Nowadays, the adhesive bonding method has a very strong presence in the most varied industries, especially in aeronautics, which strongly boosted the use of adhesively bonded joints. Curved bonded joints are commonly used in the aeronautical industry, where curved panels typically made of carbon fibre-reinforced polymer (CFRP) are joined to fabricate several fuselage parts. This work compares the performance of three adhesives (brittle, moderately ductile and ductile) in curved single-lap joints (SLJ) bonded with CFRP adherends, considering the modifications of the following geometric parameters: overlap length (L_O), adherend thickness (t_P) and adherends’ radius of curvature (R). For the analysis of these joints, the finite element method (FEM) was used with cohesive zone model (CZM), and the discussions of joint behaviour included the internal stresses of the adhesive, joint strength and energy dissipated at failure (U). Before the numerical analysis, validation with experiments was carried out considering flat SLJ, with positive results. The numerical study on the curved SLJ showed a significant maximum load (P_m) and U improvement by increasing L_O for the two ductile adhesives. For the same adhesives, bigger t_P reduced P_m. On the other hand, the brittle adhesive revealed to be only minor affected by these parameter variations. Thus, with this work, clear design guidelines are proposed for curved SLJ.

如今，粘合剂粘合方法在各种行业中都非常流行，尤其是在航空领域，这极大地促进了粘合剂粘合接头的使用。弯曲的粘合接头通常用于航空工业，其中通常由碳纤维增强聚合物（CFRP）制成的弯曲面板连接在一起以制造几个机身部件。考虑到以下几何参数的修改，这项工作比较了三种粘合剂（脆性，中度延性和延性）在与CFRP被粘物粘合的弯曲单搭接接头（SLJ）中的性能，其中包括重叠长度（L _O），被粘物厚度（t _P）和被粘物的曲率半径（R）。为了分析这些接缝，将有限元方法（FEM）与内聚区模型（CZM）结合使用，对接缝行为的讨论包括胶粘剂的内应力，接缝强度和破坏时的能量耗散（U）。在进行数值分析之前，考虑使用平面SLJ进行了实验验证，并获得了积极的结果。对弯曲SLJ的数值研究表明，通过增加两种延展性胶粘剂的L _O可以显着提高最大载荷（P _m）和改善U值。对于相同的粘合剂，较大的t _P减少P _m。另一方面，脆性粘合剂受这些参数变化的影响很小。因此，通过这项工作，提出了针对弯曲SLJ的明确设计准则。