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Simulation de réparation par soudage et billage ultrasonore d’un alliage à base Nickel

Abstract : During a repair welding process, the first step is to remove the material in the defected area, then refill this chamfer by welding rods. Since, the nickel based alloy, such as IN600, is sensitive to the phenomenon of stress-corrosion cracking, it must be ensured that the level of residual stress after welding is lower than the triggering threshold of stress-corrosion cracking. At this stage, the ultrasonic shot peening (USP) process can be used as the final finishing step. The aim is to introduce compressive residual stresses on the surface of the welded area in order to prevent occurrence of cracking. The objective of this study is to predict the level of residual stresses, induced by the ultrasonic shot peening, on structure made of IN600 repaired by multipass welding. To achieve this objective, an experimental study of the ultrasonic shot peening was carried out. Experiments similar to the “Almen” test were performed on thin and thick specimens. Influential parameters were identified. Experimental results, such as the level of residual stresses, were obtained. The originality of this work is that a three-dimensional modeling of multiple impacts, based on a Semi-Analytical Method (SAM), was implemented. This method can reduce significantly the computing time compared to finite element method, without sacrificing the quality of results. This was first validated by benchmarks for both single and multiple impacts, then proved by experiments. Moreover, a numerical simulation of welding was performed. The field of welding residual stresses should be used as the input data for the impact model. In fact, in this study,the residual state,was generated by alternatif bending test. These specimens were then treated by USP process with the parameters identified previously. As the final step, numerical results in terms of distortions and residual stresses were compared with the experimental data in order to validate the chaining of welding and peening simulation.
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  • HAL Id : tel-00715778, version 1

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Jun Li. Simulation de réparation par soudage et billage ultrasonore d’un alliage à base Nickel. Autre. INSA de Lyon, 2011. Français. ⟨NNT : 2011ISAL0153⟩. ⟨tel-00715778⟩

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