Modelling the effect of impurities on incubation and short crack growthTuesday (26.05.2020) 16:00 - 16:40
The design of new metallic materials with increased fatigue resistance is based on a quantitative understanding of microstructural influences on cyclic properties. The microstructure-sensitive fatigue modelling concept is, therefore, a key contribution to the development of new material design approaches beyond reducing the amount and maximum size of impurities.
In the contribution, the concept of microstructure-sensitive fatigue modelling will be introduced and discussed. Special emphasis is laid on the generation of statistically representative volume elements and the crystal plasticity models. Afterwards, the strategy to derive macroscopic cyclic properties from fatigue simulations is presented. Finally, a case study reveals that the residual stresses around inclusions which stem from the thermomechanical processes of material production play a vital role for the fatigue performance of the material. A strategy of residual stress consideration is therefore developed as well.