Análise do comportamento do desgaste em um sistema pino-disco através de ensaios experimentais combinada com avaliação de pressão de contato por meio de simulação numérica

Abstract

The life of a mechanical component, especially that subjected to dynamic loads is almost always determined by the loading conditions to which it is subject. Alternating stress fatigue, as well as contact stresses, need to receive special attention during the design of a device. Sometimes, this approach is not observed because of the designer’s lack of depth knowledge of certain failure criteria (Von Mises or Tresca), or even by the bigger time spent to a more complete analysis would require. Then, it ends up taking oversizing of components such as design strategy. The problem with this approach is the possibility of getting a more expensive desing or even increase manufacturing complexity. From the observation of the difficulty to consider the criterion of wear within a project, associated with the fact that every mechanical components in sliding contact is susceptible to this phenomenon, it was saw the opportunity to work with the theory of wear associated with existing analysis tools. The purpose of this work includes applying the wear volume measured to calculate the stress field in the instant that the test body is subjected. To achieve this target, it was used the combination of two tools: experimental analysis and finite element method (FEM). The integration between these two tools was made by adopting the wear model proposed by Archard wear. Model in which the wear volume is associated with the distance traveled during the test and the contact pressure between the test bodies. The FEM applied supplied pressure fields to enable the calculation of the wear coefficient that varies with the passing of the test. The analysis was restricted to the sphere contact (aluminum) against disk (AISI D2 alloy steel hardened and tempered). The results obtained were satisfactory and show that the method is feasible, since, from the use of Archard model, it is possible to describe well the wear coefficient variation throughout the test.