| Numéro |
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
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|---|---|---|
| Page(s) | 325 - 330 | |
| DOI | https://doi.org/10.1051/jp4:2006134050 | |
| Publié en ligne | 26 juillet 2006 | |
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 325-330
DOI: 10.1051/jp4:2006134050
Theoretical and numerical study of strain localization under high strain rate solicitation
N. Ranc1, R. Raynal1, L. Taravella2, V. Pina1 and P. Hervé11 LEEE, E.A. 387 – Université Paris X, 1 chemin Desvallières, 92410 Ville d'Avray, France
2 CEP DGA/DET, 16 bis, Avenue Prieur de la Côte d'Or, 94114 Arcueil cedex, France
Published online: 26 July 2006
Abstract
Our study deals with the dynamic behavior of metallic
materials and in particular of titanium alloy TA6V. For high strain rates,
we can notice the occurrence of a phenomenon called adiabatic shearing. This
phenomenon is about a plastic instability, which results in the appearance
of a strain localization in narrow bands. In this paper we developed a
thermo mechanical model to reproduce the formation and the propagation of
adiabatic shear bands. A Johnson Cook thermo visco plastic behavior law was
chosen for the titanium alloy TA6V. The law parameters were identified from
static and dynamic torsion tests at various temperatures between ambient and
C. A 2D numerical simulation of torsion test was performed with the
explicit finite elements code Abaqus. The thermo mechanical coupling and the
heat conduction are taken into account. A roughness defect was inserted in
the centre of a torsion specimen. The results showed that the strain of
localization and the shear band speed increase when the amplitude and the
size of the defect decrease.
© EDP Sciences 2006