Michell Truss : Effect of Shape Optimization upon Durability Evaluation

Abstract

The shape optimization has an effect of leveling stress distribution in the structures of many types, and the reduction of the peak stress amplitude has an influence on the improvement of its durability. The leveling effect of the shape optimization is investigated, on the stress distribution of the Michell truss under the dynamic loading with sweep excitation. The number of troughs and peaks can be divided into 2(two) groups, i.e. troughs and peaks with elastic strain only, and troughs and peaks with plastic strain accumulation, which leads us to apply the Palmgren-Miner rule directly. In this paper, the effect of leveling stress distribution in the Michall truss is reported, regarding the improvement of durability evaluation.