具有负泊松比效应蜂窝材料的面内冲击动力学性能

摘要

Based on explicit dynamic finite element simulation by ANSYS/LS-DYNA, the in-plane dynamic crushing of honeycombs with negative Poisson's ratio effects was numerically investigated. Under the assumption that the edge length and thickness were the same, the hexagonal honeycomb models filled with concave cells by the variation of expanding angles were established. The effects of expanding angle and impact velocity on the in-plane crushing deformation and energy absorption capacities of honeycombs were discussed in detail. Results show that the in-plane dynamic crushing of re-entrant honeycombs relies on the expanding angle. The larger is the absolute value of the expanding angle, the higher is plateau stress at the proximal end. The specimens display higher energy absorption capacities with the increase of the impact velocity.%基于显式动力有限元ANSYS/LS-DYNA,研究了面内冲击作用下具有负泊松比效应蜂窝材料的动态冲击性能.在保证胞元壁长和壁厚不变的前提下,通过改变胞元扩张角,建立了内凹六边形蜂窝模型.具体讨论了胞元扩张角和冲击速度对蜂窝材料面内冲击变形和能量吸收能力的影响.研究发现,在冲击载荷作用下,内凹蜂窝材料的面内冲击性能依赖于胞元扩张角.胞元扩张角的绝对值越大,冲击端的平台应力越高.随着冲击速度的提高,蜂窝材料表现出更强的能量吸收能力.