Numéro
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) 1035 - 1040
DOI https://doi.org/10.1051/jp4:2006134158
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) 1035-1040

DOI: 10.1051/jp4:2006134158

Viscoplastic behavior of pure shocked iron

C. Voltz and F. Buy

Commissariat à l'Énergie Atomique, Centre de Valduc, 21120 Is-sur-Tille, France


Published online: 26 July 2006

Abstract
This paper proposes an analysis of shock wave effects established on dislocations mechanism for high purity iron. Pure iron is known to exhibit $\alpha $ to $\varepsilon $ (body-centered cubic to hexagonal close packed) phase transition when shocked to pressure above 13 GPa. This pressure induced a solid-solid completely reversible transformation. Material was submitted to shock wave, through plate impact tests, in the range of 4 GPa to 39 GPa. Post shock recovered iron, which undergoes $\alpha $ to $\varepsilon $ and return transition, cumulates strain-hardening, micro structural defects caused by imposed pressure and shear. The mechanical response to shock of pure iron is reviewed in this paper regarding to shock pressure. We use a formalism based on physical relations to describe stress strain curves, taking into account the dislocation density.



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