负泊松比蜂窝材料抗爆炸特性及优化设计研究

为了深入研究车辆底部防护组件爆炸冲击下的结构响应，提高防护型车辆的抗爆炸冲击性能，建立了某车辆底部防护组件在爆炸冲击下的有限元模型，并进行爆炸冲击台架试验验证了有限元模拟的可靠性；将内凹六边形负泊松比蜂窝材料作为防护组件的夹芯部分，分析负泊松比蜂窝材料在爆炸冲击下的变形模式，并对比了同等质量的其他3种防护组件的抗爆炸冲击性能。结果表明，含有负泊松比蜂窝夹芯的防护组件具有更优的抗爆性能。建立了以内凹六边形负泊松比蜂窝胞元尺寸参数为设计变量的多目标优化问题的数学模型，采用多目标遗传算法获得胞元几何参数的最优方案，有效降低了防护组件基板的最大挠度和最大动能。

Research on explosion-proof characteristics and optimization design of negative Poisson’s ratio honeycomb material

In order to study in depth the structural response of the bottom protective component of the vehicles under blast loading and improve the blast resistant performance of the protective vehicles, a finite element model of the bottom protective component of a vehicle under blast loading was established, and the reliability of the finite element simulation was verified by the explosion impact bench test; the concave hexagonal negative Poisson’s ratio honeycomb material was used as the core layer of the protective component, the deformation mode of the negative Poisson’s ratio honeycomb material under blast loading was analyzed, and the blast resistant performance was compared with the other three protective components of the same mass. The results show that the protective component containing negative Poisson’s ratio honeycomb core has better resistance to blast loading. A mathematical model was established for multi-objective optimization problems with the cell size parameters of the honeycomb material as design variables, and the multi-objective genetic algorithm was used to obtain the optimal solution of the cell geometric parameters, which effectively reduces the maximum deflection and maximum kinetic energy of the protective component substrate.