Structural adhesive joints used in aerospace are usually subjected to fatigue loading rather than static loading. This study experimentally and numerically investigated the static four-point bending loads of adhesively bonded joints after fully reversed four-point bend fatigue loading where nanoadhesives – obtained by adding carbon nanostructures into aerospace grade structural adhesive – were used to bond the joints. Single lap joint specimens were produced using a nanocomposite adhesive obtained by adding 1 wt % graphene, 1 wt % carbon nanotubes-COOH and 1 wt % fullerene C60 nanostructures to a DP460 structural adhesive. AA2024-T3 aluminum alloy and carbon fiber-reinforced composites (CFRCs) with a plain weave fabric (0/90°) were used as adherend materials. First, static four-point bending tests were applied to these joints to obtain their strengths and then fully reversed sinusoidal fatigue tests were applied under a constant load amplitude, a frequency of 20 Hz and a load ratio of R = −1. Fatigue tests were performed over 1,000,000 cycles – accepted as an infinite life – at four different load levels by considering the strengths obtained from the static tensile tests. After obtaining the static four-point bending strengths of the joints to which fatigue loading was applied, the changes in the strengths of joints with and without fatigue testing were examined. The static strengths of aluminum joints bonded with nanoadhesive and subjected to fully reversed fatigue loading significant increased, depending on the nanostructure type added to the adhesive. Moreover, such increases in the strengths of joints are highly dependent on the adherend type (composite with [0/90]₆ stacking sequence or AA2024-T3 aluminum).

航空航天中使用的结构胶接头通常承受疲劳载荷而不是静载荷。这项研究通过实验和数值研究了在完全反向四点弯曲疲劳载荷后胶粘接头的静态四点弯曲载荷，其中纳米粘合剂 - 通过将碳纳米结构添加到航空级结构胶粘剂中 - 用于粘合接头。使用通过将 1 重量％石墨烯、1 重量％碳纳米管-COOH 和 1 重量％富勒烯 C60 纳米结构添加到 DP460 结构粘合剂中获得的纳米复合粘合剂生产单搭接接头样品。AA2024-T3铝合金和具有平纹织物（0/90°）的碳纤维增强复合材料（CFRC）用作被粘材料。第一的，对这些接头进行静态四点弯曲试验以获得它们的强度，然后在恒定载荷振幅、20 Hz 频率和 R = -1 载荷比下进行完全反向正弦疲劳试验。通过考虑从静态拉伸试验中获得的强度，在四种不同的载荷水平下进行了超过 1,000,000 次循环（被认为是无限寿命）的疲劳试验。在获得施加疲劳载荷的接头的静态四点弯曲强度后，检查了经过和不经过疲劳试验的接头强度的变化。使用纳米粘合剂粘合并承受完全反向疲劳载荷的铝接头的静态强度显着增加，具体取决于添加到粘合剂中的纳米结构类型。而且，₆堆叠顺序或 AA2024-T3 铝）。