Micromechanics of void growth at high rates

S. Mercier; A. Molinari

doi:doi:10.1051/jp4:2000969

Numéro		J. Phys. IV France Volume 10, Numéro PR9, September 2000 EURODYMAT 2000 - 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		Pr9-415 - Pr9-420
DOI		https://doi.org/10.1051/jp4:2000969

EURODYMAT 2000 - 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 10 (2000) Pr9-415-Pr9-420
DOI: 10.1051/jp4:2000969

Micromechanics of void growth at high rates

S. Mercier and A. Molinari

Laboratoire de Physique et Mécanique des Matériaux, ISGMP, Université de Metz, École Nationale d'Ingénieurs, Ile du Saulcy, 57045 Metz, France

Abstract
The aim of this work, based on a micromechanical approach, is to caracterise the behavior of porous material under dynamic conditions. The porous media is represented by an aggregate of hollow spheres. With use of a virtual velocity field, an analytical link between the porosity, the macroscopic strain rate and the macroscopic stress is obtained and provides the viscoplastic behavior of the porous media. The results of Carroll and Holt (1972) [l] concerning the dynamic compression of a porous aluminium are retrieved. The present model is not limited to spherical loadings. An application to an axisymmetric tensile path enlights the role of triaxiality on the evolution of voids.