Dynamic responses of aramid honeycomb sandwich panels loaded by an electric gun
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摘要: 研究了方形钛-芳纶蜂窝夹芯板在电炮驱动的高速聚酯飞片撞击加载下的动力响应，给出了面板和蜂窝芯层在不同冲击速度下的变形及失效模式。采用VISAR(velocity interferometer system for any reflector)测速技术测量了后面板中心点的速度时程，分析了芳纶蜂窝夹芯板的动态响应过程，讨论了冲击速度对夹芯板动力响应和抗冲击能力的影响。研究结果表明，低波阻抗的芳纶蜂窝破碎行为阻断了应力波向后面板的传播途径，破碎的蜂窝和塑形大变形的前面板吸收了高速冲击的大部分能量，充分发挥了钛合金的高强度和芳纶蜂窝的缓冲吸能特性，提高了夹芯板整体的防护能力。Abstract: We studied the dynamically loaded quadrate sandwich plates constructed from titanium alloy plates with an aramid honeycomb core using high-velocity Mylar flyers produced by an electric gun, and classified systematically the deformation/failure modes of the plates and the honey comb core. Applying the velocity interferometer system for any reflector (VISAR) in measuring the velocity history at the midpoint of the back plates, we analyzed the dynamic response processes of the sandwich panels and identified the influences of the impact velocity on the dynamic response and the impact resistance of the sandwich panels. The results indicate that the stress pulses were blocked by the aramid honeycombs (a low wave impedance material), which led to the deformed front plates that absorbed most of the impact energy, thereby improving effectively the impact resistance capability of the general sandwich panels owing to the high strength of the titanium alloy and the energy absorption of the aramid honeycomb.
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Key words:
- dynamic response /
- impulse loading /
- sandwich plate /
- aramid honeycomb /
- Mylar flyer /
- electric gun
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图 1 试件和蜂窝胞元的几何尺寸
Figure 1. Geometries and dimensions of the square specimen and honeycomb cell
图 2 电炮放电回路原理图
Figure 2. A principle diagram for the discharge circuit of the electric gun
图 5 试件A1层裂模式局部放大图
Figure 5. Enlarged spallation views for the front plate of Specimen A1
图 9 蜂窝夹芯板的变形示意图
Figure 9. Sketches showing dynamic deformation of the sandwich panel with a honeycomb core
图 10 VISAR测试得到的后面板背面测试点的速度历史曲线
Figure 10. Velocity-time curves measured by VISAR at the rear surfaces of the back plates
图 11 在不同冲击速度下，试件的初始速度峰值和稳定变形速度
Figure 11. Initial peak velocities and steady velocities at different impact velocities for specimens
表 1 实验得到的冲量和失效模式
Table 1. Impulses and deformation/failure modes obtained in experiments
样品 vf/(km·s-1) I/(N·s) 前面板的失效模式 A1 1.78 0.881 层裂模式Ⅰ A2 2.00 0.990 层裂模式Ⅱ A3 2.33 1.153 层裂模式Ⅱ A4 2.74 1.356 层裂冲塞模式 
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