纸浆模塑品缓冲性能影响因素的仿真研究

Simulation Study on Influence Factors of Buffering Properties of Molded Pulp Products

目的研究形状、结构参数对纸浆模塑品承载和缓冲性能的影响,为纸浆模塑品缓冲结构设计提供更多参考。方法通过拉伸试验得到材料物理性能参数。对不同形状单元进行静态压缩试验和有限元模拟,对比验证仿真的可靠性。利用Ansys Workbench/LS-DYNA对3种不同形状单元以及3个结构因素的四棱台进行动态冲击模拟,评价其承载性能,并从能量吸收方面评价缓冲性能。结果不同形状单元中,圆台的承载和缓冲性能最佳;随着斜度增大,极限载荷和吸能性能整体呈下降趋势,1°时四棱台单元极限载荷最大,4°次之,1°~4°时吸能性能较好且变化相对稳定;随着长宽比增大,极限载荷和能量吸收整体均呈现下降趋势;极限载荷随着高度增加而减少,高度在10~25 mm时能量吸收不断减少,在25~40 mm时不断增加,在30~40 mm时单位体积吸能较稳定。结论在设计缓冲结构时,尽可能选择圆台状单元,斜度在1°时最佳,4°次之,长宽比在1~1.5最佳,高度在30~40 mm较好。

The work aims to study the influence of shape and structure parameters on the bearing and cushioning properties of pulp molded products,and to provide more reference for the cushioning structure design of pulp molded products.The physical properties of the material were obtained by a tensile test.The static compression test and finite element simulation of different shape units were carried out to verify the reliability of the simulation.Ansys Workbench/LS-DYNA was used to simulate the dynamic impact of square frustum units with three different shapes and three structural factors to evaluate their load-bearing performance and buffer performance in terms of energy absorption.The results showed that the bearing and buffering performance of the circular truncated cone was the best among the units with different shapes;With the increase of the slope,the ultimate load and energy absorption performance showed a downward trend.The ultimate load of the square frustum unit was the largest at 1°,followed by 4°,and the energy absorption performance was better and the change was relatively stable at 1°~4°;With the increasing aspect ratio,the ultimate load and energy absorption overall showed a downward trend;The ultimate load decreased with the increase of height,the energy absorption decreased at the height of 10~25 mm and increased at the height of 25~40 mm,the energy absorption per unit volume was relatively stable at 30~40 mm.Therefore,when designing the buffer structure,the circular truncated cone unit should be selected as far as possible,the best slope is 1°,followed by 4°,the best aspect ratio is 1~1.5,and the best height is 30~40 mm.