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


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.


  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
  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
  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
  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
  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
  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
  12. Zahoor, A. Ductile Fracture Handbook. Novetech; 1991.