03-19U

The review of different methods for calculation of physical characteristics (conductivity and thermal conductivity, dielectric and magnetic permeability, elastic constants and linear expansion coefficient) of composite materials is presented. The universal cluster approach for their calculation is suggested. It is available for approximate solution of linear differential equations with chaotic coefficients, which contain the information about space distribution of inclusions. Even the first cluster approximation for matrix composite both in self-consistent approach generalize set of results, known in literature for two-phase system on any number of phases.It is supposed to use this approach for calculation of internal strength in lava-like fuel-containing materials.