High strain rate responses of some metals and alloys using a plate impact driven ring expansion test (PIDRET)
Résumé
A plate impact driven ring expansion test (PIDRET) has been developed to investigate the high strain rate
response of metals and alloys under radial expansion. Combining photonic Doppler velocimetry (PDV) probes
and ultra-high-speed cameras, it allows for measuring the radial expansion velocity of the ring and for recording
the different stages of the ring deformation until necking and ultimate fragmentation. Four metallic materials
with different physical and mechanical properties are tested under the same loading conditions leading to strain
rates around 10^4 s^1. The materials exhibit different responses in terms of deformation history and fracture. A
comparison is made on (i) the postmortem microstructure and ductility between low strain rate tension loaded
specimens and high-strain rate expansion loaded rings and (ii) numbers of necks and fragments between
experimental results and theoretical estimations.