Shock compression and isentropic expansion of porous samples of tungsten, nickel, and tin

The isentropic expansion is investigated of shock-compressed porous samples of tungsten, nickel, and tin from the states on shock adiabats at a pressure of $60$–$150$ GPa to states realized under conditions of release into air. The obtained data are compared with the results of calculations by two wide-range model equations of state.