Since 1978
Published in Sarov (Arzamas-16), Nizhegorodskaya oblast

RUSSIAN FEDERAL
NUCLEAR CENTER -
ALL-RUSSIAN RESEARCH INSTITUTE
OF EXPERIMENTAL PHYSICS
 
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EQUATION OF STATE FOR GRAPHITE AND DIAMOND

A. H. Averin, A. T. Sapozhnikov
VANT. Ser.: Mat. Mod. Fiz. Proc. 1995. Вып.3. С. 9-14.

      An equation of state is proposed for graphite and diamond to compute the pressure and specific internal energy from density and temperature. The pressure and energy are thermodynamically consistent. The potential components of pressure and energy are described using Born-Meyer theory. The Gruneisen coefficient depends only on density for diamond and on temperature for graphite.      The equation of state describes well the experimental data on shock compressibility, heat capacity, thermal expansion and phase equilibrium. It can be used in computational models and codes for graphite-diamond phase transition under dynamic leads.



MATHEMATICAL MODEL FOR POROUS MEDIUM DYNAMICS

A. T. Sapozhnikov, P. D. Gershchuk
VANT. Ser.: Mat. Mod. Fiz. Proc. 1995. Вып.3. С. 25-32.

      A semi-empirical model is proposed to describe the pressure ш the porous medium under deformation and heating. The model reflects the basic experimental behavior features of porous material under deformation.
      The algorithm is given for numerical integration of the energy conservation law for porous medium in terms of viscosity and energy release. 1 lie formulas are proposed for the calculation of the shift modulus, bulk modulus, dynamic strength yield and spalling resistance of the porous medium.
      The model is intended for the program implementation of solid and porous medium dynamics. The model capabilities are demonstrated through the description of properties of carbon and some metals. The computational results are given for the impact of a thin plate against porous copper layer.










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