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Abstract
The work presented in this thesis deals with the formulation of non-asbestos friction materials used in disc brake linings.
In this work, a group of formulations has been prepared from chopped fiberglass, phenolic resin, rock wool, steel wool, Fe3O4, friction dust, carbon graphite, rubber, cashew nut, aluminum oxide, calcium carbonate and quartz with different percentages of barium sulfate using dry method in order to optimize the barium sulfate percentage with which the new formulated friction material could act as a substitute for asbestos in disc brake systems. An experimental investigation of physical, mechanical and tribological properties of the prepared specimens has been done and evaluated. A friction model for a disc brake to take account of the variation of the coefficient of friction with the operating parameters for all formulations has been generated and the dynamic behavior of a suggested disc brake model has been evaluated. The results have been compared with that of commercial brake linings and with related international standards. The study showed good agreement with the standard data and with the previous published works.