Abstract
In order to clarify the influence of applied normal load, relative sliding speed, surface roughness and materials Young's modulus and their cross influence on friction coefficient an analytical model is developed based on experimental results for obtaining friction function using response surface methodology. The friction coefficient (CoF) with the variation of the factor levels are investigated experimentally on a micro-tribometer machine. The design is performed using response surface method (RSM). The coefficient of friction (CoF) with the variation of the factor levels are investigated experimentally on a micro-tribometer UMT-2 machine. The machine is used to measure the friction force, normal force and the CoF. The second order mathematical model, in terms of the factors, was developed for the coefficient of friction (CoF) using response surface methodology (RSM). The significance of these factors on the CoF has been established with the analysis of variance. It is found that the relative sliding speed, surface roughness, quadratic term of the load, quadratic term of the speed, the interaction between the materials Young's modulus and roughness are significant model terms. An attempt has also been made to optimize the coefficient of friction and to find a region of the factors space in which operating requirements of CoF are satisfied.
