A Transient Heat Transfer Model for Assessment of Flash Temperature During Dry Sliding Wear in a Pin-on-Disk Tribometer
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TRODUCTION
THE pin-on-disk wear test is today a popular method for assessing the wear behavior of a material in laboratory due to its versatility in scientific investigation of the micro-mechanism of wear. This device consists of a cylindrical pin (the specimen) which is in direct contact with a rotating disk. The heat generated due to friction at the contact surface between pin and disk raises the temperature of pin-disk contact surface. Indeed, the pin-disk contact surface temperature (called ‘Flash temperature’) has an intense effect on the wear rate of the pin. The tribological behavior of the material significantly depends on the flash temperature, which is related to normal load, sliding velocity, and the nature of rubbing surfaces (pin and disk). Usually at higher load, the flash temperature increases to a significant extent owing to higher level of frictional heat generated at contact surface. As a consequence, significant oxidation of the pin surface would occur. If the oxide layer is non-adherent, it is readily removed by the abrasive action of the disk and a rapid oxidative wear takes place. However, when the oxide layer is adherent, it acts as solid lubricant that prevents the rubbing surfaces to be in direct contact.[1] This eventually reduces the wear loss to a considerable extent. Therefore, the assessment of flash temperature in relation to surface oxidation is of utmost necessity in order to understand micro-mechanism of wear.
MANAS KUMAR MONDAL, Assistant Professor, and JOYDEEP MAITY, Associate Professor, are with the Department of Metallurgical and Materials Engineering, National Institute of Technology, Durgapur, West Bengal 713209, India. Contact e-mail: [email protected] KOUSHIK BISWAS, Associate Professor, is with the Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, West Bengal 721302, India. Manuscript submitted October 9, 2014. Article published online November 5, 2015 600—VOLUME 47A, JANUARY 2016
Many analytical models have been proposed to calculate the flash temperature. In this regard, Jaeger[2] calculated temperature rise solutions for sliding between two semi-infinite planes of different geometrical configurations by considering that heat is liberated at constant rate per unit time per unit area over the instantaneous surface of contact. Bowden and Tabor[3] developed similar equations for predicting the temperature rise for an infinitely long fin being heated at one end, with ambient air taking part of the heat away from the pin wall at a velocity equal to that of the disk. Kar and Bahadur[4] calculated the rise in temperature due to frictional heating between a stationary cylindrical pin and a rotating disk by solving 2D steady heat transfer equation in cylindrical coordinates for the disk and 1D steady heat transfer equation for the pin using periodic heating boundary condition at any point on the disk periphery. Chapovska et al.[5] developed an analytical model in quasi-steady state to find the distribution of heat between a vertical stati
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