关键词: 蜂窝材料, 拉胀蜂窝, 动态压溃, 旋转三角形模型, 负泊松比, 有限元

Abstract: On the basis of rotating triangle model, the different honeycomb models for different rotating angles are presented to improve the dynamic mechanical properties of honeycomb material. Numerical simulations by software ANSYS/LS-DYNA were conducted to explore the in-plane dynamic crushing behavior of the rotating triangle honeycombs at different impact velocities. The effects of rotating angles and impact velocities on deformation modes and the plateau stress are investigated, and the energy absorption characteristics of rotating triangle honeycombs are discussed. The results show that the deformation process of rotating triangle honeycombs is divided into two phases, and the nominal stress-strain curve has two plateau regions. The rotating triangle honeycombs have certain dynamic auxetic characteristics. When the rotating angle or the impact velocity reaches to a critical value, the nominal stress-strain curve has only one plateau region. At different impact velocities, the rotating triangle honeycombs have better energy absorption capacity compared to the hexagonal honeycombs. Key

Key words: honeycombmaterial, auxetichoneycomb, dynamiccrushing, rotatingtrianglemodel, negativePoisson'sratio, finiteelement