Effective flow surface of porous materials with two populations of voids under internal pressure: II. full-field simulations

Abstract : This study is devoted to the effective plastic flow surface of a bi-porous material saturated by a fluid. Highly irradiated uranium dioxide is a typical example of such a material. In part I of this study, a GTN-type approximation of the effective plastic flow surface has been derived. In this second part, the predictions of this new model are compared with full-field numerical simulations performed with a numerical method based on Fast Fourier Transforms. This method is successfully applied to voided materials with a Gurson matrix where the voids are subjected to internal pressure. Different microstructures containing a large number of spherical or ellipsoidal voids are investigated. The deviation from isotropy of their mechanical response is measured by a new criterion.
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Pierre-Guy Vincent, Pierre Suquet, Yann Monerie, Hervé Moulinec. Effective flow surface of porous materials with two populations of voids under internal pressure: II. full-field simulations. International Journal of Plasticity, Elsevier, 2014, 56, pp.74-98. <10.1016/j.ijplas.2013.11.012>. <hal-00912637>

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