两种二级铝蜂窝结构缓冲吸能特性研究

Studies on buffering and energy-absorption of two bilayer aluminum honeycomb structures

该文对二级串联式铝蜂窝结构和二级组合式铝蜂窝结构的缓冲吸能特性进行比较,从而实现对铝蜂窝缓冲吸能结构装置优化设计。通过准静态异面压缩实验,对两种不同正六边形胞元的铝蜂窝进行测试,分别得到这两种二级铝蜂窝结构的压缩变形过程和应力响应曲线,并对其变形机理进行分析。实验结果表明,二级串联式铝蜂窝和二级组合式铝蜂窝均能实现梯度平台应力响应,这有利于二级缓冲吸能结构的工程应用。此外,对于单轴压缩,二级组合式铝蜂窝的嵌入过程只有一个应力峰值并且其能达到更高的压实程度,但是峰值应力值较大,有待进一步优化。在吸能特性方面,与同一尺寸的二级串联式铝蜂窝缓冲器相比,组合式铝蜂窝缓冲结构的单位体积吸能效果稍强,尤其是单位质量吸能效果更好,可为缓冲吸能结构的优化设计提供新的选择方式。

Aimed to optimize multi-layer aluminum hexagonal honeycomb buffer and energy- absorption structures, related properties between bilayer combined aluminum hexagonal honeycomb and series aluminum honeycomb were compared. The authors carried out on two types of hexagonal honeycomb with different sizes of cells under quasi-static out-of-plane compression. As a result, stress-strain curves of combined aluminum honeycomb and series aluminum honeycomb were gotten. Results show that both bilayer aluminum honeycomb structures can realize gradient plateau stress response, which is beneficial in the practical applications. Besides, it also shows that the insertion process of combined honeycomb structure can erase the initial peak stress,but a higher peak stress is left and it can also realize higher compaction degree. In a word, the ability of buffering and energy-absorption is better than series honeycomb structures.