Abstract Secondary adhesive bonding of carbon fiber-reinforced polymer laminates is of great interest for the aerospace and automotive industries. However, joint reliability is still a major concern because of fabrication-induced or service-related cracks that are difficult to monitor and can lead to catastrophic failure. In this work, we propose a patterning strategy where the careful design of spatially-varying interface properties enables the formation of an adhesive ligament that acts as a crack-arrest feature. Bi-dimensional finite element models of adhesively bonded double cantilever beams were employed to investigate the role of the main parameters of the pattern ( i . e . , geometrical parameters and interfacial properties) under mode I loading. The results show that an adhesive ligament can either bridge the separating arms, largely enhancing the dissipated energy, or fail, thereby limiting the attainment of a R-curve-like response. The precise scenario is heavily dependent on the contrast in interfacial properties rather than the geometrical details of the pattern.

中文翻译：

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控制界面异质性以触发二次粘合复合材料接头中的桥接：引入止裂特征的有效策略

摘要 碳纤维增强聚合物层压板的二次粘合对航空航天和汽车工业具有重要意义。然而，由于制造引起的或与服务相关的裂纹难以监测并可能导致灾难性故障，因此接头可靠性仍然是一个主要问题。在这项工作中，我们提出了一种图案化策略，其中空间变化的界面特性的仔细设计能够形成作为止裂特征的粘合韧带。采用胶粘双悬臂梁的二维有限元模型来研究模式 I 加载下图案主要参数（即几何参数和界面特性）的作用。结果表明，粘性韧带可以桥接分离臂，大大提高耗散的能量，或失败，从而限制了 R 曲线式响应的实现。精确的场景在很大程度上取决于界面特性的对比，而不是图案的几何细节。