On the dynamic plasticity and strength of polycrystalline beryllium

Dynamic deformation and failure behavior of polycrystalline beryllium under uniaxial strain conditions within impactor velocity range of 16–285 m/s are studied by using a light gas gun facility. In the majority of experiments the thicknesses of target and impactor were adjusted to provide spallation. It is found that dynamic failure in tension during spallation is strongly dependent on the plastic instability threshold under compression at the front of compressive pulse.