Abstract

In this paper, a porous material–bi-directional corrugated honeycomb aluminum (Bi-DCHA) was manufactured, and quasi-static compression experiments were performed in axial (Y/Z-direction) and radial (X-direction) directions. It was concluded that the mechanical properties in the Y/Z directions were better than those in X-direction. Further, to verify the effect of expanded polypropylene (EPP) on the properties of Bi-DCHA, three different density EPP were used to fill them, and the property of Y/Z-direction was performed. As a result, compared with Bi-DCHA unfilled with EPP, the performance of Bi-DCHA filled with EPP improved, and is better than the sum of EPP and Bi-DCHA unfilled with EPP. Observing the stress-strain curves of the four groups of samples, we can find that the initial peak stress (σ_P) of the Bi-DCHA filled with EPP is lower than Bi-DCHA; the stress in the plateau zone (σ_pl) increases with the increase of the EPP density. Observing the deformation process of the specimen, it was found that after filling the EPP, the deformation process of the specimen changed from global buckling/tilt mode to local compact plastic deformation mode. The energy absorption effect of Bi-DCHA filled with EPP is stronger than that of unfilled specimen.

摘要

在本文中，制造了一种多孔材料-双向波纹蜂窝铝（Bi-DCHA），并在轴向（Y/Z 方向）和径向（X 方向）方向上进行了准静态压缩实验。得出的结论是，Y/Z 方向的力学性能优于 X 方向的力学性能。此外，为了验证发泡聚丙烯（EPP）对Bi-DCHA性能的影响，使用三种不同密度的EPP填充它们，并进行了Y/Z方向的性能测试。结果表明，与未填充EPP的Bi-DCHA相比，填充EPP的Bi-DCHA的性能有所提高，并且优于未填充EPP的EPP和Bi-DCHA之和。观察四组试样的应力-应变曲线，可以发现初始峰值应力（σ _P) 填充 EPP 的 Bi-DCHA 低于 Bi-DCHA；高原区的应力（σ _pl）随着 EPP 密度的增加而增加。观察试件的变形过程，发现填充EPP后，试件的变形过程从整体屈曲/倾斜模式转变为局部致密塑性变形模式。填充有EPP的Bi-DCHA的能量吸收效果比未填充的试样强。