两种玻璃纤维增强复合材料体系的湿热老化研究

玻璃纤维增强复合材料在湿热环境下性能的退化是工程研究中待解决的问题,而实验室人工加速老化则是较好地研究该问题的常用方法。通过人工加速老化方法,结合露天储水环境,研究两种玻璃纤维增强复合材料在35℃水浸泡、65℃水浸泡及盐雾三种环境下的吸水率、巴氏硬度和弯曲强度的变化,并运用两种模型预测材料的使用寿命。研究表明:不同湿热环境下,材料的巴氏硬度前期变化明显,后期趋向稳定;吸水率基本符合Fick定律;温度对弯曲强度保留率影响显著,盐雾影响次之;中值老化公式比经验公式拟合度高7.6%。

STUDY ON HYDROTHERMAL AGING OF TWO KINDS OF GLASS FIBER REINFORCED COMPOSITE

The degradation of glass fiber reinforced composite materials (GFRP) in hydrothermal environment is a problem to be solved in the engineering research.Artificial accelerated aging method is a good and common way to study hydrothermal aging.In this paper,two different systems of glass fiber/resin were investigated by artificial accelerated aging method combined with open water storage environment,which reinforced composite materials in the environment of 35 ℃ water immersion,65 ℃ water immersion and salt spray.The properties of mechanical,water absorption,hardness,bending strength were investigated and the service life were predicted by two models.The study shows that the hardness of the material changes obviously in the early period,and tends to be stable in the later stage.The water absorption rate almost fit the Fick law.The temperature has a significant effect on the retention rate of the flexural strength,and the salt spray is the second factor.The median aging formula has a higher fitting degree than the empirical formula,which even exceed by 7.6％.