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拉伸速度对GFRP/铝合金胶铆接头拉伸性能的影响

Effect of loading rate on tensile properties of GFRP/Al alloy bonding-riveting hybrid joints

  • 摘要: 为研究加载速度对GFRP/Al胶铆接头拉伸性能的影响,以单钉胶铆连接和双钉胶铆连接接头为研究对象,对其分别开展了0.5 m/s,1.25m/s和3.75 m/s的动态拉伸试验,分析两种接头在不同加载速度下的力−位移响应、峰值力和吸能量指标,利用数字图像相关技术记录和分析接头的失效过程,通过光学镜观察分析接头的断裂形貌. 结果表明,GFRP/Al胶铆接接头的拉伸力−位移曲线包含整体承载、胶层失效阶段、铆钉承载和接头失效阶段;加载速度的提高对峰值力和吸能量指标无明显影响,单钉胶铆连接接头的平均峰值力和吸能量维持在3.3 ~ 3.7 kN和13.2 ~ 13.7 J,双钉胶铆连接接头的平均峰值力和吸能量维持在6.2 ~ 6.4 kN和26.6 ~ 30.4 J;此外,胶铆接头的失效模式对加载速度具有敏感性,在高加载速度下,接头处GFRP板的断裂和翘曲是主要的失效模式;同时与低速加载的接头相比,GFRP板层间失效更严重,断口形状更规则.

     

    Abstract: In order to investigate the effect of loading rate on the tensile properties of GFRP/Al bonding-riveting hybrid joints, bonding-single riveting and bonding-double riveting hybrid joints were selected as the research subjects. Dynamic tensile tests were conducted at loading rates of 0.5 m/s, 1.25 m/s, and 3.75 m/s, respectively. The load-displacement responses, peak load, and energy absorption of the two types of joints under different loading rates were analyzed. The failure process was recorded and analyzed using digital image correlation (DIC) technology, and the fracture morphology was examined via optical microscopy. The results indicate that the tensile force-displacement curve of GFRP/Al adhesive riveted joints encompasses the overall load-bearing capacity, adhesive layer failure stage, rivet load-bearing capacity, and joint failure stage; Increasing the loading rate exhibited no significant effect on the peak load and energy absorption. The average peak load and energy absorption of the bonding-single riveting hybrid joints remained within 3.3 ~ 3.7 kN and 13.2 ~ 13.7 J, respectively, while those of the bonding-double riveting hybrid joints remained within 6.2 ~ 6.4 kN and 26.6 ~ 30.4 J. Furthermore, the failure modes of the bonding-riveting joints showed sensitivity to the loading rate. At high loading rates, fracture and warping of the GFRP laminates at the joint region were identified as the primary failure modes. Compared to joints tested at low loading rates, interlaminar failure of the GFRP laminates was more severe, and the fracture morphology appeared more regular.

     

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