EFFECT OF SURFACE TREATMENT ON BOND STRENGTH OF THE BASE LAMINATE AND REPAIR PATCHES

Abstract

Abstract: In the process of repairing composite materials, the bonding strength between the base laminate, the film and the patches is the main factor affecting the repairing effect. The surface treatment is often used to improve the bonding repair strength. In this paper, the composite material was ablated using a high-frequency pulsed ultraviolet laser, and the surface of the composite was polished with 38 μm (400 mesh) sandpaper followed by low temperature plasma treatment, and then the surface of the composite was polished again with 38 μm (400 mesh) sandpaper. The phase characteristics of the composite surface were analyzed by X-ray photoelectron spectroscopy. The tensile shear strength of the joint after surface treatment was tested by lap test. The shear failure mechanism of the lap joint was analyzed according to the experimental phenomenon. The results show that the shear strength of the specimen after laser treatment and sandpaper plus plasma treatment is higher than that of the specimen after sanding, which is increased by 17.9% and 10.9%, respectively. Laser ablation and plasma treatment can improve surface activity. The oxygen-containing functional group is increased, and the oxygen content is 2.2 times and 1.7 times that of the original surface, respectively.

Key words: bondingrepair, laser stripped, sandpaper sanding, plasma, tensile-shear strength

CLC Number:

TB332

XIONG Yu-cheng, BA De-ma, LI Chang-qing, CUI Hai-chao. EFFECT OF SURFACE TREATMENT ON BOND STRENGTH OF THE BASE LAMINATE AND REPAIR PATCHES[J]. Fiber Reinforced Plastics/Composites, 2019, 0(9): 100-104.

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