高级检索

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 adhesive-riveted 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,1.25 m/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 adhesive-riveted hybrid joints, single-rivet and double-rivet adhesive-riveted hybrid joints were used as research objects, and dynamic tensile tests were conducted at loading rates of 0.5 m/s, 1.25 m/s, and 3.75 m/s, respectively. The force–displacement responses, peak force, and energy absorption indicators of the two types of joints under different loading rates were analyzed. The failure process of the joints was recorded and analyzed using digital image correlation technology, and the fracture morphology was observed by optical microscopy. The results indicate that the tensile force–displacement curve of GFRP/Al adhesive-riveted hybrid joints encompasses the overall load-bearing stage, adhesive layer failure stage, rivet load-bearing stage, and joint failure stage. The improvement of the loading rate has no significant effect on the peak force and energy absorption indicators. The average peak force and energy absorption of single-rivet adhesive-riveted hybrid joints are maintained at 3.3–3.7 kN and 13.2–13.7 J, respectively, while those of double-rivet adhesive-riveted hybrid joints are maintained at 6.2–6.4 kN and 26.6–30.4 J. In addition, the failure mode of the adhesive-riveted hybrid joints is sensitive to the loading rate. At high loading rates, the fracture and warping of the GFRP plate at the joint are the main failure modes. Meanwhile, compared with joints under low loading rates, the interlaminar failure of the GFRP plate is more severe, and the fracture shape is more regular.

     

/

返回文章
返回