Effects of Process Parameters on the Ultimate Tensile Strength of Coconut Shell Reinforced Friction Lining

Abstract

In this study, friction linings were producee from non-hazardous materials using response surface methodology (RSM) experimental design. The materials used for production include coconut shell, epoxy resin (binder), graphite (friction modifier) and aluminium oxide (abrasive). Twenty- seven different samples of percentage composition were produced by varying the process parameters. Formulation of the friction lining samples was done using rule of mixture and a weight percent of 52 % reinforcement, 35 % binder, 8 % abrasive and 5 % friction modifier were used for the production. Analysis of variance shows that curing time (31.404 %) has the most significant effect on the ultimate tensile strength of the coconut shell reinforced material. Optimal process parameters obtained from signal to noise analysis shows an optimal value of moulding pressure (10 MPa), moulding temperature (180 oC), curing time (8 minutes) and heat treatment time (5 hours). Empirical regression model was also developed to predict the value of coefficient of friction of the materials. Optimal value obtained for coconut shell reinforced materials show an ultimate tensile strength of 4.809 MPa.