关键词: 碳纤维复合管, 胶接, 拉伸性能, 破坏载荷, 复合材料

Abstract: The influence of bonding length, adhesive layer thickness and external tightening firmware on the failure load for a carbon fiber composite tube-aluminum alloy joint connected by adhesive were investigated through tensile tests. The results show that the failure load increases with the bonding length first but decreases from a critical bonding length, while it decreases with the adhesive layer thickness monotonously. As the bonding length and adhesive layer thickness increase, the dominant mechanism for the rupture of the joint is shifted from the failure of the composite material and partial of the adhesive layer to the failure of tube-adhesive interfacial bonding and overall adhesive layer. By applying a tightening firmware on the adhesive surface, the stripping stress caused by some additional bending moments can be cancelled, thereby the joint gets strengthened. With a bonding length of 100 mm, an adhesive layer thickness of 0.01 mm~ 0.02 mm and three unevenly spaced fasteners, the adhesive joint can withstand a maximum load of up to 255 kN.

Key words: carbon fiber composite tube, adhesive, tensile properties, failure load, composites