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Durability of adhesively bonded CFRP-aluminum alloy joints subjected to coupled temperature and alternating load
International Journal of Adhesion and Adhesives ( IF 3.4 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.ijadhadh.2020.102583
Wenlong Mu , Jingxin Na , Wei Tan , Guangbin Wang , Hao Shen , Xiaoying Li

Abstract The degradation of carbon fiber reinforced polymers (CFRPs) adhesive structures with exposure to combined temperature and alternating load has become a critical issue for safety considerations of CFRPs utilized in automotive, railway and other industries. However, the aging mechanism is not clearly understood. This paper presents an experimental study on the durability of adhesively bonded CFRP-aluminum alloy (CFRP-Al) joints subjected to a coupled temperature and alternating load. The effect of the CFRP surface roughness on adhesive performance was investigated, and then the optimal bonding scheme was determined. The joint performance was measured at −40 °C, −10 °C, 25 °C (room temperature, RT), 50 °C and 80 °C, and the durability tests of joints with exposure to separate alternating loads, temperatures and the combined effects were conducted with a special loading apparatus. The failure modes were investigated using visual observation and scanning electron microscopy (SEM) to explain the failure mechanism. The influences of temperature and alternating loads on the strength of joints were statistics analysis by the two-way analysis of variance (ANOVA). The results show that the adhesive property of the CFRP can be effectively improved by sandpaper polishing, and with decreasing roughness, the bearing capacity of the CFRP-Al joint increases. The failure strength of joints decreases with increasing temperature, especially when the test temperature is close to or greater than the glass transition temperature (Tg) of the adhesive. As the number of cycles of the alternating load increase, the joint strength declines slowly and then quickly. Exposure to a continuous increasing temperature also results in a decrease in the joint strength; this decrease is mainly due to the fiber/matrix interface damage of the CFRP at 80 °C, while it is determined by the degradation of the adhesive layer at other temperatures. Under the coupled action of temperature and loading, the damage occurs prevailingly in the adhesive layer, and the harmful effect of the alternating load is more significant in a high temperature environment.

中文翻译:

受耦合温度和交变载荷作用的粘合 CFRP-铝合金接头的耐久性

摘要 碳纤维增强聚合物 (CFRPs) 粘合剂结构在暴露于温度和交变载荷下的降解已成为用于汽车、铁路和其他行业的 CFRPs 安全考虑的关键问题。然而,老化机制尚不清楚。本文提出了一项关于在耦合温度和交变载荷下粘合 CFRP-铝合金 (CFRP-Al) 接头耐久性的实验研究。研究了CFRP表面粗糙度对粘接性能的影响,进而确定了最佳粘接方案。接头性能在 -40 °C、-10 °C、25 °C(室温,RT)、50 °C 和 80 °C 下进行测量,以及暴露于单独交变载荷下的接头耐久性测试,温度和综合效应是用特殊的加载装置进行的。使用目视观察和扫描电子显微镜 (SEM) 研究失效模式以解释失效机制。温度和交变载荷对接头强度的影响采用双向方差分析(ANOVA)进行统计分析。结果表明,砂纸抛光可以有效提高CFRP的粘接性能,并且随着粗糙度的降低,CFRP-Al接头的承载能力增加。接头的破坏强度随温度升高而降低,尤其是当测试温度接近或高于粘合剂的玻璃化转变温度 (Tg) 时。随着交变负载循环次数的增加,关节强度缓慢下降,然后迅速下降。暴露在持续升高的温度下也会导致接头强度降低;这种下降主要是由于 CFRP 在 80 °C 下的纤维/基体界面损坏,而它是由胶粘剂层在其他温度下的降解决定的。在温度和载荷的耦合作用下,损伤主要发生在胶层,交变载荷的危害在高温环境下更为显着。
更新日期:2020-06-01
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