Theoretical models are widely used for predicting the operational parameters of structural elements and devices as well as quantitative description of the different physical nature fields in solids. Such models must take sufficient account of the structure and properties of the mate-rial, the type of the body surface, as well as the kind of external action.
Proper reflection of the structure of the material and the charac-teristics of the body surface, as well as account of the binding energy is especially important since widespread use in precision engineering and instrumentation, as well as in medicine, of thin films, fibers, thin film layers and coatings, porous nanomaterials, etc. It is known that such objects feature is the proportionality of contributions of surface and bulk factors in internal energy, and the heterogeneity of physical and mechanical fields causes the existence of thermodynamic forces along with the simultaneous absence of thermodynamic flows at equilibrium. In engineering practice, there is generally known the dependence of strength, corrosion resistance, etc. on the roughness (geometric inhomogeneity) of the body surface. Surface and structural non-homogeneities are associated with various size effects, including strength limits, moduli of elasticity, and so on.