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The shock response of powdered aluminum compacted by a driver plate was simulated with a one-dimensional Lagrangian continuum mechanics computer program. The porous aluminum was mocked up by a series of flat plates separated by gaps to obtain an initial density of 1.35 g/cm 3 for the "powder." The compaction process was followed in detail for two cases of driver-plate conditions corresponding to two Stanford Research Institute experiments. The calculations showed an approach to equilibrium behind the shock in each of the porous samples. The equilibrium states established were found to be consistent with the Rankine-Hugoniot jump conditions applied to aluminum of density 1.35 g/cm 3 • These states did not lie on the Hugoniot curve of solid-density aluminum. This was shown to be due to the significant internal-energy dependency in the equation of state. The calculated results were in good agreement with the SRI experiments. Application of this computational model to more complex cases is indicated.