Formation of product macrostructure in unsteady SHS-process

The two-temperature and two-velocity mathematical model of gasless combustion of cylindrical porous samples based on heterogeneous mechanics with allowance for structural and phase transformations is proposed and studied. The basic problems of modeling are discussed. The dynamics of formation of a porous product structure from the ignition stage to the steady regime of combustion is considered. The change of combustion parameters for the unsteady mode is analyzed depending on the diameter of the sample. Structural oscillations resulting in exfoliation of the sample in the unstable combustion mode were revealed.