CFRP/Al复合管的制备及吸能特性研究

Preparation and Energy Absorption Characteristics of CFRP/Al Hybrid Tubes

纤维/金属超混杂复合管作为吸能结构材料具有良好的应用前景和优势,基于旋压成形工艺制备2/1结构碳纤维复合材料/铝合金(CFRP/Al)复合管,采用无损检测和层间剪切强度试验来表征CFRP/Al复合管的层间结合性能,并且通过准静态压溃试验研究CFRP/Al复合管的吸能特性。研究结果表明,所制备的CFRP/Al复合管层间分层缺陷少,层间结合性能沿管轴向和径向方向分布稳定,平均层间剪切强度可达31.04MPa。准静态轴向压溃下CFRP/Al复合管内铝合金层变形模式为钻石式模式,外铝合金层变形模式为手风琴式模式,中间CFRP层在内外铝合金层和层间界面结合作用下发生渐进式失效,破碎程度充分;CFRP/Al复合管吸收能量比对应单一铝合金管和CFRP管之和提高了35%,具有优异的吸能性能。

Fiber composites/metal hybrid tubes have good application prospects and advantages as energy absorbing structures.In this paper,the 2/1 structure carbon fiber reinforced plastic/aluminum alloy(CFRP/Al)hybrid tube was prepared by spinning forming process.The interlayer bonding properties were characterized by nondestructive testing and inter-laminar shear strength tests.The energy absorption characteristics were investigated based on quasistatic crushing tests.The results indicated that the prepared hybrid tube had few lamination defects and the interlayer bonding performance was stable along the axial and radial directions of the tube.The average interlayer shear strength was up to 31.04 MPa.The deformation mode of the inner aluminum layer was diamond mode while the outer aluminum layer showed concertina mode under quasi-static axial crushing.The CFRP layer collapsed in a progressive mode with sufficient fragmentation under the effect of inner and outer aluminum layers and interlayer bonding.The CFRP/A1 hybrid tube had excellent energy absorption performance,which showed 35%higher energy absorption than the sum of the corresponding single aluminum and CFRP tubes.