Physical metallurgy and computer simulation methods were used to study the propagation and interaction of shock waves in steel balls subjected to convergent dodecahedrally symmetric shock waves with the pressure 50-200 GPa. Conditions for the energy cumulation and realization of the regular and the irregular type of interaction of shock waves were studied. Based on the results of microstructural investigations of intact samples, parameters of the shock-wave loading were calculated such as the pressure, the residual temperature, the time of isentropic flow of the substance under load, and the pressure profile behind the shock-wave front.
The Mach (irregular) regime of the waves interaction was realized in the steel ball of diameter 40 mm [1]. Based on the obtained experimental data, the thermodynamic parameters of the shock-wave loading for this ball (R_sp/R_expl = 1/2, R_sp - the ball's radius, R_expl - the thickness of explosive layer on the ball's surface) were calculated. When simulating the shock-wave motion, we used the real geometry of the bound-aries of contact discontinuity (Altshuller patterns).
The regular regime was realized in 60-mm steel balls (R_sp/R_expl = 3/4). A computer simulation of the shock-wave motion based on the results of a metallographic investigation of microstructural changes in the loaded material permitted us to reconstruct the pic-ture of the shock-wave motion and describe the spatial distribution of pressures in the ball and to restore the pressure profile of the interacting shock waves [1].
This investigation was carried out with bounds of Presidium of the RAS program "Thermal physics and mechanics of intensive energy influence"

1. Kheifets A.E., Zel'dovich V.I., Litvinov B.V., Purygin N.P. et al, Analysis of Propagation and Interaction of Shock Waves in Steel Balls Based on Microstructure Changes, The Physics of Metals and Metallography, 2000, vol. 90, Suppl.1, pp.S108-S123.

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