Multiaxial high-cycle fatigue constraints in structural optimization

The paper deals with parametric optimization of structures subjected to multiaxial high-cycle fatigue. A large number of load cycles corresponding to infinite fatigue life was taken into account in the analysis and optimization. The authors use simplified form of Dang Van’s criterion for fatigue damage estimation. For needs of optimization, a certain transformation pattern of the load time history was assumed, which allowed to considerably accelerate the fatigue analysis process. The proposed methodology has been illustrated by an example of optimization of a car suspension arm. As observed in the computational example, the proposed methodology of optimization allowed effectively to reduce the mass of the studied structure while maintaining its fatigue durability on an established level.