The present paper aims to describe the engineering durability design methodology as developed by BMW of hot power train components for both the gasoline cylinder head in aluminium alloys and the hot end components in iron based alloys under thermomechanical fatigue (TMF) conditions. The deformation is described using a viscoplastic model, which in the case for the aluminium alloys is combined with an aging model. The local damage evolution is modelled based on the growth of microcracks with a parameter derived from the J-Integral. Cyclic isothermal and non-isothermal fatigue tests were conducted in order to calibrate the lifetime model. The complexity was limited to a level that the main effects were captured but the analysis of a complex structure was still feasible. The accurate prediction of the variable temperature field is crucial for the success; in the CAE environment the temperature assessment remains the largest uncertainty. An outlook to new upcoming power train components is given.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.