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通过重物加载,并在氯离子环境中浸泡不同试验周期后,测试玻璃纤维增强不饱和聚酯(GFRP)复合材料的吸湿率,研究GFRP在不同应力水平下的吸湿规律。结果表明:浸泡初期GFRP的吸湿率随时间增长较快,随后吸湿率增长逐渐变慢,当浸泡达到180d后,吸湿率下降;GFRP的吸湿率随载荷的增加而下降,受到不同载荷大小的试件其吸湿率随时间变化规律相似;GFRP在氯离子环境中的吸湿行为呈现non-Fickian特征。基于Langmuir模型并考虑由于材料水解而发生材料“失重”的吸湿特性,提出了可描述复合材料吸湿曲线上升和下降趋势的吸湿模型,该模型可以较好地预测GFRP的吸湿量。
The moisture absorption of glass fiber reinforced unsaturated polyester (GFRP) composites was tested by loading heavy objects and immersing in different test cycles in chloride environment. The moisture absorption laws of GFRP at different stress levels were studied. The results showed that the moisture absorption rate of GFRP increased rapidly with the increase of time, and then the moisture absorption rate gradually became slower. After soaking for 180 days, the moisture absorption rate of GFRP decreased. The moisture absorption rate of GFRP decreased with the increase of load. The moisture absorption rate changes with time similar; GFRP in the chloride ion environment showed non-Fickian hygroscopic behavior. Based on the Langmuir model and taking into account the hygroscopic characteristics of the material due to the hydrolysis of the material, a moisture absorption model describing the rising and falling trend of the hygroscopic curve of the composite is proposed. The model can predict the moisture absorption of GFRP well.