Author(s)

L. Flacelière & F. Morel

Abstract

Probabilistic approach in high cycle multiaxial fatigue: volume and surface effect L. Flaceliere & F. Morel E.N S.MA.,Laboratoire de Me'canique et de Physique des Mate'riaux (LMPW, UMR 661 7, Site du Futuroscope, Futuroscope Cedex, France Abstract In high cycle fatigue, it has been experimentally proved that the stress distribution as well as the size of the loaded sample can change the fatigue strength. The specimen free surface is also known to have an influence. When dealing with multiaxial load conditions those effects still act. In this paper, a multiaxial endurance criterion combined with the weakest link theory is modified to describe the fatigue limit distribution under several load conditions (tension, torsion, rotating bending and plane bending). With this model, all the known effects on fatigue strength can be reflected and the probability for endurance can be adequately predicted for any complex loading. The weakest link theory can also account for the decrease of multiaxial fatigue

Keywords