ABSTRACT Fiber metal laminates (FMLs) are hybrid materials consisting of metals and fiber-reinforced composite materials. The characteristics of interfaces between metal layers and layers of composites directly determine the damage tolerance and impact resistance of FMLs. In this study, the effects of surface pre-treatment and adhesive quantity on the interface of FMLs were investigated. Aluminum substrates were treated with sandpaper and anodizing. The treated surface structure and joint shear strength were evaluated to analyze the bonding interface quality. The results show that the surface roughness, structure and thickness of the anodized films affect the interface characteristics and adhesion strength. A porous oxide layer was formed on the substrate surface after anodization, resulting in a better wetting surface than that of sanded. Moreover, statistical analysis of the surface structures reveals that the shear strength of phosphoric acid anodizing treatment was higher than other anodizing. With the increase in adhesive layers, the lap shear strength was markedly improved at the beginning but slowly increased thereafter. From the results, the surface pre-treatment and adhesive quantity could be optimized to improve the manufacturing process of FMLs. Graphical Abstract

中文翻译：

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表面预处理和粘合剂用量对纤维金属层压板界面特性的影响

摘要 纤维金属层压板（FML）是由金属和纤维增强复合材料组成的混合材料。金属层与复合材料层之间的界面特性直接决定了 FML 的损伤容限和抗冲击性。在这项研究中，研究了表面预处理和粘合剂数量对 FML 界面的影响。铝基板用砂纸和阳极氧化处理。对处理后的表面结构和接头剪切强度进行评估，以分析结合界面质量。结果表明，阳极氧化膜的表面粗糙度、结构和厚度会影响界面特性和附着强度。阳极氧化后在基材表面形成多孔氧化层，导致润湿表面优于砂光。此外，表面结构的统计分析表明，磷酸阳极氧化处理的剪切强度高于其他阳极氧化处理。随着胶粘剂层数的增加，搭接剪切强度开始显着提高，之后逐渐增加。从结果来看，可以优化表面​​预处理和粘合剂数量，以改进 FML 的制造工艺。图形概要