Influência de parâmetros topográficos no desempenho de aço perlítico em deslizamento lubrificado

Abstract

Railway transport in Brazil is its second largest means of cargo transport, behind only to road transport, transporting more than 500 million tons per year. The train wheel to rail contact system is very important in the operation of the railways, this is a place that receives all the load of the train, so in situations of friction as occurs during curves, there can be a great wear of the system. The wear of these elements generates a great cost for the maintenance of the railroads, besides serving as a barrier for a possible increase of loads or speeds, as these increases result in higher values of friction. The literature indicates that there is a relationship between parameters such as mean roughness (Sa) and the coefficient of friction, as well as studies shows the relationship of other parameters such as Skewness (Ssk) and Kurtosis (Sku). However, there are many parameters that define a surface’s texture and there is no exact relationship between these parameters and their influence on the coefficient of friction and wear. This work aims to find a relationship between roughness parameters and the coefficient of friction and wear for this specific case of the train wheel-rail system, replicating the interaction of this pair through lubricated pin-disk test.