Influence of Honeycomb Thickness on Dynamic Cushioning Energy Absorption of Paper Honeycomb/Polyethylene Foam Composite⁃layered Structure

doi:10.19491/j.issn.1001-9278.2020.08.006

Abstract

Abstract:

Aimed at the cushioning and protective functions of composite-layered structures of paper honeycomb and polyethylene closed-cell foam, the influence of honeycomb thickness on their acceleration response, compression deformation and cushioning energy absorption under different drop impact conditions were studied. One layer of honeycomb corresponded to a stress wave peak in the static compressions, and a small stress wave peak of sub-collapse behavior occurred in the larger thickness honeycomb in the dynamic compression of drop impacts. The impact resistance of polyethylene foam and its composite-layered structures were improved with the increase of honeycomb thickness. For the composite-layered structures of paper honeycomb and polyethylene foam with the honeycomb thicknesses of 10, 15, 20 and 25 mm, the increase of honeycomb thickness reduced the cushioning energy absorption at low impact energy but enhanced the energy absorption capability at high impact energy. However, the cushioning energy absorption of composite-layered structures with a large honeycomb thickness of 70mm was relatively poor. For the structures with the same honeycomb thickness, the strain energy, specific energy absorption and stroke efficiency of single-sided composite-layered structures were improved by 11.5 %, 39.1 % and 16.2 %, respectively, compared to the double?sided composite layered structures under the same impact mass or drop impact energy, indicating better cushioning energy absorption.

Key words: paper honeycomb, polyethylene foam, composite layered structure, drop impact, cushioning energy absorption

CLC Number:

TQ325.1⁺2

Jianfen KANG, Yanfeng GUO, Yungang FU, Qing WEI, Meijuan JI. Influence of Honeycomb Thickness on Dynamic Cushioning Energy Absorption of Paper Honeycomb/Polyethylene Foam Composite⁃layered Structure[J]. China Plastics, 2020, 34(8): 36-43.

Figures/Tables 8

试样编号	结构形式	结构类型
(1) 静态：H/55	蜂窝/泡沫
(2) 跌落冲击：H/55?DH?W	蜂窝/泡沫
(1) 静态：H/55/H	蜂窝/泡沫/蜂窝
(2) 跌落冲击：H/55/H?DH?W	蜂窝/泡沫/蜂窝

Tab.1. Structures and specimen numbering

Fig.1. Acceleration response curves of drop impacts

Fig.2. Static compression curve and deformation characteristics

Fig.3. Dynamic compression characteristics of double?sided composite layered structures

Fig.4. Dynamic compression deformation characteristics of single?sided composite layered structures

Fig.5. Drop impact stress?strain curves with different impact masses

Fig. 6. Influence of honeycomb thickness and impact mass on key energy?absorbing indices

Fig.7. Influence of honeycomb thickness and impact energy on key energy?absorbing indices

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