铝合金/碳纤维超混杂薄壁吸能结构的制备及性能研究

纤维/金属超混杂复合管在提高整体结构碰撞吸能性能的同时又具有显著的轻量化效果,在吸能结构材料应用领域具有良好的应用前景和优势.通过热压成形与螺栓连接相结合的方法制备铝合金/碳纤维超混杂薄壁吸能结构,讨论不同尺寸的双耳端结构、螺栓连接位置与数目在轴向压溃下对薄壁吸能结构失效行为及吸能性能的影响.试验结果表明:双耳端尺寸与螺栓位置影响结构的层间结合性能,双耳长度为12、18 mm时容易造成应力集中,从而影响结构在轴向压溃下的失效形式与吸能特性;螺栓连接数目影响结构的强度与层间结合性能,5螺栓连接的薄壁吸能结构拥有最优吸能性能与失效形式.

Preparation and Performance Study of Aluminum Alloy/Carbon Fiber Super-hybrid Thin-walled Energy Absorption Structures

Fiber/metal super hybrid composite tubes have good application prospects and advantages in the application of energy-absorbing structural materials, as they not only improve the overall energy absorption performance in crash scenarios but also have significant lightweight effects. In this paper, aluminum alloy-carbon fiber super hybrid thin-walled energy-absorbing structures are prepared by a combination of hot pressing and bolted connections. The effects of different sizes of binaural end structures, bolt connection positions and quantities on the failure behavior and energy-absorbing properties of the thin-walled energy-absorbing structures under axial compression are discussed. The results show that the size of the binaural end and the position of the bolts affect the interlayer bonding performance of the structure, and the length of the binaural of 12 mm and 18 mm is easy to cause stress concentration, which affects the failure behavior and energy-absorbing properties of the structure under axial compression collapse; the number of bolt connections affects the strength and interlayer bonding performance of the structure, and the thin-walled energy-absorbing structure with five bolts at each binaural end has the optimal energy-absorbing performance and failure form.