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利用显式动力有限元方法数值研究了具有密度梯度六边形蜂窝材料的面内冲击动力学性能。根据功能梯度材料的概念,首先建立了具有密度梯度的蜂窝材料模型。基于此模型,具体讨论了密度梯度和冲击速度对六边形蜂窝材料变形模式和能量吸收性能的影响。研究结果表明,通过恰当地选择蜂窝材料的密度梯度,初始应力峰值明显减小,材料的能量吸收能力能够有效地得到控制。此结论为实现多胞材料动力学性能的多目标优化设计提供了新的设计思路。
The in-plane impact dynamics of hexagonal honeycomb with density gradient was studied numerically by explicit dynamic finite element method. According to the concept of functionally graded material, a honeycomb material model with density gradient is established first. Based on this model, the effects of density gradient and impact velocity on the deformation mode and energy absorption of hexagonal honeycomb materials are discussed in detail. The results show that by properly choosing the density gradient of the honeycomb material, the peak value of the initial stress is significantly reduced, and the energy absorption capacity of the material can be effectively controlled. This conclusion provides a new design idea for multi-objective optimization design of multi-cell material kinetic performance.