10.1016/S0308-0161(03)00106-6
  12. Zahoor, A. Ductile Fracture Handbook. Novetech; 1991.