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180 d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.
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