纸夹芯和泡沫复合层状结构的动态缓冲吸能特性研究

针对由EPE(Polyethylene foam,聚乙烯泡沫)、瓦楞纸板、蜂窝纸板组成的复合层状结构在跌落冲击载荷作用下的缓冲防护特性,研究了加速度-冲击持续时间曲线、应力-应变曲线的特征,探讨了冲击能量对峰值应力、缓冲吸能特性的影响关系。结果表明,纸瓦楞、纸蜂窝改善了EPE的缓冲吸能特性,纸夹芯和泡沫复合层状结构的峰值应力、单位面积吸能、单位体积吸能、比吸能都随着跌落冲击能量的增加呈线性增加的趋势。在相同跌落冲击条件下,相比瓦楞与EPE复合结构,蜂窝与EPE复合结构的峰值应力平均减少了23.6%,能量吸收率平均提高了8.85%,比吸能平均提高了18.1%,缓冲吸能效果更好。

On the characteristics of dynamic buffer energy absorption of composite layered structures made of paper sandwich core and polyethylene foam

In view of the buffer and protective characteristics of composite layered structure composed of polyethylene foam, corrugated paperboard and honeycomb paperboard under drop impact, the characteristics of acceleration-impact duration curve and stress-strain curve were studied, the influence of impact energy on peak stress and energy absorption characteristics were investigated. Results show that both corrugated paperboard and honeycomb paperboard have improved the buffer energy absorption characteristics of polyethylene foam. The energy absorption parameters including peak stress, energy absorption per unit area, energy absorption per unit volume and specific energy absorption of composite layered structures made of paper sandwich core and plastic foam increase linearly with the increase of drop impact energy. Compared with corrugated paperboard and polyethylene foam composite structure, the peak stress of honeycomb paperboard and polyethylene foam composite structure reduces by 23. 6 under the same drop impact condition: the energy absorption rate increases by 8. 85 %: the energy absorption ratio increases by 18. 1%, indicating its buffer energy absorption effect is better.