Topology optimization of lattice-core sandwich beams for energy absorption

In this article, the effect of topology optimization of lattice-core sandwich beams as energy absorbers is investigated using ABAQUS software. The samples include two types of lattice cores crafted from expanded metal sheets, with three different cell orientations. For the experiments, the samples are subjected to low-velocity impact tests to simulate transverse loading. To eliminate inefficient cells and perform topology optimization, the Solid Isotropic Microstructure with Penalization method is utilized. Next, Specific Energy Absorption (SEA) is investigated as the test objective. This type of energy absorber has various applications in different industries, including aerospace, automotive, railway, and shipbuilding. Based on the results obtained from experiments and simulations, the significant effect of topology optimization in improving SEA is concluded. An experimental three-point bending test demonstrates an increase in SEA for a sandwich beam with topology optimization in the range of 45-94%. Furthermore, an approximate 90% increase in SEA can be achieved with a suitable cell orientation. Finally, optimal topologies for three volume fractions, considering the desired criteria, are presented.

Automated summary

This article investigates the effect of topology optimization on lattice-core sandwich beams as energy absorbers using ABAQUS software. Two types of lattice cores crafted from expanded metal sheets with three different cell orientations are studied. The Solid Isotropic Microstructure with Penalization method is employed for topology optimization. Results from experiments and simulations demonstrate significant improvement in Specific Energy Absorption (SEA) with topology optimization. The study also presents optimal topologies for three volume fractions based on desired criteria.