The Effect Of Strain Rate On The Cushioning Properties Of The Molded Pulp Products

The molded pulp products have the advantages of low power consumption and lowmanufacturing cost in the production process, which make it have increasingly wide applications.In the circulation process, the molded pulp products absorb the energy to achieve the buffereffect of the external environment mainly by the deformation of the structure. Researches onmolded pulp packaging products at different initial strain rate under the conditions of static anddynamic cushioning performance help to improve the logistics and transport level and strengthenthe improvement of the structure of cushion packaging.In this paper, through the method of combining test and finite element analysis, we studiedthe change of the compression load carrying capacity and the energy absorbing characteristics atdifferent initial strain rate(6.4×10^-4s^-1，3.8×10^-3s^-1，1.9×10^-2s^-1，4.2×10¹s^-1，6.0×10¹s^-1å'Œ7.5×10¹s^-1).First, this article tested the physical properties such as density, thickness and elasticmodulus of molded pulp material. The analysis provided the results that the thickness of themolded pulp products were not uniform, even the same molded pulp product also had a certaindegree of dispersion. Static compression tests of the pulp molding products had carried out usinguniversal testing machine. Drop hammer impact test system and high-speed camera had used torecord the dynamic impact deformation process. The analysis of the data showed that as theinitial strain rate became large, the yield stress of the molded pulp products and platforms stressincreased and their carrying capacity was growing.Energy absorption curve was constructed through the drawing analysis software of origin.The analysis showed that as the initial strain rate became large, molded pulp products unitvolume energy absorption was increased and the best energy-absorbing shoulder point moved tothe top right.The modeling analysis was carried out by ABAQUS/CAE analysis software. The analysisshowed that the trend of simulation and experimental results were substantially same, but therewere some deviations in the data.This paper is funded by the national natural science foundation （50775100）.