铝蜂窝的动态力学性能及影响因素

Dynamic mechanical properties of aluminum honeycomb and its effect factors

采用显式动力有限元方法研究了具有不同胞元结构的六角形铝蜂窝在冲击荷载下的力学性能,讨论了铝蜂窝的变形模式和动态承载力以及影响因素。通过改变胞壁夹角得到5种不同的胞元结构,计算采用了3种冲击速度。结果表明,在准静态变形模式下,胞元的几何因素对铝蜂窝的承载力起主导作用;一旦蜂窝的变形呈现动态模式后,惯性效应显著,对蜂窝承载力起决定作用,胞元几何因素的影响不再明显;在过渡模式下,惯性效应与几何因素共同主导蜂窝的动态承载力,并且冲击速度越高,惯性效应的影响越大。

The dynamic mechanical properties of hexagonal aluminum honeycombs with various cell configurations are studied by employing the explicit dynamic numerical simulations. The deformation mode and the crushing strength of the honeycombs, as well as the influence factors are discussed. Five kinds of cell configurations are acquired by changing the cell-wall angle, and three levels of im- pact velocity are involved in the numerical simulations. The results show that under the quasi-static deformation mode, the crushing strength of the honeycombs is dominated by the cell configuration. Once the honeycomb＇s deformation turns into the dynamic mode, the inertia effect is notable and be- comes the deciding factor of the honeycombs＇ crushing strength, while the influence of the cell config- uration is inconspicuous. Under the transitional mode, the crushing strength of the honeycombs is de- termined by both the inertia effect and the cell configuration simultaneously. Moreover, the higher the impact velocity, the more significant the proportion inertia effect.