处理铝合金与碳纤维板材粘接工艺性能实验及数值模拟研究

发布时间：2018-02-03 06:47

本文关键词： 铝合金碳纤维板材微小沟槽内聚力模型胶接　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着新型轻质材料在汽车、飞机和轮船等结构轻量化中的应用,采用传统连接方式无法满足金属和非金属的连接要求。胶接技术除具有良好的连接性能,且具有耐疲劳、耐电位腐蚀、能防腐以及优异密封性能等优点,因此将胶接技术用于异质材料粘接逐渐成为新的研究热点。本文以铝合金和CFRP粘接件为研究对象,对粘接工艺进行研究,主要研究内容和研究成果如下:(1)对粘接工艺中的粘接体表面处理、固化工艺、胶瘤等参数进行实验研究,采用砂纸粗化铝合金表面,能够起到增加粘接面积和机械锁固的作用,但胶粘剂浸润效果较差,造成接头粘接强度降低;确定最佳的固化温度和时间,并对溢胶对粘接件的影响进行了研究,固化工艺对胶层转化起到重要作用,实验件胶层较薄,胶瘤的强化效果并不明显。(2)利用内聚力有限元模拟光面及微沟槽表面铝合金与CFRP接头的粘接强度,微沟槽表面铝合金对接头起到粘接强化作用;沿搭接宽度方向沟槽胶层的应力分布相同,接头粘接强度随搭接宽度的增加呈线性增大;搭接长度对胶层整体应力影响明显,而对端部的影响效果较小,且随着搭接长度增加其比强度值降低,即剪切强度和搭接长度的比值减小;相比搭接长度,增加搭接宽度对接头进行强化更加有效。(3)研究不同沟槽深度、宽度以及角度的表面微沟槽铝合金与CFRP接头粘接强度、粘接失效形貌,得出随着沟槽深度、宽度的增加,粘接体非自由端剥离应力和剪切应力及粘接强度得到提高;当沟槽角度由水平方向转到45°时,接头应力分布均匀且粘接强度最大;当沟槽角度达到90°时,接头应力局部集中明显且粘接强度最弱。(4)研究表面带有微沟槽的铝合金用于Al/CFRP/Al三层板结构层间粘接强度和阻尼性能的影响。结果表明:微沟槽表面铝合金做层板基体能有效强化层间粘接强度和对层板阻尼性能无消极作用。
[Abstract]:With the application of new lightweight materials in the light weight of automobile, aircraft and ship, the traditional connection method can not meet the requirements of metal and non-metal connection. And has the fatigue resistance, the potential corrosion resistance, the ability anticorrosion as well as the excellent sealing performance and so on. Therefore, adhesive bonding technology has gradually become a new research hotspot. In this paper, the bonding process of aluminum alloy and CFRP bonding parts is studied. The main research contents and research results are as follows: (1) the surface treatment, curing process, glue nodule and other parameters of bonding process are studied experimentally. Sand paper is used to roughen the surface of aluminum alloy. It can increase the adhesive area and mechanical locking, but the adhesive wetting effect is poor, resulting in the joint bonding strength decreased; The optimum curing temperature and time were determined, and the influence of the spills on the adhesive parts was studied. The curing process played an important role in the conversion of the adhesive layer, and the adhesive layer of the experimental part was thin. The bonding strength between smooth surface and micro-groove surface aluminum alloy and CFRP joint was simulated by cohesion finite element method, and the bonding strength of micro-groove surface aluminum alloy to the joint was enhanced. The stress distribution of the groove layer along the lap width is the same, and the bonding strength increases linearly with the increase of the lap width. The effect of lap length on the overall stress of the adhesive layer is obvious, but the effect on the end part is less, and the specific strength value decreases with the increase of the lap length, that is, the ratio of shear strength to lap length decreases. Compared with the lap length, it is more effective to strengthen the joints by increasing the lap width.) the bonding strength between the surface micro-groove aluminum alloy and CFRP joints with different groove depth, width and angle is studied. With the increase of groove depth and width, the non-free end peeling stress, shear stress and bonding strength of the adhesive are increased. When the groove angle is shifted from horizontal to 45 掳, the stress distribution of the joint is uniform and the bonding strength is the largest. When the groove angle reaches 90 掳. Joint local stress concentration is obvious and bonding strength is weakest. The effects of aluminum alloy with micro-grooves on the interlaminar bonding strength and damping properties of Al/CFRP/Al laminates were investigated. Aluminum alloy on the surface of micro-grooves can effectively strengthen the interlaminar bonding strength and has no negative effect on the damping properties of the laminates.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG496

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