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摘要: 建立了四边手性蜂窝的有限元模型，采用数值模拟方法研究了四边手性蜂窝在不同冲击速度下的变形模式和能量吸收等动力学响应特性，并同普通六边形蜂窝的冲击行为进行了对比。计算得到了这2种蜂窝的变形模式图、动力响应曲线和能量吸收曲线。模拟结果表明：低速冲击下，四边形手性蜂窝的变形模式为“Z”字形；高速冲击下，四边手性蜂窝的变形模式与普通蜂窝的“I”字形模式类似；在适中速度的冲击下，四边手性蜂窝表现出兼具高速冲击和低速冲击特征的一种过渡态变形模式；随着冲击速度的提高，局部变形带由固定端向冲击端移动，并且能量吸收能力也随之提高；在中、低速度的冲击下，能够观察到拉胀材料压缩时特有的“缩颈”现象。Abstract: A finite element model was developed for tetrachiral honeycombs.By using the developed model, numerical simulations were conducted to explore the deformation modes and energy absorption properties of the tetrachiral honeycombs subjected to different impact velocities.And the corresponding numerical simulations were carried out on hexagonal honeycombs by applying the existent model.The deformation mode diagrams and the dynamic response curves for two kinds of honeycombs were obtained.At low impact velocities, the deformation of tetrachiral honeycombs is of"Z"mode.At high impact velocities, "I"deformation mode is observed in tetrachiral honeycombs when crushing, which is similar to traditional honeycombs.And a transitional deformation mode is present in tetrachiral honeycombs subjected to moderate impact velocities.As the impact velocity increases, the localized bands transit from the fixed end to the impact end and the tetrachiral honeycombs display higher energy absorption capacities.When the velocity is low or moderate, the auxetic honeycombs display the unique shrinkage under dynamic compression.
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Key words:
- solid mechanics /
- dynamic crushing /
- ANSYS/LS-DYNA /
- tetrachiral honeycomb /
- deformation mechanism /
- energy absorption /
- auxetic
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图 3 冲击速度为7.0m/s时六边形蜂窝的变形模式
Figure 3. Deformation modes of hexagonal honeycombs under the impact velocity of 7.0m/s
图 4 冲击速度为70.0m/s时六边形蜂窝的变形模式
Figure 4. Deformation modes of hexagonal honeycombs under the impact velocity of 70.0m/s
图 5 冲击速度为3.5m/s是四边手性蜂窝的变形模式
Figure 5. Deformation modes of tetrachiral honeycombs under the impact velocity of 3.5m/s
图 6 冲击速度为56.0m/s是四边手性蜂窝的变形模式
Figure 6. Deformation modes of tetrachiral honeycombs under the impact velocity of 56.0m/s
图 7 冲击速度为140.0m/s是四边手性蜂窝的变形模式
Figure 7. Deformation modes of tetrachiral honeycombs under the impact velocity of 140.0m/s
图 8 不同速度冲击下四边手性蜂窝结构的压缩反力和压缩位移的变化曲线
Figure 8. Dynamic force-displacement curves of tetrachiral honeycombs under different impact velocities
图 9 不同速度冲击下四边手性蜂窝结构的能量吸收曲线
Figure 9. Energy absorption for tetrachiral honeycombs under different impact velocities
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