J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 1035-1040
Viscoplastic behavior of pure shocked ironC. Voltz and F. Buy
Commissariat à l'Énergie Atomique, Centre de Valduc, 21120 Is-sur-Tille, France
Published online: 26 July 2006
This paper proposes an analysis of shock wave effects established on dislocations mechanism for high purity iron. Pure iron is known to exhibit to (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 to 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.
© EDP Sciences 2006