Abstract The composite panels have high strength-to-weight ratio. Adhesive connections are the most common methods of joining in composites. The composite connections are being used in industries such as aerospace, automotive, marine and etc. Low strength is one of the disadvantages of the adhesive connections. Strength improvement is considered in different researches. In this study, using a button shape edge is considered as a new method for strengthening the adhesively bonded composite connections. The effect of geometrical parameters of the button shape edge was investigated numerically and experimentally. These parameters are the radius and height of the button. The influences of the type of the adhesive was also considered in this study. Increasing the radius up to six times the adherent thickness, increased the strength of the joints, significantly. For the optimized geometry (Height = Radius = six times the adherent thickness), the load-bearing capability of the adhesive joint increased up to 300%. Numerical studies showed that the maximum of peel and shear stresses also reduce about 160% and 70%, respectively, for the optimal case. It was also obtained that the height diminution increased the peel and shear stresses in the button shape connections.

中文翻译：

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使用按钮形状互锁特征的粘合剂复合接头加固

摘要 复合板具有较高的强度重量比。粘合连接是复合材料中最常见的连接方法。复合连接件被用于航空航天、汽车、船舶等行业。低强度是粘接连接的缺点之一。在不同的研究中考虑了强度的提高。在这项研究中，使用按钮形状的边缘被认为是一种加强粘合复合材料连接的新方法。通过数值和实验研究了按钮形状边缘几何参数的影响。这些参数是按钮的半径和高度。本研究还考虑了粘合剂类型的影响。将半径增加到粘附厚度的六倍，增加了接头的强度，显着地。对于优化的几何形状（高度 = 半径 = 粘合厚度的六倍），粘合接头的承载能力增加了 300%。数值研究表明，在最佳情况下，剥离应力和剪切应力的最大值也分别降低了约 160% 和 70%。还获得了高度减小增加了纽扣形状连接中的剥离和剪切应力。