Stability Analysis of Long Hexagonal Aluminium Honeycomb Under Axial Impact Load Based on Finite Element Method

Aluminium honeycombs are widely used in the field of collision buffering. Its energy-absorption capacity is determined by platform force and height, but when the height exceeds a certain value, the aluminium honeycomb will buckle as a whole rod, and its energy-absorption capacity will be lost. The buckling of long aluminium honeycomb is analyzed in this study. First, a finite element model of an aluminium honeycomb is established, and the global buckling height of the honeycomb is obtained by simulation. Then, based on the response surface method, the relationship between the global buckling height of the honeycomb and its cell side length and wall thickness is obtained. A parameter to measure the stability of the aluminium honeycomb under axial compression, namely, the height stability coefficient, is proposed, and the relationship between the coefficient and the cell side length and wall thickness under a predetermined platform stress is analysed. The results show that the wall thickness has a greater influence on the stability. This research has significance for improving the impact buffering effect of aluminium honeycombs.