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Modélisation microscopique et macroscopique du comportement d'un composite à matrice métallique

Abstract : A thermoviscoplastic model is presented to characterize the macroscopic behavior of a Metal Matrix Composite (MMC) reinforced with short fibers. This analysis is based on experimental data and numerical results in order to build up the theoretical model. The experimental analysis is performed with cycling loadings and with tension-compression tests at several temperatures and for different material directions. It allows to observe the evolution of the elastic domain with temperature, time and plastic strain. The numerical analysis performed in viscoplasticity on a unit cell using the Finite Element Method (FEM), gives informations about the residual stresses and plasticity in the material after the manufacturing thermal process. The macroscopic response is then studied for different loading paths. The theoretical model is based on homogenization techniques like the homogenization of a periodic media, the self-consistent method and the transformation concentration factor tensors developed by Dvorak. These methods allow to correlate the overall and local mechanical variables together. A simplified version degenerates into a purely macroscopic constitutive model. The macroscopic constitutive equations in thermo-elasto-viscoplasticity are based on a nonlinear kinematic hardening and takes into account, on the one hand, the effects and the evolution of the initial back stress and, on the second hand, the initial anisotropy of the material and its evolution during a viscoplastic flow.
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Submitted on : Tuesday, October 5, 2010 - 6:32:27 PM
Last modification on : Thursday, April 5, 2018 - 11:01:48 AM
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  • HAL Id : tel-00523623, version 1



Nathalie El Mayas Theet. Modélisation microscopique et macroscopique du comportement d'un composite à matrice métallique. Mécanique []. Ecole Nationale des Ponts et Chaussées, 1994. Français. ⟨tel-00523623⟩



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