碳纤维增强铝合金层合方管轴向吸能特性

为减轻薄壁吸能结构质量、提高结构能量吸收性能,制备碳纤维增强铝合金层合方管试样。对方管试样进行准静态轴向压缩试验,研究碳纤维增强铝合金层合方管的变形模式和机理。提出分段碳纤维复合材料层合方管的设计方法;并对其轴向吸能特性进行对比验证。结果表明,外层碳纤维复合材料与内层铝合金材料的界面出现脱层断裂,内层铝合金材料对方管变形起到了引导作用,外层碳纤维复合材料阻碍铝合金材料的折叠变形,碳纤维增强层合方管较原铝合金方管有效压缩能量提高了35.79%,压缩力效率提高了28.38%;而分段碳纤维增强铝合金层合方管还能有效降低初始峰值压缩力,提高薄壁结构压缩力效率,压缩力效率较原来提高了13.53%,进一步提升碳纤维增强薄壁结构的吸能特性。

Axial Crashworthy Capacity of Carbon Fiber Reinforced Aluminum Laminates Tube

The carbon fiber reinforced aluminum laminates tube were prepared with epoxy resin reinforced carbon fiber overwrapped on an aluminum columnar tube to improve the crashworthy capacity of lightweight thin-walled structures. Quasi-static crush tests were applied for the specimens of carbon fiber reinforced aluminum laminates tubes with axial loading to investigate their deformation mode and mechanism. A method of piecewise carbon fiber reinforced aluminum laminates tube was proposed for the verification the improvement of axial crashworthy capacity of the thin-walled tube. The results showed that the improvement of efficiency of energy absorption for the carbon fiber reinforced aluminum laminates tube was due to the induction fold deformation of the aluminum alloy tube and the resistance effect of the carbon fiber composites. The specific energy and crushing force efficiency of the carbon fiber reinforced aluminum laminate tube was 35.79% and 28.38% higher than the aluminum alloy tube respectively. The fracture of laminates was presented on the interface of carbon fiber composites and aluminum alloy. The axial crashworthy capacity of the piecewise carbon fiber reinforced laminates tube was further improved by the decreasing of initial peak crush force to increase the efficiency of crush force. The crushing force efficiency of the piecewise reinforced tube was 13.53% higher than the carbon fiber reinforced laminates tube.