Influência da porosidade no módulo de elasticidade de um material compósito com foco na indústria de materiais de fricção

The propose of this work is to investigate the correlation between porosity and modulus of elasticity in friction materials, focusing on the infl u- ence of the amount and type of fi ber used, in order to propose a mathematical model that correlates these two properties. The proposed model was de- veloped based on the modifi ed Law of Mixtures (Al-Qureshi, 1988) and includes the equations pro- posed by Spriggs (1961) and Kingery et al. (1976). A composite with a binder and a reinforcement ele- ment was analyzed to simplify the model. In order to use common materials in the friction industry the experiments have been carried out with phenolic resin as a matrix and two types of fi ber as a rein- forcement element: fi berglass and aramid fi ber. The composites analyzed were separated in 2 groups ac- cording to the fi ber used and the percentage of fi ber was varied within these groups. Based on the exper- imental results, the use of the proposed model was verifi ed, which demonstrated satisfactory results.