Estimate the risk with residual service life of rolling stock

In this paper we use Fuzzy set method to solve one of the important problems in mechanical engineering (risk when extend the service life). The residual service life for rolling stock can change depending on it's using conditions. The Paper offer's a new method depending on fuzzy set method by using the material mechanical and chemical corrosion mathematical model to determine the residual service for rolling stock with the value of risk of it's usage in future.