通过原纸拉伸试验获取蜂窝纸板的材料参数,建立蜂窝纸板的有限元简化模型(Y单元模型),采用有限元方法对该模型进行准静态加速压缩模拟,并与蜂窝纸板的面外准静态压缩试验结果进行对比;采用该模拟方法研究蜂窝孔边长、纸板厚度和胞壁厚度对Y单元折叠模式的影响。结果表明:Y单元模型经准静态加速压缩模拟得到的形貌与试验结果相吻合,压缩应力-应变曲线中平台应力的模拟结果与试验结果的相对误差为3.87%,验证了该模型的可靠性;不同规格的Y单元模型在压缩后共出现3种折叠模式,蜂窝孔边长和纸板厚度是影响Y单元折叠模式的2个关键因素。1/2蜂窝孔边长与一次折叠褶皱波长的比值会影响Y单元的一次折叠模式,而双层胞壁与单层胞壁的厚度差是导致多折叠模式发生的主要原因。

The material parameters of honeycomb paperboard were obtained by tensile test of base paper, and a simplified finite element model (Y-element model) of paper honeycomb was established. The model was subjected to quasi-static accelerated compression simulation by the finite element method, and the simulation was compared with the out-of-plane quasi-static compression test results of honeycomb paperboard. The effect of honeycomb cell wall width, paperboard thickness and cell wall thickness on the folding mode of Y element was studied by the simulation method. The results show that the morphology of the Y-element model obtained by quasi-static acceleration compression simulation was consistent with the test results; the relative error between the simulated and tested plateau stress in the compressive stress-strain curve was 3.87%, which verified the reliability of the model. The Y-element model with different specifications showed three folding modes after compression. The honeycomb cell wall width and paperboard thickness were the two key factors affecting the folding mode of Y element. The ratio of half of honeycomb cell wall width to the wavelength of a single fold affected the one-folding mode of Y element, and the thickness difference between the double-layer cell wall and the single-layer cell wall was the main reason for the occurrence of multiple folding modes.