Multiple Loading Design of Novel Honeycomb-Filled Structure with Negative Poisson's Ratios 2020-01-0504
Thin-walled structures have been widely used in automobile body design because of its good lightweight and superior mechanical properties. For the energy absorbing box of automobile, it is necessary to consider its working conditions under axial and inclined multi-angle collisions. In this paper, a novel honeycomb with negative poisson's ratios is proposed and used as filler for thin-walled tubular structures. Meanwhile, the crashworthiness performances of honeycomb filled structure and corresponding unfilled (thin-walled empty tube) structures under 12 kinds of impact conditions are systematically studied. The results indicate the energy absorption of the honeycomb-filled structure is higher than that of the thin walled empty tubular structure, and the impact angles have significant effects on the energy absorption performance of the honeycomb-filled structure with negative poisson’s ratios. Specifically, the energy absorption of the honeycomb-filled structure decreases as the impact angle increases. Lastly, multi-objective optimizations of the honeycomb-filled structure are conducted, which is based on the radial basis function (RBF) neural networks technique and multi-objective particle swarm optimization (MOPSO) to maximize specific energy absorption(SEA) and minimize initial force(IPF) under multiple loading angles. The optimal parameter matching can improve the performance of the honeycomb-filled structure with negative poisson's ratios in energy absorption. These findings can provide valuable guidelines for the design of filler structures under multiple loading angles.