New honeycomb multi-stage thin-walled structure with high efficiency energy absorption characteristics
The existing thin-walled structure has the problem of low specific energy absorption and low compression efficiency.The honeycomb was used as a prototype to simulate the multi-level nested structure of honeycomb and the optimization design of bionic structure was carried out.In order to better explore the influence of shape parameters on energy absorption capacity,a total of 20 honeycomb multi-stage thin-walled structures were designed based on the relative rotation angle and the diameter of the reinforced column.Using 3D printing technology,a multi-stage thin-walled structure sample of imitation honeycomb made of nylon was prepared,and a quasi-static compression test was carried out.Finally,the numerical simulation results and experimental results are compared and analyzed,and the following conclusions are drawn:the model with the strongest energy absorption capacity in this paper is YMT20-3.6,reaching 10.87 J·g-1,which is about 86％higher than that of the initial model YMT0-0.The larger the rotation angle,the larger the diameter of the reinforcement column,the more uniform the distribution of the cross-sectional area of the model,the symmetrical deformation mode of the model,and the stronger its energy absorption capacity.A larger rotation angle has better energy absorption,but its compression force efficiency is less.Increasing the diameter of the model strengthening column can reduce the influence of rotation angle on the compression force efficiency and improve the compression force efficiency of the model,so as to obtain a thin-walled structure with strong energy absorption capacity and high compression force efficiency.
bionic designmulti-level structureadditive manufacturingefficient energy absorption
万方数据
维普
