13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- Figure 3. Distributions of the average density of the medium at consecutive time moments. High current electron beam irradiation of copper with the electrons energy 1 MeV, the current density 10 kA/cm2, and the pulse duration 50 ns. Figure 4. Depth distribution of the vapor bubbles diameters at the moment just before the fragmentation of the liquid phase. The lower bubbles diameters and, consequently, the larger concentrations correspond to the central region of the energy release zone, in which the tension occurs with the higher strain rate. Zero level corresponds here to the absence of the bubbles. Appearance of the bubbles leads to the decrease of the average density of the two-phase medium (Fig. 3). Concentrations and diameters of vapor bubbles in different layers of the metal differ from
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