Reliability analysis for thermomechanical fatigue: a robust design based on the strain/stress interference analysis method

摘要

A reliability analysis protocol is proposed to design structure against thermomechanical fatigue using the strength stress interference analysis. It enables to estimate the risk of failure of cylinder heads under thermal mechanical loading by taking into account the variability of vehicle use by customers and the variability in part production. The method is based on lots of finite element analysis and the description of an analytical equation that makes the link between the global engine loadings and the local cyclic damage on cylinder head fire deck.