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. Deprince41 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)
Abstract
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