梯度变化对密度梯度蜂窝材料力学性能的影响

Influences of density gradient variation on mechanical performances of density-graded honeycomb materials

为确定一定质量蜂窝材料的密度梯度大小对材料能量吸收性能的影响,基于二维圆环系,通过改变圆环的壁厚,建立了具有不同密度梯度的二维密度梯度圆环蜂窝材料模型。在此基础上讨论了不同冲击速度下,密度梯度大小对蜂窝材料能量吸收特性的影响。研究结果表明,对于相对密度从冲击端到固定端递减的情况,在高速冲击条件下,梯度系数越大,材料单位质量的能量吸收率越高。研究结果可为完善密度梯度蜂窝材料动力学性能的设计提供参考。

Based on the two-dimensional ring system, a computational model was developed for densi ty-graded circular honeycomb materials by changing the wall thicknesses of the rings. And further discussion was carried out for the influences of the density gradient variation on the energy-absorption performances of the density-graded honeycomb materials impacted by the rigid plate at different veloc- ities. The results show that for the honeycomb material with the relative density decreasing from the impact end to the fixed end, under a high-velocity impact, the higher the density gradient, the more the energy absorbed per unit mass.