Spall fracture of copper under loading by shock waves with duration less 1 microsecond

V.I. Skokov; O.N. Ignatova; A.N. Malyshev; A.M. Podurets; V.A. Raevsky; M.I. Tkachenko; M.A. Zocher

doi:10.1051/epjconf/20101000019

EPJ

Spall fracture of copper under loading by shock waves with duration less 1 microsecond

V.I. Skokov¹^a, O.N. Ignatova¹, A.N. Malyshev¹, A.M. Podurets¹, V.A. Raevsky¹, M.I. Tkachenko¹ and M.A. Zocher²

¹ FSUE “RFNC – VNIIEF”, Sarov, Russia
² Los Alamos National Laboratory, Los Alamos NM 87545, USA

Abstract

The paper presents results of experimental researches on spall fracture of polycrystalline copper when loading by shock waves with intensity of 20–33 GPa and duration < 1 μs. It is shown that decrease of copper spall strength is observed behind SW front at SW intensity of ∼ 33 GPa (above threshold of formation of heterogeneous deformation bands). When reducing SW intensity to 27 GPa, spall strength is restored. Duration of the softened copper state does not exceed ∼ 0.5 μs. The method for spall strength evaluation is based on measurement of maximum damage in post-test samples.