复合材料/铝合金黏接-自冲铆接头力学性能

Mechanical properties of adhesive SPR joint of CFRP and aluminum alloy

为探究碳纤维复合材料黏接-自冲铆复合接头力学性能,对厚度为1.5 mm的碳纤维复合材料及5052铝合金板材分别进行自冲铆接,结合dp460环氧树脂黏接-自冲铆复合连接及黏接3种不同工艺制作单搭式接头,通过剖面直观检测分析法对接头成形进行质量评价,由拉伸-剪切试验获得各组接头的静破坏载荷及失效位移,并计算相应能量吸收值。结果表明:黏接-自冲铆复合连接工艺可以实现对碳纤维复合材料与5052铝合金板材的有效连接,其复合接头静破坏载荷比自冲铆接接头增加160%,为5 425.2 N;与黏接接头相比,黏接-自冲铆复合接头能量吸收能力更强,是前者的2倍;失效模式为在铆接位置发生纤维层断裂,黏接处发生混合破坏,搭接区域的5052铝合金板上出现纤维层残留;失效机理为铆钉刺入破坏纤维材料的连续性,在黏接剂的作用下断裂的纤维层黏接在上板并与下板分离。

To research the mechanical property of adhesive-self-piercing riveting(SPR)joint of carbon fiber reinforced polymer(CFRP),three different single lap joints of the CFRP with thickness of 1.5 mm and 5052 aluminum alloy plate were respectively produced by SPR,dp460 adhesive-SPR and adhesive connection,the quality of joint was evaluated by the method of visual inspection and analysis,the static failure load and displacement of each joint were obtained by tensile shear experiments,and the corresponding energy absorption value was calculated.The results show that adhesive-SPR joint process can effectively achieve the connection between CFRP and 5052 aluminum alloy sheet.The static failure load of the adhesive-SPR joint is increased by 160%compared with that of the SPR joint,which is 5 425.2 N.Compared with the adhesive joint,the adhesive-SPR joint has better energy absorption capacity,which is twice of the former.The failure mode of the adhesive-SPR joint is that the fiber layer breaks at the riveting position,the mixed destruction occurs at the adhesive position,and there is fiber layer remains on the 5052 aluminum alloy plate in the overlapping region.The failure mechanism is that the rivet piercing destroys the continuity of fiber material,and the fiber layer is broken under the action of the adhesive,which is bonded to the upper plate and separated from the lower plate.