鸟撞复合材料蜂窝夹芯平板动响应分析

Dynamic response analysis on bird impacted composite honeycomb sandwich structure

对明胶鸟弹撞击复合材料蜂窝夹芯平板过程进行数值模拟研究,探究复合材料面板、蜂窝芯以及明胶鸟弹的建模方法,研究复合材料面板不同铺层方式以及蜂窝芯高度的变化对夹芯平板的抗鸟撞能力及吸能效果的影响。结果表明:数值模拟结果与实验结果有良好的一致性;冲击能量部分被鸟弹自身破坏所吸收,部分继续储存在鸟弹未完全破碎的残余部分中,其余能量则被平板以结构变形和损伤破坏的形式吸收;前面板纤维铺层方式为±45°的夹芯平板比±90°的夹芯平板吸收鸟撞冲击的能量多;随着蜂窝芯高度的增加,夹芯平板冲击后的变形量减少,平板内能变化减小,吸收冲击能量减少。

The finite element model of composite honeycomb sandwich structure subjected to gelatin bird impact was established.The effects of different layering methods of the fiber,the change of honeycomb core height on the anti-bird impact and energy absorption of sandwich plate were studied.The validity of the model was proved by the comparison with experimental results.The results show that the numerical simulation results are in good agreement with the experimental results.Part of the impact energy was converted into the internal energy of bird,part of the impact energy was continued to be stored in the remains of the gelatin bird which is not completely broken,the rest of the energy is converted into the internal energy of the structure.It is also found that the sandwich plate with ±45°fiber layer absorbed the energy more than the sandwich plate with ±90°fiber layer in the front panel.With the increase of the height of honeycomb core,the deformation of sandwich plate decreases,the variation of plate internal energy decreases,and the absorption of impact energy decreases.