组合式铝蜂窝低速冲击响应特性实验研究

以组合式铝蜂窝为研究对象，通过改进SHPB系统，利用激光光通量位移计和PVDF压电薄膜测试技术，得到了铝蜂窝结构大应变低速压缩应力应变曲线；结合高速摄影分析了组合式铝蜂窝结构在低速撞击条件下的变形响应方式和吸能特性过程.结果表明，组合式蜂窝结构动态吸能可分为蜂窝嵌入过程和结构共同压溃两个阶段，对于厚度相同的两级组合式铝蜂窝结构这两个阶段的转换变形应变约为0.5，嵌入阶段所吸收的能量占总吸能比约为25%；组合蜂窝结构的吸能效率曲线存在两个相当的峰值，约为40%.与准静态结果对比，动态加载条件下，组合式蜂窝结构吸能效果更好. 

Experimental Study on Low-Speed Dynamic Response of Combined Aluminum Honeycomb

By impacting experiments with low speed in an improved SHPB system,force was measured with a PVDF sensor and displacement was obtained by a laser system in an in-situ measurement way.As a result,curves between stress and strain were obtained.The properties of buffer and energy-absorbing of combined aluminum honeycomb was discussed using high-speed photography.The results show that the whole process can be divided into two stages:the inserting process between up-down honeycombs and the conjunctly crushing process;the joint happens in the strain of about 0.5.Besides,there are two peaks of about 40% in the effective energy absorption curves and the energy-absorbing property is better in the condition of dynamics.