Mechanical properties, strength physics and plasticity

Specific features of the damage nucleation stage under severe loading of copper

Yu. V. Bat'kov^a, O. N. Ignatova^a, I. N. Kondrokhina^a, A. N. Malyshev^a, S. S. Nadezhin^a, A. M. Podurets^a, V. A. Raevskii^a, V. I. Skokov^a, O. A. Tyupanova^a, Marvin A. Zocher^b, Dean L. Preston<sup>b

a</sup> Federal State Unitary Enterprise "Russian Federal Nuclear Center — All-Russian Research Institute of Experimental Physics", Sarov, Nizhny Novgorod region
^b Los Alamos National Laboratory, Los Alamos, USA

Abstract: The nucleation and evolution of damage in annealed coarsely crystalline M1-type copper subjected to fast loading to a pressure $P\sim$ 32 GPa, followed by the action of tensile stresses $\sigma_p$ with an intensity of $\approx$ -2.0 GPa for a time $t\approx$ 0.3–1.5 $\mu$s, have been investigated numerically and experimentally. It has been shown that, at a specific combination of amplitude-time characteristics of the tensile stress pulse, damage localization in some cases at $t <$ 1 $\mu$s has been observed in zones ($\sim$10–14 mm in size) alternating with “dead” zones ($\sim$3–5 mm in size) containing no visible damages. Pores are connected by “yield streamlets”. The existing multistage models of fracture kinetics have neither explained nor predicted the formation of a “band” damage structure or the presence of “yield streamlets” in specimens.

Received: 30.09.2010

 English version: Physics of the Solid State, 2011, 53:4, 768–772

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