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Frictionally excited thermoelastic instability in the presence of contact resistance

Frictionally excited thermoelastic instability in the presence of contact resistance
Frictionally excited thermoelastic instability in the presence of contact resistance
In sliding systems, frictional heating generates a well-known instability above a certain critical speed Vcr, which is a function of geometrical and material properties only. Similar instabilities are known to occur in the static problem, driven by temperature differences, in the presence of thermal contact resistance. Thermal contact resistance at the interface has seldom been considered and gives rise to full coupling of the problem. Generally, the resistance decreases non-linearly when pressure is increased. Here, the critical condition (in terms of heat flux and sliding speed) for the stability of the uniform pressure solution for a half-plane in frictional contact with a rigid wall at fixed temperature is studied for a general resistance function R(p). It is found that the heat flux direction increases the instability as in the case of zero speed, i.e. when directed into the half-plane (which is the only distortive material), whereas frictional heating can have also a stabilizing effect, for a given heat flux, specifically when R(p) + pRprime(p) < 0. Also, an isothermal critical speed has been defined, and the actual critical speed is found to be smaller or larger depending on the temperature difference sign. Longer wavelengths are always more unstable so that the critical wavelength is still dictated by the real size of the system.
thermal contact resistance, thermoelastic instability, hot spotting
0309-3247
351-357
Afferante, L.
697a1eb8-5555-4d60-986c-a68fffb63488
Ciavarella, M.
d5aa6350-b3d4-4a78-a670-9d78242f58c5
Afferante, L.
697a1eb8-5555-4d60-986c-a68fffb63488
Ciavarella, M.
d5aa6350-b3d4-4a78-a670-9d78242f58c5

Afferante, L. and Ciavarella, M. (2004) Frictionally excited thermoelastic instability in the presence of contact resistance. The Journal of Strain Analysis for Engineering Design, 39 (4), 351-357.

Record type: Article

Abstract

In sliding systems, frictional heating generates a well-known instability above a certain critical speed Vcr, which is a function of geometrical and material properties only. Similar instabilities are known to occur in the static problem, driven by temperature differences, in the presence of thermal contact resistance. Thermal contact resistance at the interface has seldom been considered and gives rise to full coupling of the problem. Generally, the resistance decreases non-linearly when pressure is increased. Here, the critical condition (in terms of heat flux and sliding speed) for the stability of the uniform pressure solution for a half-plane in frictional contact with a rigid wall at fixed temperature is studied for a general resistance function R(p). It is found that the heat flux direction increases the instability as in the case of zero speed, i.e. when directed into the half-plane (which is the only distortive material), whereas frictional heating can have also a stabilizing effect, for a given heat flux, specifically when R(p) + pRprime(p) < 0. Also, an isothermal critical speed has been defined, and the actual critical speed is found to be smaller or larger depending on the temperature difference sign. Longer wavelengths are always more unstable so that the critical wavelength is still dictated by the real size of the system.

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More information

Published date: 2004
Keywords: thermal contact resistance, thermoelastic instability, hot spotting

Identifiers

Local EPrints ID: 23232
URI: http://eprints.soton.ac.uk/id/eprint/23232
ISSN: 0309-3247
PURE UUID: 4074d2a1-f9b1-44ae-ba34-233a20f9e696

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Date deposited: 23 Mar 2006
Last modified: 19 Jul 2019 19:10

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Contributors

Author: L. Afferante
Author: M. Ciavarella

University divisions

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