A three-phase model including a practically incompressible matrix, an interface layer and a filler (schungite particle) is presented together with its analytical-numerical implementation for composite materials with scale effect of strengthening when reducing the sizes of particles. Based on the model, were carried out a series of computations for determining effective Young and bulk deformation moduli of composite materials filled with particles of inclusions of various radii. It is shown, that the estimates of the effective moduli agree satisfactorily with the results of experimental analyses and demonstrate a marked trend of scale strengthening for this type of composite materials.
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