title: The use of the direct impact Hopkinson pressure bar technique to describe thermally activated and viscous regimes of metallic materials.
abstract: The influence of strain rate over domains involving the thermal activation and the viscous drag behaviour of the dislocations is discussed. While it is recognized that the Koslky-Hopkinson technique or split Hopkinson pressure bar technique can generate data up to the upper strain-rate limit of the thermal-activated regime, it is necessary to use a direct impact Hopkinson pressure bar technique to access the viscous regime. Data generated with this technique are presented for a series of metals, including steel, nickel, copper and tungsten alloys. The motivation to generate such data is provided through three industrial applications.
authors: Nexter Munitions, 7 route de Guerry, 18023 Bourges, France h.couque@nexter-group.fr.
authors: Hervé
authors: H
authors: Couque
keywords: direct impact Hopkinson technique; high strain rate; thermally activity regime; viscous regime