THE EFFECTS OF LOADINGS ON WELDING RESIDUAL STRESSES AND ASSESSMENT OF FRACTURE PARAMETERS IN A WELDING RESIDUAL STRESS FIELD

被引:0
|
作者
Wei, Liwu [1 ]
He, Weijing [1 ]
Smith, Simon [1 ]
机构
[1] TWI Ltd, Struct Integr Grp, Cambridge, England
关键词
PIPES;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The level of welding residual stress is an important consideration in the ECA of a structure or component such as a pipeline girth weld. Such a consideration is further complicated by their variation under load and the complexity involved in the proper assessment of fracture mechanics parameters in a welding residual stress field. In this work, 2D axi-symmetric FEA models for simulation of welding residual stresses in pipe girth welds were first developed. The modelling method was validated using experimental measurements from a 19-pass girth weld. The modeling method was used on a 3-pass pipe girth weld to predict the residual stresses and variation under various static and fatigue loadings. The predicted relaxation in welding residual stress is compared to the solutions recommended in the defect assessment procedure BS 7910. Fully circumferential internal cracks of different sizes were introduced into the FE model of the three-pass girth weld. Two methods were used to introduce a crack. In one method the crack was introduced instantaneously and the other method introduced the crack progressively. Physically, the instantaneously introduced crack represents a crack originated from manufacturing or fabrication processes, while the progressively growing crack simulates a fatigue crack induced during service. The J-integral values for the various cracks in the welding residual stress field were assessed and compared. This analysis was conducted for a welding residual stress field as a result of a welding simulation rather than for a residual stress field due to a prescribed temperature distribution as considered by the majority of previous investigations. The validation with the 19-pass welded pipe demonstrated that the welding residual stress in a pipe girth weld can be predicted reasonably well. The relaxation and redistribution of welding residual stresses in the three-pass weld were found to be significantly affected by the magnitude of applied loads and the strain hardening models. The number of cycles in fatigue loading was shown to have little effect on relaxation of residual stresses, but the range and maximum load together governed the relaxation effect. A significant reduction in residual stresses was induced after first cycle but subsequent cycles had no marked effect. The method of introducing a crack in a FE model, progressively or instantaneously, has a significant effect on J-integral, with a lower value of J obtained for a progressively growing crack. The path-dependence of the J-integral in a welding residual stress field is discussed.
引用
收藏
页码:1503 / 1513
页数:11
相关论文
共 50 条
  • [41] The influence of weld pattern on the welding residual stresses
    Enzinger, N
    Cerjak, H
    [J]. TRENDS IN WELDING RESEARCH, PROCEEDINGS, 2003, : 850 - 854
  • [42] NUMERICAL ANALYSIS OF RESIDUAL STRESSES IN HYPERBARIC WELDING
    Ren, Xiaobo
    Akselsen, Odd M.
    As, Sigmund K.
    Nyhus, Bard
    [J]. PROCEEDINGS OF THE ASME 31ST INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2012, VOL 6, 2012, : 137 - 143
  • [43] CHARACTERISTICS OF FORMATION OF RESIDUAL WELDING STRESSES IN PULSED-ARC WELDING
    GORSHKOV, AI
    MATYUSHK.BA
    SLAVIN, GA
    [J]. WELDING PRODUCTION, 1971, 18 (01): : 61 - &
  • [44] EFFECTIVENESS OF METHODS FOR REDUCING RESIDUAL WELDING STRESSES
    NEDOSEKA, AY
    [J]. AUTOMATIC WELDING USSR, 1974, 27 (03): : 61 - 64
  • [45] DETERMINING RESIDUAL WELDING STRESSES IN CYLINDRICAL SHELLS
    PODSTRIG.YS
    PLYATSKO, GV
    OSADCHUK, VA
    KARASEV, LP
    [J]. AUTOMATIC WELDING USSR, 1971, 24 (03): : 37 - &
  • [46] Structural Integrity Assessment of a Propellant tank in Presence of Welding Residual Stresses
    Viswanath, V.
    Asraff, A. K.
    Jayesh, P.
    Thomas, Suresh Mathew
    Krishnakumar, R.
    Muthukumar, R.
    [J]. 2ND INTERNATIONAL CONFERENCE ON STRUCTURAL INTEGRITY AND EXHIBITION 2018 (SICE 2018), 2019, 14 : 442 - 448
  • [47] Effect of cyclic creep on residual welding stresses
    Degtyarev, V.A.
    Shul'ginov, B.S.
    Mikhailov, O.N.
    Gushcha, O.I.
    [J]. Strength of materials, 1988, : 301 - 308
  • [48] RESIDUAL STRESSES IN JOINTS PRODUCED BY EXPLOSIVE WELDING
    POKATAEV, EP
    TRYKOV, YP
    KHRAPOV, AA
    [J]. WELDING PRODUCTION, 1972, 19 (09): : 15 - 18
  • [49] Influence of welding technology on residual stresses distribution
    Junek, L
    Ochodek, V
    Lamac, Z
    [J]. MATHEMATICAL MODELLING OF WELD PHENOMENA 4, 1998, : 576 - 583
  • [50] RESIDUAL WELDING STRESSES DETERMINED BY MAGNETOELASTIC METHOD
    OREKHOV, GT
    [J]. AUTOMATIC WELDING USSR, 1974, 27 (04): : 28 - 30