Pulse regime of frictional heating with material wear on the nonstationary sliding contact

1998 ◽  
Vol 34 (3) ◽  
pp. 334-337 ◽  
Author(s):  
A. V. Attetkov ◽  
I. K. Volkov
Keyword(s):  
Frictional Heating ◽  
Sliding Contact ◽  
Pulse Regime ◽  
Material Wear

The Fundamentals of Sliding Contact Melting and Friction

1989 ◽  
Vol 111 (1) ◽  
pp. 13-20 ◽  
Author(s):  
A. Bejan
Keyword(s):  
Phase Change ◽  
Friction Factor ◽  
Phase Change Material ◽  
Relative Motion ◽  
Temperature Difference ◽  
Normal Force ◽  
Frictional Heating ◽  
Contact Melting ◽  
Sliding Contact ◽  
Change Material

This paper focuses on the phenomenon of melting and lubrication by the sliding contact between a phase-change material and a smooth flat slider. The first part of the study considers the limit in which the melting is due primarily to “direct heating,” that is, to the temperature difference between the solid slider and the melting point of the phase-change material. It is shown that in this limit the relative motion gap has a uniform thickness and that the friction factor decreases as both the normal force and the temperature difference increase. The second part considers the limit where the melting is caused mainly by the frictional heating of the liquid formed in the relative motion gap. This gap turns out to have a converging-diverging shape that varies with the parameters of the problem. As the normal force increases, a larger fraction of the melt is pushed out through the upstream opening of the relative motion gap. Means for calculating the melting speed, the friction factor, and the temperature rise along the slider surface are developed.

Pressure Distribution for Patchlike Contact in Seals With Frictional Heating, Thermal Expansion, and Wear

1976 ◽  
Vol 98 (4) ◽  
pp. 596-601 ◽  
Author(s):  
S. R. Kilaparti ◽  
R. A. Burton
Keyword(s):  
Thermal Expansion ◽  
Pressure Distribution ◽  
Influence Function ◽  
Frictional Heating ◽  
Leading Edge ◽  
Simultaneous Equations ◽  
Sliding Contact ◽  
Maximum Pressure ◽  
Uniform Pressure ◽  
Deformed State

Sliding contact in seals is known to change at high sliding speed from initially uniform pressure to a deformed state where contact is restricted to small patches of the surface. An earlier analysis of such contact was based upon the assumption of uniform pressure on the small patches. The present study draws upon a thermoelastic influence function to provide simultaneous equations for pressure on subdivisions of the patches. The final result is that at high wear rate (and, consequently, high traversal speed of the patch along the surface of the more conductive body of the contacting pair) the pressure distribution becomes roughly triangular with the maximum pressure toward the leading edge of the patch.

Thermal-Elastic-Plastic Contact Analysis for Rough Bodies With a Semi-Analytical Method

2007 ◽  
Author(s):  
Vincent Boucly ◽  
Daniel Ne´lias ◽  
Michel Brunet
Keyword(s):  
Finite Elements ◽  
Static Loading ◽  
Frictional Heating ◽  
Sliding Contact ◽  
Transient Phenomena ◽  
Elastic Plastic ◽  
Plastic Surface ◽  
Engineering Problems ◽  
Interface Loading ◽  
Vertical Contact

Nowadays, Finite Elements softwares allow the user to model efficiently the contact between two solids. It is though necessary to make numerous assumptions in order to compute a contact in a reasonable time: generally surfaces are smooth and the mesh is too coarse to accurately study transient phenomena. Moreover, friction on the surface is rarely taken into account since models are usually axi-symmetric. This paper presents a semi-analytical formulation that allows computing the contact between two elastic-plastic solids with rough surfaces. The numerical methods used, i.e. the conjugate gradient and the fast Fourier transform allow to refine the mesh drastically. The main advantage of this formulation over Finite Elements method is the much shorter computation times. This model takes into consideration the hardening of material as well as friction and frictional heating at the interface. Loading can be vertical or rolling/sliding. This formulation allows realizing cyclic loadings in order to model numerous engineering problems as running-in, fretting, asperities tugging, as well as electro-mechanical micro-contacts. A comparison is made between the vertical contact (static loading) and the rolling/sliding contact (transient loading) in the case of an adiabatic elastic sphere rotating and pressed against a rough and stationary elastic-plastic surface. The influence of the friction coefficient is underlined.

scholarly journals Nonsteady frictional heating on a sliding contact

2018 ◽  
Vol 226 ◽  
pp. 03030
Author(s):  
Vladimir B. Zelentsov ◽  
Boris I. Mitrin
Keyword(s):  
Integral Equation ◽  
Singular Integral Equation ◽  
Contact Problem ◽  
Half Plane ◽  
Frictional Heating ◽  
Contact Stresses ◽  
Sliding Contact ◽  
Singular Equation ◽  
Static Contact ◽  
Class Of Functions

We consider quasi-static contact problem on frictional heating on a sliding contact of a rotating rigid cylinder and a half-plane. The cylinder is pressed towards the half-plane material. The problem is reduced to solution of a singular integral equation with respect to contact stresses. Solution of the singular equation is looked for in a class of functions limited on the edge, with two additional conditions to determine timedependent boundaries of the contact area. Temperature at the contact and inside the half-plane is determined in terms of contact stresses.

scholarly journals Dynamics of thermoelastic frictional wear of a coating with piezoelectric interlayer

2018 ◽  
Vol 226 ◽  
pp. 03031 ◽  
Author(s):  
Polina A. Lapina ◽  
Boris I. Mitrin ◽  
Tatyana A. Kuznetsova ◽  
Vasilina A. Lapitskaya
Keyword(s):  
Integral Transform ◽  
Frictional Heating ◽  
Sliding Contact ◽  
Problem Solution ◽  
Rigid Punch ◽  
Transform Method ◽  
Frictional Wear ◽  
Integral Transform Method ◽  
Thermoelastic Contact Problem ◽  
Develop Technique

To study dynamics of a coating wear, this paper deals with an uncoupled thermoelastic contact problem on sliding of a rigid punch over the surface of a thermoelastic coating bonded to an electroelastic interlayer, which itself is bonded to an undeformable substrate. Friction, frictional heating and coating wear on the contact is taken into account. The problem solution was constructed by the Laplace integral transform method and was obtained in the form of the Laplace convolutions. Based on the obtained expressions it is possible to develop technique for monitoring of a coating wear on a sliding contact through values of electric current arising in the piezoelectric interlayer.

Sign in / Sign up

Export Citation Format

Share Document