Weaire-Phelan缓冲结构跌落冲击有限元分析

Drop impact analysis of Weaire-Phelan cushioning structure by using finite element method

缓冲包装的结构对其缓冲性能具有重要影响。本文设计了两种胞元密度的Weaire-Phelan缓冲结构,其试样体积基本相同、用料体积一致。应用有限元方法对这两种试样受冲击后的压缩变形过程进行了分析,研究了在不同跌落高度、跌落质量下Weaire-Phelan缓冲结构的冲击承载能力和能量吸收特性。结果表明,Weaire-Phelan缓冲结构受冲击后的压缩变形过程与常见的多胞结构类似。首先顶部胞体发生叠缩,然后叠缩逐渐向下传递,最后是一个由下及上和由上及下双向同时渐进叠缩的压溃过程,与蜂窝结构从顶部到底部逐渐依次折叠的压溃方式有所不同。Weaire-Phelan缓冲结构受跌落冲击时的峰值应力、平台应力随跌落高度的增加而增大,而跌落质量对峰值应力、平台应力几乎没有影响;当胞元密度增大,Weaire-Phelan缓冲结构受跌落冲击时的平台应力略有提高,但吸能性能略有降低。本研究可为Weaire-Phelan结构的缓冲包装优化设计提供参考依据。

The structure of cushioning packaging has an important effect on its cushioning performance. In this paper, Weaver-Phelan structures with two cell densities are designed, and the sample volume is basically the sameand the material volume is consistent. In the case of various drop heights and weights, the impact bearing and energy absorption properties of Weaire-Phelan structures are investigated by finite element method. Results obtained show that the drop process of Weaire-Phelan structure is similar to that of the common porous structure. At first, the collapse appears at the top of the structure, and then passes down gradually. Finally, it is a crushing process that progressively collapses from bottom to top. The peak stress and platform stress of the Weaire-Phelan structure increase with the drop heights, while the drop weights have little effect on the peak stress and platform stress. When the cell densities increase, the platform stress of Weaire-Phelan structure increases slightly, but the energy absorption performance decreases slightly. This paper provides a reference for the cushioning structure design of Weaire-Phelan structure.