Analyse numérique de l'effet de la géométrie sur le comportement thermomécanique de quelques métaux en cisaillement

Abstract : This study has been devoted from one side to an numerical analysis of the transition from the isothermal to adiabatic conditions of deformation during plastic torsion of a thin-walled tube (for pure aluminium, copper and XC18 steel). On the other side the study adressed the effect of the tube length and level of lastic deformation on the transition zone as a function of nominal strain rate. It has been shown by numercal analyses that for small tube lengths at large strains and within the region of the nominal strain rates where the transition occurs, the plastic instability and localisation (occurence of the adiabatic shear bands) are possible exclusively due to a development of the temperature gradients. This effect has been shown for XC18 steel where thermal conductivity is relatively weak. Finaly, numerical simulations have been performed to study behaviour of the modified Double Shear Specimen loaded by a direct impact. The study enabled an optimization of the MDS specimen geometry eliminating some plastic deformation of the supports and unwanted rotation. It was also shown that at high niminal strain rates of shearing and at large deformations the distribution of strains and temperature fields have a tendency to be more localised within the shearing zone
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Omar Oussouaddi. Analyse numérique de l'effet de la géométrie sur le comportement thermomécanique de quelques métaux en cisaillement. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ052S⟩. ⟨tel-01776803⟩

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