Influence of Operating Parameters on the Performance of Friction Composites Based on Combinations of Rock Fibers and Organic Fibers

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Abstract
The dynamic frictional response of a multicomponent friction composite is highly complex under a set of variable loads and speeds. The present paper discusses the sensitivity of friction and wear behavior to braking pressure and sliding speed of four selected composites based on a variation of combinations of rock fibers (Basalt and Lapinus) and organic fibers (Aramid and PAN). The studies on the sensitivity of μ and wear to the operating variables were carried out with the help of a pad-on-disc type tribo-test-rig following 4 loads × 3 speeds experimental design. Regression analysis of the μ values following an orthogonal L9 (3 × 3) experimental design method revealed that the first-order influences of braking pressure and sliding speed were significant while the contribution of their mutual interaction was minor. It was observed that aramid fiber proved most beneficial in modifying the selected performance properties except friction stability at higher pressure and speed conditions. Lapinus proved to have an edge over basalt in most aspects. The SEM studies on the worn-pad surfaces revealed the role of contact patches and differential topographic attributes in controlling the friction and wear performance of these composites.