其他摘要：The viscoplastic selfconsistent (VPSC) formulation is by now a well established approach for simulating texture development and constitutive response during plastic forming of high and low-symmetry aggregates. In this work we consider the presence of voids of anisotropic shape inside 3D polycrystals submitted to large strain deformation. For this purpose, the originally incompressible VPSC formulation has been extended to deal with compressible polycrystals. In doing this, both the deviatoric and the spherical components of strain-rate and stress are accounted for. As a consequence, the extended model provides now a relationship between the void growth rate and the hydrostatic pressure, which in turn can be used to keep track of the porosity evolution in the polycrystal. The model is applicable to the stage of void growth but does not account for void nucleation or coalescence. The extended VPSC model is used here to study the role of voids (and their evolution) in texture evolution. In addition, we also study the coupling between texture, void shape, crystal symmetry and strain rate on both, mechanical response and void growth.
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