Evaluation of flash temperatures of a composite elastomer tip seal with a dry sliding conditions in contact with a high carbon steel plate

This source preferred by Mark Hadfield

Authors: Tzanakis, I., Hadfield, M., Georgoulas, A. and Kotsovinos, N.

Start date: 21 September 2011

One of the most important issues in dry sliding contact is the frictional heat generated. This study investigates the flash temperatures caused by frictional heating of sliding parallel pairs: a high performance fluoroelastomer composite with a high carbon steel plate. These materials have industrial applications and in particular as the main contacting components within a scroll expander system. The expected flash temperature values of the studied contacts are important to be revealed in order to accurately predict the wear mechanisms associated with excessive contact temperatures caused by sliding friction. Flash temperatures are generated by the asperities contact of the tested materials and the elevated thermal effects. A realistic model which can estimate the change increment of flash temperatures is developed. Initially a numerical analysis is conducted using conventional mathematical methodology. Analytical results of the specific contact using finite elements analysis methods were also produced. The numerical and analytical findings are then compared with physical experimental observations produced with a high- precision thermal camera integrated with a sliding micro-friction machine. In conclusion, maps are produced indicating interesting correlations within the flash temperatures and the experimental conditions. A rational and coherent interpretation of the flash temperature effects on the actual tribological contact is discussed.

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Authors: Tzanakis, I. and Hadfield, M.

Journal: WIT Transactions on Engineering Sciences

Volume: 71

Pages: 3-14

ISBN: 9781845645304

ISSN: 1743-3533

DOI: 10.2495/SECM110011

One of the most important issues in dry sliding contact is the frictional heat generated. This study investigates the flash temperatures caused by frictional heating of sliding parallel pairs: a high performance fluoroelastomer composite with a high carbon steel plate. These materials have industrial applications and in particular as the main contacting components within a scroll expander system. The expected flash temperature values of the studied contacts are important to be revealed in order to predict the wear mechanisms associated with excessive contact temperatures caused by sliding friction. Two different roughness profiles of the high carbon steel plate were used. The flash temperatures generated by the asperities contact of the tested materials were investigated as a function of the friction coefficient, the applied pressure and the sliding velocity, using a reciprocating tribometer. Initially physical experimental observations of the specific contact produced with a high- precision thermal camera integrated with a sliding micro-friction machine were conducted. Analytical results using conventional mathematical methodology were also produced. The analytical and experimental findings were then compared indicating interesting correlations within the flash temperatures and the experimental conditions. The most influential parameter for the flash temperature rise is determined. © 2011 WIT Press.

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