ANALYSIS OF THE RANGE OF THE SPECIFIC HEAT OF TRIBOLOGICAL WEAR PRODUCTS

Abstract

This paper continues a discussion of specific heat cp’ of wear product material at the time of the products’ generation which was initiated in [L. 2]. The very high values of this quantity found on the basis of the laws of mass and energy conservation have inspired further analyses to possibly validate the results. System quantities C and D [L. 2] have played central roles in earlier modelling of the friction and wear of solids. They are determined for a certain range of the temperature of a macroscopic contact of solids Θ and serve the purpose of a merely approximate estimation of minimum cp’. An attempt at determining real values of cp’ for specific Θ without taking C and D into consideration has been undertaken in this study. The discussion was based on the energy balance equation for the stationary friction process which is associated with wear. The significance of friction parameters, the physical properties of a material subject to friction, and some characteristics of the tribological system have been emphasised. The analysis is also designed to determine maximum heat, cp’max, and a range of its variations, cp’min - cp’max. The resultant analytical dependences that characterise friction and its effects are illustrated with examples of selected experiments [L. 10], which were originally designed to estimate values of cp’ [L. 2]. The evaluation of cp’ discovers negligible differences between cp’ and cp’min. Important information has additionally been acquired about the values of the flash temperature, Θo, and its relations to temperature D. No regular impact of on the specific heat of wear products has been determined.