Journal of Theoretical
and Applied Mechanics

48, 3, pp. 567-578, Warsaw 2010

Two-stage optimization method with fatigue constraints for thin-walled structures

Mirosław Mrzygłód
The paper describes a two-stage approach to optimization of thin-walled structures. The optimization procedure takes into consideration high-cycle fatigue constraints. Hence, Dang Van's criterion for fatigue damage estimation is used. In the first stage of optimization, a parametric model and evolutionary algorithms are used. The topology optimization method is applied in the second stage. The work is illustrated by an example of optimization of a thin-walled mechanical structure subjected to high-cycle load conditions. In both stages of the optimization, the same parametric FE model, boundary conditions and constraints were used. The topology optimization applied in the second stage of optimization significantly improved the final result. The optimization methodology allowed to effectively lower the mass of the structure maintaining its durability on an established level.
Keywords: thin-walled structures; fatigues constraints; topology optimization