CONTACT INTERACTION OF COMPLEX-SHAPED BODIES WITH ACCOUNT FOR NONLINEAR CHARACTERISTICS OF THE INTERMEDIATE LAYER MATERIAL

The paper describes the analysis of stress-strain state of complex-shaped bodies that come into contact over surfaces of conforming shape. The intermediate layer placed between these bodies has nonlinear properties depending on the load history. These properties may be associated with the microstructure of the surface layers of the materials of the contacting bodies. They can also be determined by the properties of network structure materials, polymers, rubber-like materials, sprays, gaskets, etc. The effect of these properties on the contact pressure distribution is illustrated by the example of hydraulic pistons. It is established that with the change of properties of intermediate layers the character of contact pressure distribution changes together with the locations of minima and maxima of contact pressure. Moreover, the contact area itself changes size and shape. Peculiarities of the stress-strain state of the contacting bodies are also determined. Possibilities of control of contact pressure distributions and stress-strain state of contacting bodies by special choice of intermediate layer properties are established.