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

Pierre-Guy Vincent (1, 2) , Pierre Suquet (3) , Yann Monerie (4) , Hervé Moulinec (3)

1 IRSN - Institut de Radioprotection et de Sûreté Nucléaire
2 MIST - Laboratoire de micromécanique et intégrité des structures
3 M&S - Matériaux et Structures
4 ThM2 - ThermoMécanique des Matériaux

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.

Mots clés: Variational calculus; Ductility; Constitutive behaviour; Ideally plastic material; Porous material; Variational calculus.; Variational calculus

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

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, 2014, 56, pp.74-98. ⟨10.1016/j.ijplas.2013.11.012⟩. ⟨hal-00912637⟩