In the work the problem of experimentally-theoretical definition of adhesive interaction level of phases in the disperse-filled polymeric composites is discussed. It is shown, that character of this interaction defines not only distribution of the stress-strain state parameters of a composite near to the contact borders but also assigns a type of the stress-strain curve. Moreover, at delaminating inclusions from a matrix an occurrence of a corresponding response on the curve is provided. It is offered to apply that for an estimation effective value of adhesion with its further use for numerical experiments with reference to computer-aided design of the fiber reinforced composites.