Numerical investigation of plastic flow and residual stresses generated in hydroformed tubes
Article dans une revue avec comité de lecture
Author

211915 Mechanics surfaces and materials processing [MSMP]
423998 École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax [ENIS]

423998 École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax [ENIS]
Date
2021Journal
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and ApplicationsAbstract
During tube hydroforming process, the friction conditions between the tube and the die have a great importance on the material plastic flow and the distribution of residual stresses of the final component. Indeed, a three-dimensional finite element model of a tube hydroforming process in the case of square section die has been performed, using dynamic and static approaches, to study the effect of the friction conditions on both plastic flow and residual stresses induced by the process. First, a comparative study between numerical and experimental results has been carried out to validate the finite element model. After that, various coefficients of friction were considered to study their effect on the thinning phenomenon and the residual stresses distribution. Different points have been retained from this study. The thinning is located in the transition zone cited between the straight wall and the corner zones of hydroformed tube due to the die–tube contact conditions changes during the process. In addition, it is clear that both die–tube friction conditions and the tube bending effects, which occurs respectively in the tube straight wall and corner zones, are the principal causes of the obtained residual stresses distribution along the tube cross-section.
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