Study on the Law of Ultrasonic Vibration-Assisted Adhesive Bonding of CFRP-to-Aluminum Joints

Abstract

A novel ultrasonic vibration-assisted adhesion method for CFRP-to-aluminum joints is proposed. Extra force caused by ultrasonic vibration is introduced to reinforce the process of CFRP adhesion, which can overcome shortcomings in passive adhesion enhancement methods. The relationship between each ultrasonic vibration factor is explored, and the optimal ultrasonic vibration frequency, 15 KHz, is found. Through orthogonal experiment optimizing adhesive bonding process, it is found that the order of the influence of the factors on the adhesion strength is: Vibration time > Vibration amplitude > Vibration pressure > Vibration position, and the optimal ultrasonic vibration-assisted adhesive bonding of CFRP-to-aluminum joints (vibration time is 8s, vibration pressure is 0.40MPa, vibration position is 30mm and vibration amplitude is 56 μm) can improve adhesion strength by 40.14% and improve consistency of adhesion strength by 58.29%. This study provides a feasible and effective method for CFRP component adhesion.