六角形纸蜂窝夹层板能量吸收研究进展

Energy Absorption Figure of Hexagonal Paper Honeycomb Sandwich Structures

分析了纸蜂窝夹层板动静态压缩试验方法及不同结构参数的纸蜂窝夹层板动静态缓冲吸能特性。试验结果表明,平台应力是蜂窝胞壁厚跨比的幂指数函数。引入压缩密实化应变概念,构建了纸蜂窝材料压缩密实化应变评估方程。将纸蜂窝夹层板压缩应力应变曲线简化为线弹性区、平台区和密实化区,构建了纸蜂窝夹层板能量吸收曲线理论模型。基于纸蜂窝夹层板动静态压缩试验,可构建纸蜂窝夹层板二维能量吸收图,以便更好地表征纸蜂窝夹层板的缓冲性能,并指出了该研究有待进一步完善之处。

The dynamic and static compression experiment methods and the cushioning properties of paper honeycomb sandwich structures with different structure factors were analyzed. Experiments express the plateau stress is the power exponent function of the thickness to length ratio of honeycomb cell-wall. The evaluation equation of compressive densification strain of paper honeycombs is modeled by introducing the instantaneous and relative density of paper honeycombs. The compressive stress strain curve is simplified into three sections： linear elasticity, plateau and densification. Considering the factors associated with the structure of paper honeycombs, the energy absorption model is obtained and characterized by the thickness-to-length ratio of the honeycomb cell wall. The 2D energy absorption figure of paper honeycomb sandwich structure is also constructed. The future research direction is indicated.