Shape optimization of lattice sandwich panels for enhansing failure load using linear buckling load factor

Abstract

This paper investigate the improvement of the failure load for lattice sandwich panels by using the linear buckling load factor. In our calculation, the lattice panel maximized the initial stiffness is used as a initial structure, and the buckling load factor is optimized by changing struts’ diameter. Also, in order to clarify the effectiveness of this optimization, the failure load was calculated by using the elastoplastic stress analysis, and compared with the buckling results. It has been shown that this approach can be useful for enhancing the failure load of the lattice panel under the small value of the volume constraint. However, when the value of the volume constraint is increased, the failure load of the optimized lattice panel cannot be improved, which is based on the fact that the plastic hinges would be observed at some connection points between strands before the occurrence of elastic buckling.