In situ analysis of residual stresses relaxation and redistribution in welded joints subjected to cyclic solicitations
Modelling and predicting the fatigue durability of welded assemblies is critical in the industry. Current calculations are not accurately predictive and lead to a misestimation of the fatigue life and the appearance of cracks in the heat-affected zone (HAZ), which were not predicted by models. These inaccuracies in the prediction and modelling of the fatigue behaviour of welded assemblies are in particular due to poor consideration of multiscale residual welding stresses and their evolution during use (fatigue, punctual overloads, etc.). This proposal aims to improve fatigue prediction models by taking ointo account the the residual welding stresses as well as their possible relaxation and redistribution during a polycyclic fatigue test (that is to say under stresses below the fatigue limit of the assembly). To do so the volume of heterogeneous heat affected zone will be scanned in volume before, during and after a low stress cyclic solicitation.
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HERAUD Lorene; BARRALLIER Laurent and PIRLING Thilo. (2021). In situ analysis of residual stresses relaxation and redistribution in welded joints subjected to cyclic solicitations. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-313
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