Modellering av termomekaniskt belastade räls- och hjulstål

Forskningsprojekt, 2013 – 2019

Rail and wheel materials are subjected to very high stresses and, in some cases, also to elevated temperatures. The rolling contact loading results in a multiaxial stress state with a combination of compression and shear. The temperature may increase due to frictional heat generated between wheel and rail or generated between wheel and brake blocks at tread braking. This further increases the complexity of the loading situation. Also additional material responses and deterioration phenomena may come into play. The main goal of project MU32 is to improve modelling of the cyclic behaviour of wheel and rail materials subjected to mechanical and thermal loadings. The project will be conducted in close collaboration with project MU28. In MU28 tests will be performed on pearlitic steels at elevated (and possibly varying) temperatures for uniaxial as well as compression–torsional loading. The resulting knowledge on how the material behaves in realistic loading situations can be used in the current project to formulate, calibrate and validate material models. The project will also interact with project SD10 where simulations of the contact between brake block and wheel including temperature elevation will be studied.