Study on water absorption and interfacial properties of CFRP and GFRP composites in hygrothermal environment

doi:10.19936/j.cnki.2096-8000.20241028.012

Abstract

Abstract: The mechanical properties of fiber reinforced resin composites (FRP) deteriorate under hygrothermal environment, which will affect its service performance and life. In this paper, the water absorption and diffusion behavior of pultruded carbon fiber and glass fiber reinforced composite (CFRP and GFRP) rods in distilled water at 40 ℃, 60 ℃ and 80 ℃, as well as the short beam shear strength degradation rule of rods were studied, the life prediction model of short beam shear strength was established based on time-temperature equivalent principle. The results show that the GFRP rod has lower water diffussion rate and saturation water absorption rate. Water molecules and immersion temperature are the key factors affecting the deterioration of short beam shear strength. Under low immersion temperature, the short beam shear strength rapidly degrades with the ingression of water molecules. High temperature exposure at 80 ℃ accelerated the debonding of glass fiber-resin interface, resulting in the degradation rate of short beam shear strength of GFRP rod is much higher than that of CFRP rod. The long-term life prediction results show that the stable short beam shear strength retention rate of CFRP rod is 77.4%, while the short beam shear strength of GFRP rod is completely lost under long-term immersion.

Key words: FRP rods, hygrothermal durability, short beam shear strength, time-temperature equivalent, life prediction

CLC Number:

TB332

ZHANG Ousheng, LI Chenggao, NIU Yanzhao, TIAN Jingwei, XIAN Guijun, GUO Rui. Study on water absorption and interfacial properties of CFRP and GFRP composites in hygrothermal environment[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(10): 87-96.

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