Influence of first and second phase transitions on the form of shock adiabate in condensed bodies

The crossing range of a shock adiabate and a melting curve has been considered. The melting curve has been presented by Simon equation. The effect of a first kind phase transition on the form of the shock adiabate has been studied as in the case when the shock adiabate of the solid crosses its melting curve. The crossing of the adiabate of solid and the melting curve determines the beginning of melting state. The crossing of the adiabate of a liquid and melting curve determines the state of the melting termination. The crossing of the shock adiabate and the critical isotherme of a date substance is the example of the effect related to the second kind phase transition on the form of the shock adiabate. The generated model illustrates the behavior of low-melting metals: Pb, Bi, Cd and Sn II. The experimental data of the shocked substances has been analyzed. It is noted that the singularities in change of properties vs temperature possess place upon the critical temperature. The model results have been confirmed by the well-known experimental data. The crossing of the shock adiabate of solid and the melting curve produces a discontinuity of the shock adiabate. A derivative of shock velocity on particle velocity in a liquid range decreases. The crossing of the shock adiabate and the critical isotherme produces a break of a relationship of the shock-particle velocities. The singularities in a change of the properties vs the temperature take place whenever the crossing of the shock adiabate and the critical isotherme is present. There following singularities occur: a break curve, a curve bend, a minimum and a maximum.