金属蜂窝材料的面内冲击响应和能量吸收特性

In-plane crushing response and energy absorption characteristics of metal honeycombs

利用显式动力有限元法对三角形蜂窝材料在面内冲击载荷下的动力响应和能量吸收特性进行了研究。具体讨论了相对密度、冲击速度以及冲击方向对蜂窝材料变形模式、平台应力和比能量吸收能力的影响。结果表明,除了胞元的微结构特征参数(例如壁长、壁厚以及扩张角等),蜂窝材料的动力响应特性还依赖于冲击速度和冲击方向。在相对密度和冲击速度不变的前提下,试件沿Y方向冲击时表现为更高的平台应力和更强的能量吸收能力。随着冲击速度的增加,惯性效应明显,蜂窝材料的平台应力和能量吸收能力对冲击方向更敏感。将为多胞材料动力学多目标优化设计提供新的设计思路。

The dynamic crushing response and energy absorption characteristics of triangular honeycombs under in-plane impact loading were numerically investigated by means of explicit dynamic finite element method in this paper.The effects of relative density,impact velocity and impact direction on the deformation modes,plateau stresses and specific energy absorption abilities of honeycombs were discussed in detail.Research results showed that except for the cell micro-structural parameters（e.g.edge length,edge thickness,expanding angles,etc.）,the dynamic response characteristics of triangular honeycombs also depended on impact velocities and impact directions.Under the conditions that the relative density and impact velocity were all the same,the plateau stresses and energy absorption abilities of metal honeycombs in the Y direction were both higher than ones in the X direction.With the increase of impact velocity,the inertia effect played an important role in the dynamic crushing of metal honeycombs.And impact direction had great influence on plateau stresses and energy absorption abilities.These results will provide new guidance in the multi-objective optimization design of impact dynamic properties of cellular materials.