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为探究泡沫夹层对自冲铆接头力学性能的影响,制备以AA5052铝合金为基板,泡沫镍、泡沫铜为夹层的自冲铆接头;通过拉伸-剪切试验研究接头的静失效载荷、失效位移及能量吸收能力,分析接头的失效形式及宏观失效机理;运用MATLAB对接头的静失效载荷和失效位移进行分析。结果表明:泡沫夹层对接头的成形质量影响显著,可增大接头的钉脚张开度,改善应力分布;1 mm泡沫镍夹层使接头静失效载荷增加8.9%;随着泡沫镍夹层厚度的增加,夹层结构自冲铆接头的抗拉强度呈降低趋势,但能量吸收值相对提升;泡沫铜夹层相对降低了接头的失效位移和能量吸收值,且其厚度对自冲铆接头的静失效载荷影响显著,泡沫铜夹层越厚,接头静失效载荷越低。泡沫夹层结构自冲铆接头的失效模式为铆钉脱离下板。
In order to investigate the influence of foam interlayer on the mechanical properties of self-piercing rivets, a self-piercing riveting joint with AA5052 aluminum alloy as substrate, foam nickel and foam copper as the interlayer was prepared. The static failure load and failure of joint were studied by tensile-shear test Displacement and energy absorption capacity of the joint failure analysis of the form and macro failure mechanism; the use of MATLAB static load failure of joints and failure displacement analysis. The results show that the foam interlayer has a significant effect on the forming quality of the joint, which can increase the nail opening and improve the stress distribution. The 1 mm foam nickel interlayer increases the static load of the joint by 8.9%. With the increase of the foam nickel interlayer thickness, The tensile strength of the self-piercing riveted joints decreases with the increase of the energy absorption. The foamed copper interbed decreases the failure displacement and the energy absorption of the joints, and the thickness of the foamed copper interlayers significantly affects the static failure load of the self-piercing riveted joints. The thicker the foam copper interlayer, the lower the static load of the joint. Foam sandwich self-piercing riveting joint failure mode for the rivet from the lower plate.