Magnetic pulse forming processes : Computational modelling and experimental validation

Abstract : Magnetic pulse forming is a technology that has gained interest in the last decades – thanks to the increased formability it offers for high-resistance-low weight ratio materials such as aluminum and magnesium alloys. One major complexity of the process lies in the design and study at the work piece level and the interaction between the several physical aspects involved: the electromagnetic waves as source of energy, the thermo-mechanics controlling the strain and stress evolution, as well as the study of fracture and damage under high-speed loading conditions. This work is dedicated to the development of a predictive model and computational tool able to deal with the interaction between the electromagnetism and the thermo-mechanics in a 3D finite elements frame work. We introduce the computational aspects of the electromagnetism, from the selected approach to include the geometry of the parts down to the coupling with the electric machinery behind the process. This is followed by the computational techniques needed to couple the electromagnetic computation to the thermo-mechanical one with a special focus on the problem of tracking the displacement of the deformable part within the electromagnetic module. We also introduce some aspects more related to the physics of the process such as the phenomena of elastic spring-back elimination and surface bonding (welding). In the last chapter we present the experimental facilities available at the laboratory. A methodology for identification of the electric parameters defining the machinery and needed to perform the simulation is introduced.
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José Rodolfo Alves Zapata. Magnetic pulse forming processes : Computational modelling and experimental validation. Mechanics of materials [physics.class-ph]. PSL Research University, 2016. English. ⟨NNT : 2016PSLEM010⟩. ⟨tel-01417196⟩

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