铝蜂窝夹芯板低速动态冲击响应研究

为研究不同结构参数对质量相同、强度不同的两种铝蜂窝夹芯板低速动态冲击响应的影响，建立了铝蜂窝夹芯板受半球型落锤低速冲击的数值模型，并将有限元计算结果与试验结果进行对比，检验了模型的可靠性。在此基础上，对比研究了不同上下铝板厚度和不同蜂窝芯壁厚对两种铝蜂窝夹芯板在低速冲击下吸能效果的影响。结果表明：在质量相同的情况下，强度小、高度大的夹芯板在低速冲击下力-位移曲线更易出现双峰模式，增加蜂窝芯壁厚或是上下铝板厚度都会使第一次的峰值力增加，第二次峰值力降低；强度小、高度大的夹芯板蜂窝芯在低速冲击中吸能占比更多，强度大、高度小的则是上层铝板吸收的能量更多，前者的质量、体积比吸能更高；铝蜂窝夹芯板质量比吸能和体积比吸能与壁厚边长比、板厚芯高比均呈幂次关系。

Exploring Low-speed Dynamic Impact Response of AluminumHoneycomb Sandwich Panel

To study the influence of different structural parameters on the low-speed dynamic impact response of two aluminum honeycomb sandwich panels that have the same mass and different strength, the numerical model of the aluminum honeycomb sandwich panel subjected to the low-speed impact of a half-ball drop hammer was established. The results on its finite element calculation and test were compared to verify the reliability of the model. On this basis, the effects of different upper and lower aluminum panel thickness and honeycomb core wall thickness on the energy absorption of the aluminum honeycomb sandwich panel under low-speed impact were studied. The results show that, under the condition of the same mass, the force-displacement curve of the sandwich panel with small strength and large height is more likely to appear in the bimodal mode under low-speed impact. Increasing the honeycomb core wall thickness or the upper and lower aluminum panel thickness may increase the first peak force but reduce the second peak force. The honeycomb core of the sandwich panel with small strength but large height occupies more energy absorption ratio in low-speed impact, while the upper aluminum panel with large strength but small height absorbs more energy, and the mass and volume of the former are higher than the energy absorption ratio of the latter. The mass and volume specific energy absorption ratio of the aluminum honeycomb sandwich panel is dependent on the ratio of wall thickness to side length and the ratio of plate thickness to core thickness.