中文摘要：

利用显式动力有限元ANSYS/LS-DYNA数值研究了三角形和四边形蜂窝材料中集中缺陷对其面内冲击性能的影响。研究结果表明,对于集中缺陷,除了缺陷率,缺陷集中区域的位置也是材料设计中需要考虑的重要指标。随着缺陷率的增加,蜂窝材料的平台应力和能量吸收能力迅速降低,但随着冲击速度的增加,缺陷的影响逐渐减弱。缺陷集中区域的位置对材料的动力学响应有较大影响,而三角形蜂窝表现出更强的敏感性。此结论将为多孔材料的动力学优化设计提供了理论指导。

英文摘要：

The effects of concentrated defects on the in-plane dynamic crushing of triangular and quadratic honeycombs are numerically investigated by means of the explicit dynamic finite element simulation using ANSYS/LS-DYNA.Research results show that for concentrated defects,the concentration position of the defects,as well as the defect ratio,is an important factor that should be considered in the material design.Along with the increase of the defect ratio,the plateau stress and the absorbed energy are all decreased,the increase of the impact velocity weakens the effects of defects.The defect concentration position has great influence on the dynamic response of honeycombs,and triangular honeycomb displays greater sensitivity.These results will provide helpful guidance for the dynamic optimum design of the honeycombs.