分层屈服强度负泊松比蜂窝材料的冲击力学研究

Impact Mechanics Study on Negative Poisson's Ratio Honeycomb Materials with Layered Yield Strength

利用非线性有限元软件ABAQUS,借助铝材料的优良特性和负泊松比效应,改变铝材料的屈服强度,构建了2种蜂窝模型,探讨不同屈服强度对内凹六边形蜂窝材料在不同冲击速度下的冲压变形方式、动态响应以及能量吸收的影响。研究结果表明,分层屈服强度负泊松比蜂窝材料受到铝基材屈服强度和冲击速度的影响;合理适当地调整铝基材的屈服强度变化值可以降低蜂窝材料的初始应力峰值,与此同时还能保持较高的能量吸收率,可为功能梯度内凹六边形蜂窝材料的研究提供思路。

Using nonlinear finite element software ABAQUS,the yield strength of aluminum material was changed because of the excellent characteristics of aluminum material and the negative Poisson's ratio effect.Two kinds of honeycomb models were constructed to investigate the stamping deformation mode,dynamic response and energy absorption of concave hexagonal honeycomb material with different yield strength at different impact velocities.The results showed that the negative Poisson's ratio honeycomb material with layered yield strength was affected by the yield strength and impact velocity of aluminum base material.Reasonable and appropriate adjustment of yield strength aluminum base material can reduce the initial stress peak value of honeycomb materials and maintained high energy absorption rate at the same time.This research can provide new ideas for the research of functional gradient concave hexagonal honeycomb materials.