An online algorithm for temperature influenced fatigue–life estimation: strain–life approach

This paper presents an online temperature modified strain–life approach based on temperature modified pseudo-elastic stress filtering and rainflow counting. Local temperature–stress–strain behaviour is modelled with an operator of the Prandtl type. The hysteresis loops are supposed to be stabilized and no creep is considered. To gain material parameters at temperatures not measured, linear parameter interpolation is introduced. Temperature influence upon fatigue damage accumulation is demonstrated with an example. The algorithm presented enables quick and improved fatigue life estimation with no or low experimental effort needed to obtain material and cyclic stress–strain parameters.