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The experimental assessment of the various surface modifications on the tensile and fatigue behaviors of laminated aluminum/aramid fibers-epoxy composites
International Journal of Fatigue ( IF 5.7 ) Pub Date : 2021-09-24 , DOI: 10.1016/j.ijfatigue.2021.106560
Mojtaba Shamohammadi Maryan 1 , Hossein Ebrahimnezhad-Khaljiri 2 , Reza Eslami-Farsani 2
Affiliation  

Fiber metal laminates (FMLs) are introduced as the kind of advanced hybrid composites consisting of the metals and composite layers, which the adhesion between those has an important role on the static and dynamic mechanical properties of these structures. To do so, the mechanical abrading, alkaline etching, forest products laboratory (FPL) and anodizing surface modification methods were performed on the 2024 aluminum for fabricating aramid fiber-reinforced aluminum laminate (ARALL). After that, by using tensile and fatigue tests as well as micro/macro-structural investigations, the static and dynamic mechanical properties of ARALL structures were studied. Based on the fatigue results at the stress level of 90%, the mechanical surface modification caused that the fatigue cycles reached to 2155 cycles, which was the highest fatigue cycles. Whereas in the stress level of 45%, the anodizing surface modification with the 34,420 fatigue cycles had the highest improvement. Given up the tensile results, the FPL and anodizing surface modified FMLs had the highest tensile strength, which were 317 and 319 MPa, respectively. The microstructural investigations showed that by using the various surface modification methods, the absorbing energy mechanisms of fatigue loadings by aramid fibers changed. Also, changes in the number and diameter of formed dimples in the aluminum skins were seen.



中文翻译:

各种表面改性对层压铝/芳纶纤维-环氧树脂复合材料拉伸和疲劳行为的实验评估

纤维金属层压板(FMLs)是一种由金属和复合材料层组成的先进混合复合材料,它们之间的粘附对这些结构的静态和动态力学性能具有重要作用。为此,对2024铝进行了机械研磨、碱性蚀刻、林产品实验室(FPL)和阳极氧化表面改性方法,以制造芳纶纤维增强铝层压板(ARALL)。之后,通过拉伸和疲劳试验以及微观/宏观结构研究,研究了 ARALL 结构的静态和动态力学性能。根据应力水平为 90% 时的疲劳结果,机械表面改性导致疲劳循环达到 2155 个循环,这是最高的疲劳循环。而在 45% 的应力水平下,34,420 次疲劳循环的阳极氧化表面改性具有最高的改进。考虑到拉伸结果,FPL 和阳极氧化表面改性 FML 的拉伸强度最高,分别为 317 和 319 MPa。微观结构研究表明,通过使用各种表面改性方法,芳纶纤维吸收疲劳载荷的能量机制发生了变化。此外,还观察到铝皮中形成的凹坑的数量和直径的变化。微观结构研究表明,通过使用各种表面改性方法,芳纶纤维吸收疲劳载荷的能量机制发生了变化。此外,还观察到铝皮中形成的凹坑的数量和直径的变化。微观结构研究表明,通过使用各种表面改性方法,芳纶纤维吸收疲劳载荷的能量机制发生了变化。此外,还观察到铝皮中形成的凹坑的数量和直径的变化。

更新日期:2021-09-27
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