Étude expérimentale et numérique du soudage multipasse : application à un acier de construction navale

Abstract : This thesis aims at studying and modeling a multipass welding operation of a high strength steel used in shipbuilding. In this framework, work focus on predicting the metallurgical and mechanical consequences of the process and, in particular, the residual stress distribution after welding. Since residual stresses can be detrimental to the performance of the welded product, their estimation is essential and numerical modelling is useful to predict them. Two welding mock-ups which are representative of a T- joint were used to characterize the evolution of thermal cycles, microstructure and residual stresses (measured by contour method and deep hole drilling) after each welding pass. Metallurgical and mechanical behaviors were thoroughly characterized in order to feed numerical models with reliable constitutive equations. The last part deals with the implementation of the models in the finite element calculation code Abaqus using specific subroutines. A scale transition procedure has been added to describe the thermomechanical multiphase behavior of the steel. Preliminary calculations were carried out for simple cases to validate the implementation of models. Different numerical couplings were made. First a thermal analysis then a thermo-metallurgical analysis, to estimate the hardness after each welding pass. Finally, a metallurgical-mechanical analysis is achieved for the prediction of residual stresses due to multipass welding. The results of the finite element calculations were discussed and compared with the experimental results obtained in the first part of this work.
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Submitted on : Wednesday, September 4, 2019 - 2:38:07 PM
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Constant Ramard. Étude expérimentale et numérique du soudage multipasse : application à un acier de construction navale. Physique [physics]. Université de Bretagne Sud, 2018. Français. ⟨NNT : 2018LORIS498⟩. ⟨tel-02278519⟩



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