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Prediction of welding residual distortions of large structures using a local/global approach

Duan, Y.G.  
  • 초록

    Prediction of welding residual distortions is more difficult than that of the microstructure and residual stresses. On the one hand, a fine mesh (often 3D) has to be used in the heat affected zone for the sake of the sharp variations of thermal, metallurgical and mechanical fields in this region. On the other hand, the whole structure is required to be meshed for the calculation of residual distortions. But for large structures, a 3D mesh is inconceivable caused by the costs of the calculation. Numerous methods have been developed to reduce the size of models. A local/global approach has been proposed to determine the welding residual distortions of large structures. The plastic strains and the microstructure due to welding are supposed can be determined from a local 3D model which concerns only the weld and its vicinity. They are projected as initial strains into a global 3D model which consists of the whole structure and obviously much less fine in the welded zone than the local model. The residual distortions are then calculated using a simple elastic analysis, which makes this method particularly effective in an industrial context. The aim of this article is to present the principle of the local/global approach then show the capacity of this method in an industrial context and finally study the definition of the local model.


  • 주제어

    Welding .   Residual distortions .   Local/global approach.  

  • 참고문헌 (9)

    1. V. Robin, T. Pyttel, J. Christlein and A. Strating, Fracture analyses of welded components, Mathematical Modelling of Weld Phenomena 7, in H. Cerjak(eds), Graz-Seggau, Austria, (2004) 
    2. SYSTUS/SYSWELD, User' manual, ESI Group, (2006) 
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    4. Lori L. Denault, Kathryn E. Carr, Junde Xu, David E. Schmidt and Joshua P. Breto, Evaluation of engineering software for predicting welding distortion of large ship structures, ShipTech 2007, January 30-31 (2007) 
    5. PAM ASSEMBLY, Technical documents, ESI Group, (2006) 
    6. J. B. Leblond, D. Pont, J. Devaux, D. Bru and J. M. Bergheau, Metallurgical and mechanical consequences of phase transformations in numerical simulations of welding processes, Modelling in Welding, Hot Powder Forming and Casting, in Pr Lennart Karl-sson (eds), Chap.5, (1997) 1-43 
    7. F. Waeckel, Une loi de comportement thermometallurgique des aciers pour le calcul mecanique des structures, PhD thesis, Ecole Nationale Superieure d'rts et Metiers, France, (1994) 
    8. L. Zhang, P. Michaleris, J. Sun and P. Marugabandhu, Evaluation of a decoupled plastic strain method for welding distortion prediction, Proceedings of the 7th international conference on trends in welding research, Georgia, USA, (2005) 541-546 
    9. Lars Fuglsang Andersen, Residual stresses and deformations in steel structures, PhD thesis, Technical University of Denmark, Lyngby, Denmark, (2000) 

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