ABSTRACT Acrylic adhesives offer design flexibility with its viscoelasticity. However, its use with composite parts has not been studied. In this regard, the aim of this work is to characterise the mode I delamination of acrylic adhesive bonded composite joints subjected to various displacement rates. This study used carbon/epoxy composite as the adherent and 3M adhesive film (VHB 4930F) as the adhesive. Double cantilever beam test was conducted and the mode I fracture toughness GIC was calculated using the simple beam theory. Results show that GIC increases with displacement rate. The maximum GIC is achieved at 500 mm/min, with 155% increment compared to the GIC at 5 mm/min. Furthermore, the cohesive failure is found to be more dominating as the displacement rate increases. Through the quantification of the cohesive area, it is noticed that both GIC and cohesive area correlate well. Both parameters are well fitted using the proposed rate-dependent model.

中文翻译：

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模式I加载下丙烯酸粘合剂粘合碳/环氧树脂复合材料接头的位移速率依赖性

摘要丙烯酸粘合剂以其粘弹性提供设计灵活性。然而，尚未研究它与复合部件的使用。在这方面，这项工作的目的是表征丙烯酸粘合剂粘合复合材料接头在不同位移率下的 I 型分层。本研究使用碳/环氧树脂复合材料作为粘合剂，使用 3M 粘合膜 (VHB 4930F) 作为粘合剂。进行了双悬臂梁试验，并使用简单梁理论计算了 I 型断裂韧性 GIC。结果表明，GIC 随置换率的增加而增加。最大 GIC 达到 500 毫米/分钟，与 5 毫米/分钟的 GIC 相比增加了 155%。此外，随着位移速率的增加，内聚破坏被发现更加占主导地位。通过对内聚面积的量化，值得注意的是，GIC 和内聚面积都具有很好的相关性。使用建议的速率相关模型，这两个参数都很好地拟合。