CFRP面板-功能梯度蜂窝夹层板的抗低速冲击性能

Low-velocity impact of functional gradient honeycomb sandwich plate with CFRP face sheets

针对蜂窝结构抗冲击性能进行有限元仿真,验证模型与实验结果的一致性,主要研究了碳纤维增强树脂基复合材料(CFRP)面板-功能梯度蜂窝夹层板在低速冲击下的防护特性。通过改变壁厚在传统蜂窝结构中引入密度梯度,针对不同冲击能量和不同梯度系数α,对比研究了功能梯度夹层板和传统夹层板的吸能特性。结果表明,冲击能量较小时α>1的蜂窝夹层板具有更好的吸能特性,随着冲击能量的增大,具有吸能优越性的芯层从α>1逐渐向α<1转变,当冲击能量足够击穿整个夹层板时,α<1的夹层板具有更好的吸能特性。在20 J、50 J和100 J冲击能量下,同等质量下的功能梯度夹层板比传统夹层板吸能分别提升7.54%、5.33%和8.65%。

The impact process and resistance capability of honeycomb plate with carbon fiber reinforced polymer(CFRP)face sheets were studied by using finite element model(FEM),and the FEM was verified by comparing with impact experiment.The density gradient was introduced into the traditional honeycomb structure by changing the wall thickness and the protection characteristics of functional gradient(FG)honeycomb sandwich plate under low-velocity impact(LVI)were simulated under different impact energies and gradient coefficientsα.The energy absorption characteristics of the FG and the traditional sandwich plate were compared through FEM.The results show that,under low impact energy,the honeycomb sandwich plate withα>1 has better energy absorption.With the increase of impact energy,the core with absorbing energy advantages changes gradually fromα>1 toα<1,when the whole sandwich plate is penetrated,the sandwich plate withα<1 has better energy absorption characteristics.Under the impact energy of 20 J,50 J and 100 J,the energy absorptions of functional gradient sandwich plates are 7.54%,5.33%and 8.65%higher than that of traditional sandwich plates with the same mass.