Abstract A commonly used design for the repair of carbon fibre reinforced polymers (CFRP) is the bonded scarf joint. As contaminations on the adherend surface or bondline flaws can reduce the bonding strength drastically, the effect of such strength reducing phenomena has to be known. This is also the case for bonded joints that had to sustain hot-wet conditions. Therefore, the aim of this study was to investigate the influence of weak bonds and hot-wet conditioning on the mechanical properties of scarf bonded CFRP joints. Circular zones of weak bonding have been artificially produced by application of release agent on the adherend surface. Different sizes and locations were studied. Additionally, two scarf ratios and two lay-ups have been investigated, to account for different stress states in the bondline. The investigation showed that the effect of a weak bond on bond strength is strongly dependent on the location, size and lay-up of the adherend, while hot-wet conditioning reduces the bond strength in all cases.

中文翻译：

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考虑热湿调节的包含圆盘状弱粘合区的围巾粘合 CFRP 修复的强度

摘要 一种常用的修复碳纤维增强聚合物（CFRP）的设计是粘合围巾接头。由于被粘物表面的污染或胶层缺陷会大大降低粘合强度，因此必须了解这种强度降低现象的影响。对于必须承受湿热条件的粘合接头也是如此。因此，本研究的目的是研究弱粘合和热湿调节对围巾粘合 CFRP 接头力学性能的影响。通过在被粘物表面上施加脱模剂，人为地产生了弱结合的圆形区域。研究了不同的大小和位置。此外，还研究了两个围巾比率和两个叠层，以解释胶层中的不同应力状态。