明胶鸟弹撞击复合材料蜂窝夹芯板试验

开展明胶鸟弹撞击复合材料蜂窝夹芯板试验，研究夹芯结构在软体高速冲击下的损伤形式，分析相关因素对结构动态响应结果的影响。通过CT扫描对复合材料蜂窝夹芯板内部进行检测可知，面板出现分层、基体开裂、纤维断裂、凹陷、向胞内屈曲等损伤形式，蜂窝芯出现芯材压溃、与面板脱粘的损伤形式；分析复合材料蜂窝夹芯板后面板的动态变形过程及撞击中心处位移-时间数据可知，复合材料蜂窝夹芯板在撞击过程中出现由全局弯曲变形主导和局部变形主导的两种变形模式；通过对比不同工况下的复合材料蜂窝夹芯板损伤程度可知，复合材料蜂窝夹芯板损伤程度随鸟弹撞击速度的增加而增大；蜂窝芯高度为10 mm的复合材料蜂窝夹芯板较蜂窝芯高度为5 mm的复合材料蜂窝夹芯板的损伤程度大；初始动能较大的球形鸟弹较圆柱形鸟弹对复合材料蜂窝夹芯板造成的冲击损伤程度更大。 

Experiment of composite honeycomb sandwich panels subjected to gelatin bird impact

In order to study the damage mechanics and the effects of some factors on the dynamic response of the composite honeycomb sandwich panels under the bird impact, the impact of gelatin bird on the composite honeycomb sandwich panels experiment was conducted. CT scanning technology was used to detect the inside of the composite honeycomb sandwich panel. Delamination, matrix cracking, fiber fracture, dent and buckling occur in panels;crushing and debonding with panel occur in the honeycomb core;The dynamic deformation and displacement-time data of rear panel of composite honeycomb sandwich panels were analyzed. The global bending deformation and local deformation appear in the sandwich panels during the impact;The comparative analysis was carried out, the damage level of the composite honeycomb sandwich panels increases with the increase of the impact speed;the composite honeycomb sandwich panel with a thickness of 10 mm is more severe than the composite honeycomb sandwich panel with a thickness of 5 mm in the damage level;the spherical bird with higher initial kinetic energy causes more damage to the composite honeycomb sandwich panel than the cylindrical bird.