Simulation of the Stress-Strain Gradient Effect to Design Safe Components Against Multiaxial Fatigue*

Abstract This paper deals with the design philosophy against fatigue which is developed at the laboratory of the authors to take the stress-strain gradient effect into account. A deterministic energy based multiaxial fatigue criterion using the concept of volume influencing fatigue crack initiation is presented. Then, to estimate the probability distribution of the fatigue limit for metallic components, the weakest link concept has been combined with the previous non- local model. Finally, a volumetric multiaxial fatigue life calculation model is presented. This non-local approach gives good results on smooth and notched specimens made of two materials (SG cast iron and Ck45 steels) and on a real component.