MODELING AND EXPERIMENTAL STUDY OF TEMPERATURE AND WEAR OF COPPER ALLOY

Abstract

Study of wear in complex micro-mechanical components is often accomplished experimentally using a pin on- disc. The present thesis proposes an approach that involves a computationally efficient incremental implementation of Archard’s wear model on the global scale for modeling sliding and slipping wear in such experiments. This thesis comprises of detailed study with regard to the study of wear rate, friction force and coefficient of friction of copper alloy and mild steel with different parameters. It is a general observation that wear resistance is the key factor governing the applicability of the material as per various requirements. There have been a number of attempts to standardize the friction force and coefficient of friction by various committees. The tests were conducted on pin on disk apparatus with a cylindrical pin with flat circular disk placed perpendicular to the surface of the cylindrical pin in end as per ASTM G99. The resulting wear depths obtained from experimental data is verified using finite element based numerical tools ABAQUS6.14 and implementing Archard’s to calculate wear rate . The calculated wear rate from experiments and finite element tools are compared to check their validity. The wear rate was found to be maximum (0.4418mm3/s) for sliding velocity of 5.1m/s at a load of 10kg and minimum (5.95e-4mm3/s) for sliding velocity of 3.4m/s at a load of 8kg. The wear rate was increasing with increase in the load and sliding velocity. The maximum temperature, at load of 10kg with sliding velocity 5.1m/s, was found to be equal to 327K using ABAQUS which has little deviation from experimental value. This will be due to constant value of heat transfer coefficient taken in simulation.