纤维铺设角度和加载速率对复合材料圆管吸能特性的影响

Effect of Fibre Orientation and Loading Rate on Energy Absorption Capability of Composite Tubes

研究不同纤维铺设角度和加载速率对复合材料圆管轴向压溃变形过程、初始峰值载荷和比吸能的影响。对G827/5224碳纤维/环氧树脂和759/5224玻璃纤维/环氧树脂复合材料圆管进行了轴向压溃的准静态和冲击实验。实验结果表明:碳纤维/环氧树脂圆管随着纤维铺设角度的增大,比吸能明显下降,同时初始峰值载荷缓慢降低。而玻璃纤维/环氧树脂圆管的比吸能和初始峰值载荷随纤维铺设角度变化规律不明显;准静态和冲击实验结果对比发现加载速率对2种复合材料圆管能量吸收特性影响较小;2种复合材料圆管均具有稳定的轴向压溃变形和高的能量吸收效率。研究结果为这2类复合材料圆管作为能量吸收元件的设计提供了参考。

The effects of fiber orientation and loading rate on the deformation process,peak load and specific energy absorption of composite tubes were investigated.The axial crushing characteristic of two kinds of composite tubes made of G827/5224 carbon fiber/epoxy and 759/5224 glass fiber/epoxy were examined in both quasistatic and dynamic crush tests,respectively.The experimented results show that the specific energy absorption decreases obviously and the initial peak load declines slowly with the increase of fiber orientation angle for the carbon fiber/epoxy composite tubes;while these energy absorption characteristics do not change obviously for the glass/epoxy composite tubes;the loading rate has little effect on energy absorption of two composite tubes through comparing tested results between the quasi-static and dynamic;these two kinds of composite tubes have steady axial collapse deformation and high energy absorption capability.The investigated results can provide a reference for the application and design of these kinds of composite tubes as energy absorbers.