Carbon nanotubes (CNTs) are generally considered as a promising particle reinforcement of incorporating advanced properties and characteristics into epoxy nanocomposites. This paper investigated the bonding performances of CNT-reinforced epoxy adhesively bonded joints on steel substrates using the single lap shear (SLS) tests. The bonding performances (including bonding strength, fracture strain, toughness, and failure mode) were studied with three adhesive thicknesses (1 mm, 0.5 mm, and 0.25 mm) and three CNT weight fractions (0%, 0.375%, and 0.75%). The experimental results indicated that thinner bondlines and higher CNT additions could significantly improve the bonding performances and modify the failure mode of CNT-reinforced epoxy adhesively bonded joints. However, the effects of adhesive thickness became less significant with the increase of CNT weight fractions. In addition, the plastic behaviour of CNT-reinforced epoxy, CNTs pulling-out, and the aggregation of CNTs were observed by scanning electron microscopy (SEM) image analysis on the fracture surfaces of CNT-reinforced epoxy adhesively bonded joints, indicating the potential effectiveness of the CNT reinforcement.

碳纳米管 (CNT) 通常被认为是一种很有前途的粒子增强材料，可以将先进的性能和特性融入环氧纳米复合材料中。本文使用单搭接剪切 (SLS) 测试研究了碳纳米管增强环氧树脂胶粘接头在钢基材上的粘合性能。使用三种粘合剂厚度（1 mm、0.5 mm 和 0.25 mm）和三种 CNT 重量分数（0%、0.375% 和 0.75%）研究了粘合性能（包括粘合强度、断裂应变、韧性和失效模式） . 实验结果表明，更薄的粘合线和更高的 CNT 添加量可以显着提高粘合性能并改变 CNT 增强环氧树脂胶粘接头的失效模式。然而，随着 CNT 重量分数的增加，粘合剂厚度的影响变得不那么显着。此外，通过扫描电子显微镜 (SEM) 图像分析对 CNT 增强环氧树脂粘接接头的断裂表面进行了观察，观察了 CNT 增强环氧树脂的塑性行为、CNT 拔出和 CNT 聚集情况，表明其潜在的有效性。碳纳米管增强。