The effect of moisture absorption-drying on the microstructure of the bonding interface of composite materials

doi:10.19936/j.cnki.2096-8000.20221028.012

Abstract

Abstract: In order to study the effect of moisture absorption-drying on the microstructure of the bonding interface of composite materials, three various approaches including grinding, dry peel ply and wet peel ply are firstly used to treat the surface of the composite material, and then moisture absorption-drying treatment at 26 ℃, 65%RH and 70 ℃, 85%RH are conducted. OM, SEM, FTIR, XPS are used to study the effect of moisture absorption-drying on the morphology and composition of the bonding interface of composite materials. The physical morphology analysis shows that the composite material treated with dry peel ply will be residual fiber tows on the surface after it absorbs moisture at 26 ℃, 65%RH, which will affect the single-lap shear strength. The composite materials treated with grinding and wet peel ply do not show significant change after moisture absorption-drying at 26 ℃, 65%RH. After the composite materials are placed at 70 ℃, 85%RH to absorb moisture, there is a phenomenon of matrix cracking, and the polyester fiber tow remains on the surface of the composite material treated with dry peel ply. The above phenomenon will reduce single-lap shear strength, and cannot be recovered after drying. The chemical composition analysis indicates that the O element percentage of the composite material surface treated with wet peel ply decreases after absorbing moisture in these two systems, and can not be recovered after drying. In addition, polyester fiber tow remains on the surface of the material treated with dry peel ply, which changes the O element content.

Key words: moisture absorption-drying, microstructure, peel ply, bonding, composites

CLC Number:

TB332

ZHANG Wei-rui, QIN Meng-lan, CHEN Chen, GU Ling-cong, YAO Dong-dong, ZHENG Ya-ping. The effect of moisture absorption-drying on the microstructure of the bonding interface of composite materials[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(10): 76-84.

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