面向直升机抗坠毁的新型夹心八边形蜂窝设计、仿真和理论研究

doi:10.7527/S1000-6893.2021.25244

Abstract

Abstract: A novel cored octagon honeycomb with better energy absorption capacity was proposed in this study. First, a theoretical model was established to rapidly predict the platform stress of the cored octagon honeycomb under axial crush. Based on the theoretical model, the influence of the side length of the cored octagonal honeycomb and the embedded square honeycomb on its platform stress and relative density was predicted. In addition, the three-dimensional finite element models of hexagonal honeycombs were developed and simulated under axial crush. The simulation results are validated against the experimental results. Afterwards, on the basis of the validation via the modeling method, the finite element model of the novel cored octagon honeycomb was established, and then the deformation mode and effect of honeycomb geometric parameters on its energy absorption capacity were analyzed based on simulation. The theoretical model was compared with the simulation, exhibiting high accuracy. Meanwhile, the energy absorption capacity between the cored octagon honeycomb and hexagonal and square honeycombs was compared, revealing the advantages of the designed cored octagon honeycomb over common hexagonal and square honeycombs. Finally, the coupled drop simulation of the simplified helicopter cockpit model and the cored octagon honeycomb was conducted. The results of the qualitative analysis show that the cored octagon honeycomb is more suitable for the occasion with high energy absorption capacity requirements than the hexagonal honeycomb. This study can provide new insights into the design of new honeycomb structures.

Key words: cored octagon honeycomb, simulation analysis, theoretical model, honeycomb parameters, energy absorption

CLC Number:

V259

WANG Jiaming, LI Zhigang, LIANG Fangzheng, LIU Wanting, LIAO Jiu, CHEN Fangyu, LI Meng, SHAO Teli. Design, simulation and theoretical study on novel cored octagon honeycomb for helicopter crashworthiness[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(5): 225244-225244.

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Design, simulation and theoretical study on novel cored octagon honeycomb for helicopter crashworthiness

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