J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 139 - 145
Publié en ligne 26 juillet 2006
EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 139-145

DOI: 10.1051/jp4:2006134022

Modelling and simulation of dynamic anisotropic degradation of structures under adiabatic shear banding

P. Longère1, A. Dragon2, H. Trumel3 and X. Deprince4

1  Laboratoire de Génie Mécanique et Matériaux, Université de Bretagne Sud, 56321 Lorient, France
2  Laboratoire de Mécanique et de Physique des Matériaux (UMR CNRS 6617), ENSMA, 86961 Futuroscope-Chasseneuil Cedex, France
3  CEA/DAM, Le Ripault, 37260 Monts, France
4  GIAT Industries, 18023 Bourges Cedex, France

Published online: 26 July 2006

The present work deals with the three-dimensional modelling of the behaviour of structural metallic materials allowing for adiabatic shear banding (ASB) as a mode of dynamic failure precursor. The anisotropic deterioration induced in the material by the presence of the bands is described via the concept of a “super dislocation” (see [6-8]) in the context of large viscoplastic deformation. The model accounts for strain hardening, thermal softening, rate sensitivity and includes ASB-induced anisotropy and softening in the post-critical stage. The onset of dynamic plastic localization in the form of ASB is controlled by a energy release rate threshold obtained from a linear perturbation method based analysis. 3D numerical simulations of the dynamic shearing of a hat shape structure (HSS) have been performed employing the code LS-DYNA and compared with experimental observations. The confrontation between numerical and experimental results constitutes the primary objective of this paper.

© EDP Sciences 2006