Dynamic Crushing Response of Self-Similar Second Order Hierarchical Square Honeycombs
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摘要: 运用ABAQUS对在冲击载荷作用下二阶自相似四边形蜂窝面外方向的动态压缩行为进行了数值模拟，分析了其在冲击载荷作用下的动态压缩过程，并对孔径尺寸、冲击速度和基体材料屈服强度对其压缩模式及应力-应变关系的影响进行了研究。数值模拟表明：孔径较小的二阶自相似四边形层级蜂窝在冲击载荷作用下更易出现整体坍塌的压缩失效模式；随着基体材料屈服强度增大，平台应力值随之增加，但对平台长度没有影响；随着冲击速度的增加，冲击端平台应力值和平台长度都有所增加。Abstract: Out-of-plane dynamic crushing response of self-similar second order hierarchical square honeycombs under impact loading was simulated using ABAQUS in the present study to investigate the influence of the aperture size, the yield stress of parent material and the impact velocity on the crushing model and dynamic stress-strain relationship.The results show that the self-similar second order hierarchical square honeycombs with a smaller aperture size are more likely to undergo overall collapse under impact loading.With the increase of the yield strength of the parent material, the plateau stress increases but the length of the plateau stage is hardly changed at all.Besides, both the plateau stress and the plateau stage length at the impact end increase with the increase of the impact velocity.
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Key words:
- hierarchical cellular material /
- dynamic crushing /
- numerical simulation
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图 1 二阶层级自相似四边形铝蜂窝有限元模型
Figure 1. Finite element model of the self-similar second order hierarchical square honeycombs
图 2 两种蜂窝在v=100 m/s冲击荷载下的变形屈曲模式
Figure 2. Buckling models of two types of honeycombs under out-plane impact with v=100 m/s
图 3 两种孔径层级蜂窝材料动态应力-应变关系
Figure 3. Dynamic stress-strain curves of honeycombswith different aperture sizes
图 4 不同基材强度下蜂窝的动态应力-应变关系
Figure 4. Dynamic stress-strain curves of honeycombwith different yield stresses of parent material
图 5 不同基材强度下蜂窝的密实化应变及平台应力
Figure 5. Densification strain and plateau stress of honeycombwith different yield stresses of parent material
图 6 不同冲击速度下蜂窝的动态应力-应变关系
Figure 6. Dynamic stress-strain curves of honeycomb at different impact velocities
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