Master of Science in Mechanical Engineering (MSME)
Consideration of wear, an irreversible phenomenon, is a very important criterion in design. The knowledge of wear and its behavior enables one to make major considerations to conceptualize and design efficient machinery components with enhanced performance and reliability. The present work deals with the introduction of a novel approach of correlating wear with the thermodynamic properties of the system. The approach involves relating wear to thermodynamic entropy flow in the system using the laws of thermodynamics. This relation is verified experimentally and theoretically by considering a sliding contact in a disk-on-disk configuration for two sets of contacting materials namely Bronze SAE 40 on Steel 4140 and Cartridge Brass on Steel 4140. Verification of the methodology is achieved by calculating Archard’s wear coefficient using the relationships derived in this thesis and comparing it to values in literature. A theoretical model that simulates thermal response in sliding contact has been developed to theoretically verify the proposed relation. The model is based on the idea that sliding contact of two bodies would result in plastic deformation in the near surface region, that we refer here as the ‘severely deformed region’ (SDR). This plastic deformation results in heat generated in the SDR and subsequently rising the temperature of contacting bodies. The experimental analysis and the theoretical model verify the proposed relation with good agreement. The coefficient of friction has also been calculated and compared with the experimentally measured value.
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Brahmeshwarkar, Susheel, "A Thermodynamic Model for Wear in Sliding Contact" (2006). LSU Master's Theses. 2179.
Michael M. Khonsari