Study on Effect of Ultrasonic Vibration on Adhesive-film Bonding of Al/CFRP Alloy Joints

Abstract The adhesive film is solid at room temperature, and it is difficult to ensure the adhesion of the adhesive film to the adhered plate during the bonding process, resulting in poor bonding quality and difficult bonding quality control. Due to the need to solve this problem, this study proposed ultrasonic to improve the bonding quality. The ultrasonic mechanism to strengthen the adhesive-film bonded of AL/CFRP (carbon fiber reinforced composites) joints was investigated. The ultrasonic vibration was applied to the bonding area after the adhesive film was attached. A double-lap shear plate test revealed a 59.6% increase in bond strength and a 34.2% increase in bond quality stability. By analyzing the temperature and viscosity of the adhesive film after ultrasonic and observing the surface morphology of the cured joint, it was found that ultrasonic could reduce the film viscosity and improve the adhesive film fluidity. At the same time, the adhesive film was promoted to fill the irregular micro pits on the adherend surface, enhancing the mechanical anchoring effect between the adhesive and the adhered plate and thus improving the bonding quality.