蜂窝纸板缓冲曲线特征分析

分析了典型缓冲材料与蜂窝纸板力学模型的应力-应变曲线及缓冲系数-最大应力曲线特征,并提出了利用缓冲系数-最大应力曲线设计蜂窝纸板缓冲衬垫的方法。研究结果表明:典型缓冲材料的应力-应变曲线呈现单调递增趋势;蜂窝纸板的应力-应变曲线特征比较复杂,分为线弹性阶段、屈曲变形阶段、密实化阶段;蜂窝纸板的缓冲系数-最大应力曲线不规则,线弹性阶段的缓冲系数较大,缓冲效率不高,在该阶段可以与其它缓冲材料组合使用,屈曲变形阶段的缓冲系数及应力均较小,缓冲效率较高,但需要跨越峰值应力,在该阶段衬垫设计按照线弹性阶段的峰值应力计算,密实化阶段的材料承受应力较大,不利于保护产品。预压后的蜂窝纸板损失了部分承载能力,其缓冲系数-最大应力曲线平滑,因而其衬垫可按照经典缓冲衬垫设计方法进行设计。

Analysis of Buffer Curve of Honeycomb Paperboard

The characteristics of the stress-strain curve and cushion coefficient-maximum stress curve of typical cushioning materials and honeycomb paperboard were analyzed. The cushion pad design method of honeycomb paperboard based on cushion coefficient-maximum stress was put forward. The research showed that the stress-strain curve of the typical cushioning material was monotonic increasing variation. The stress-strain curve of the honeycomb paperboard was complicated, which could be classified into linear bearing stage, buckling stage and densification stage. The cushion coefficient-maximum stress curve of the honeycomb paperboard was irregular. The cushion coefficient was large in linear bearing stage and the buffering efficiency was small. In this stage, it was suggested that the honeycomb paperboard be used with other cushioning materials. The characteristic of the buckling stage was that the cushion coefficient and stress were small and the buffering efficiency was high, and the cushion curve must surpass the peak stress of the linear bearing stage. In this stage, the maximum stress should be calculated according to the peak stress of the linear bearing stage. In the densification stage, the material bore greater stress, which was not conducive to the protection of the products. Prepressure honeycomb paperboard lost part of the load capacity in the linear bearing stage. The cushion coefficient-maximum stress curve was smooth. The cushioning liner design could be carried out according to the classical pad design method.