Fatigue analysis with local stress approach; considering influences fromproduction, material imperfection and other influences

Gerhard Spindelberger
Magna Powertrain

Fatigue life analysis of deterministically loaded components based on Finite Element results is already state of the art in automotive engineering and other disciplines of mechanical engineering. However, realistic loads are more randomlike or purely probabilistic. Therefore the necessity of fatigue life assessment of stochastically loaded components becomes more and more important, which requires reformulation of fatigue hypotheses using probabilistic theory. In this contribution the process and methods will be described, how to obtain local damages from multiaxial loads described by power spectral densities. A practical example will demonstrate the applicability of these new methods, which have been implemented into the commercial fatigue solver FEMFAT.