ABSTRACT Adhesive fillet has been proposed to improve the mechanical performance of adhesively bonded corrugated sandwich structures, but limited research can be found focusing on the effect of adhesive fillet on the stress state within the ABCSS. In this work, an experimental-FE modelling work was carried out to study the effect of adhesive fillets on the mechanical performance of adhesively bonded corrugated sandwich structures (ABCSS) under 3-point bending load. Three-point bending tests were conducted for model verification in the numerical analysis procedure on adhesively bonded corrugated sandwich structures. Additionally, load–displacement curves have been deduced to determine the load-bearing capacity and failure performance of the corrugated sandwich structures. Cohesive Zone Model (CZM) was adopted for damage analysis in the adhesive layer as well as the fillet, while detailed discussion on the stress distribution caused by various adhesive fillet geometrical dimensions was also addressed. It can be judged that increasing the fillet size can provide a smoother transition between the adhesive layer and adherend, and thus reduce the stress concentration at the edge of the overlap region. It was concluded that enhancing the size of adhesive fillets led to the better mechanical performance of the adhesively bonded corrugated sandwich structure.

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粘合圆角对粘合瓦楞夹层结构力学性能的影响：实验-数值研究

摘要 粘合圆角已被提议用于提高粘合波纹夹层结构的机械性能，但在 ABCSS 内粘合圆角对应力状态的影响方面的研究有限。在这项工作中，进行了实验性有限元建模工作，以研究粘合剂圆角在 3 点弯曲载荷下对粘合波纹夹层结构 (ABCSS) 机械性能的影响。进行了三点弯曲试验，以在粘合瓦楞夹层结构的数值分析过程中进行模型验证。此外，还推导出了载荷-位移曲线，以确定波纹夹层结构的承载能力和破坏性能。采用内聚区模型（CZM）对胶层和圆角进行损伤分析，同时详细讨论了各种胶粘剂圆角几何尺寸引起的应力分布。可以判断，增大圆角尺寸可以使粘合剂层和被粘物之间的过渡更加平滑，从而减少重叠区域边缘处的应力集中。得出的结论是，增加胶粘剂圆角的尺寸会导致胶粘波纹夹层结构的机械性能更好。可以判断，增大圆角尺寸可以使粘合剂层和被粘物之间的过渡更加平滑，从而减少重叠区域边缘处的应力集中。得出的结论是，增加胶粘剂圆角的尺寸会导致胶粘波纹夹层结构的机械性能更好。可以判断，增大圆角尺寸可以使粘合剂层和被粘物之间的过渡更加平滑，从而减少重叠区域边缘处的应力集中。得出的结论是，增加胶粘剂圆角的尺寸会导致胶粘波纹夹层结构的机械性能更好。