Estudo sobre Mecânica do Contato no Desgaste por Deslizamento Alternado em um Contato Cilindro Plano.

Abstract

Different types of wear tests are used to evaluate and improve the tribological performance of equipment. Knowing the behavior of some parameters in these tests is important to evaluate their application and representativeness. The purpose of this work is to analyze the behavior of contact pressure and wear rate in the reciprocating sliding wear test using a cylinder-on-flat contact. This test configuration is little used when compared to the ball-on-flat one, however it has some advantages such as: 1 - softer variation of the contact pressure, 2 - greater contact width. These characteristics are beneficial in the testing of coatings and other surface modifications. The greatest difficulty in its execution is to promote the transversal alignment between the cylinder and the sample. An alignment system was developed. Tests of different durations were carried out to obtain wear and contact pressure. Triboscopic maps of friction coefficient and contact potential of the tests were also analyzed. It was then possible to obtain the contact pressure curves and wear rate throughout the tests; however, no relationship was found between these two variables. The variation of the wear rate could be attributed to other factors acting on the tests.