Modeling of dynamic compression of porous iron

A relation closing the model of a porous medium, which is based on the Maxwell representation of the irreversible strain mechanism, has been obtained. This model takes into account the effect of grain (particle) size on dynamic compression. To specify the model, use is made of the experimental data on uniform compression of specimen of porous iron. The shock adiabats have been calculated. The obtained results are compared with the data of independent experiments. The evolution of compression pulses of finite duration which propagate over a porous half-space is analyzed. The grain size is shown to affect the shock wave processes in a porous medium. It has been established that it is possible to estimate the stress (pressure) in a decaying shock wave by the known mass velocity and shock adiabat.