Kostyantyn Chumak

Bio: Kostyantyn Chumak is an academic researcher from National Academy of Sciences of Ukraine. The author has contributed to research in topics: Thermoelastic damping & Thermal conduction. The author has an hindex of 5, co-authored 14 publications receiving 86 citations. Previous affiliations of Kostyantyn Chumak include National Academy of Sciences.

Thermoelastic contact of half-spaces with equal thermal distortivities in the presence of a heat-permeable intersurface gap

Abstract: We consider the interaction of elastic half-spaces with equal thermal distortivities in the presence of a heat-permeable medium in an intercontact gap caused by a recess on the surface of one of the bodies. Outside the gap, a perfect thermal and frictionless mechanical contact takes place between the bodies. Using the method of functions of intercontact gaps, the formulated contact problem is reduced to a singular integral equation for a derivative of the height of the gap, which is solved analytically, and to a Prandtl-type singular integro-differential equation for the difference of temperature of the surfaces in the region of the gap, for the solution of which we propose an analytic-numerical approach. Plots illustrate the influence of load and the thermal conductivity of the filler on the temperature difference between the edges of the gap, contact stresses, heat flows, and longitudinal strains between the half-spaces.

Thermoelastic delamination of bodies in the presence of a heat-conducting filler of the intercontact gap

Abstract: We propose a method for the solution of a system of nonlinear singular integrodifferential equations of the contact thermoelastic problem of delamination of half spaces in the presence of a heat-conducting filler in the gap formed between the half spaces. The effect of heat conduction in the medium filling the gap on the contact parameters of the analyzed structure is investigated. It is shown that the solution of the posed problem can be not unique for some values of the thermal load and the heat-conduction coefficient of the filler.

Contact problems for textured surfaces involving frictional effects

Abstract: This review is mainly concerned with investigations devoted to periodic contact problems involving frictional effects, which were carried out by scientists from the former Soviet Union and CIS countries. The following class of problems is considered: 2D and 3D problems of frictional sliding contact between elastic and viscoelastic bodies with regular relief; stick-slip contact of bodies with wavy and periodically grooved surfaces; thermoelastic interaction between bodies with regular relief with regard for frictional heating; sliding contact between a surface with regular relief and a viscoelastic layer bonded to a rigid or an elastic foundation; effect of adhesion or incompressible fluid in the gaps on contact parameters in sliding contact between a textured surface and a viscoelastic layer.

Combined effect of surface microgeometry and adhesion in normal and sliding contacts of elastic bodies

Abstract: In this study, models are proposed to analyze the combined effect of surface microgeometry and adhesion on the load–distance dependence and energy dissipation in an approach–separation cycle, as well as on the formation and rupture of adhesive bridges during friction. The models are based on the Maugis–Dugdale approximation in normal and frictional (sliding and rolling) contacts of elastic bodies with regular surface relief. For the normal adhesive contact of surfaces with regular relief, an analytical solution, which takes into account the mutual effect of asperities, is presented. The contribution of adhesive hysteresis into the sliding and rolling friction forces is calculated for various values of nominal pressure, parameters of microgeometry, and adhesion.