Modélisation DEM thermo-mécanique d'un milieu continu. Vers la simulation du procédé FSW

Abstract : Currently, almost all material manufacturing processes are simulatedusing methods based on continuum approaches. These methods, thoughwidely studied, face difficulties with contact problems that areusually found in processes such as FSW. One "physical" explanationto this issue is given by the fact that these methods use equationsbased on continuum mechanics to describe discontinuous problems. Insome cases, the Discrete Element Method is used to overcome theseproblems. However, it is known to be a very time-consuming method.Thus, a long term solution consists of coupling both continuum anddiscontinuous approaches. This solution requires an overlapping zonewhere the two methods work together. This overlapping zone isclassically placed on a continuous region. Consequently, the DiscreteElement Method must be improved to be reliable in such a region. Thepresent work describes a DEM approach to simulate elasto-plasticmechanical behaviour and heat conduction through a continuousmaterial. This method can be used both to carry out calculations onthe continuous overlapping zone as well as to be coupled withclassical Discrete Element Method in order to deal with discontinuousproblems.Finally, coupling between thermal and mechanical aspects is studiedand compared to experimental results found in the bibliography.
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Iñigo Terreros. Modélisation DEM thermo-mécanique d'un milieu continu. Vers la simulation du procédé FSW. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0060⟩. ⟨pastel-00996971⟩

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