热带海洋环境下 GFRP 纤维−树脂界面早期性能研究

Characterization of early-stage performance of fiber-resin interface in GFRP exposed to tropical ocean environment

摘要

针对热带海洋环境下 GFRP 早期服役性能演化规律不明晰的问题，开展了原位暴露（大气、潮汐、浸泡）与加速老化（紫外、盐雾、紫外+盐雾耦合、紫外+凝露循环）相对应的对比研究。通过宏观力学测试与微观表征手段，揭示了不同环境下纤维−树脂界面粘结性能的退化规律及劣化机理。研究结果表明：GFRP 筋在含紫外辐射影响的环境下，层间剪切强度均呈现先升后降的变化规律；GFRP 筋的层间剪切强度受紫外+盐雾耦合环境的影响最显著，紫外+盐雾 40 d 试件强度下降 18.19%；通过 FTIR 与 SEM 分析验证了树脂基体在后固化、水解和分子链断裂等协同作用下，纤维−树脂界面由致密状态逐渐转变为粗糙并伴随脱粘的结构特征。

Abstract

The early-stage service performance evolution of glass fiber reinforced polymer (GFRP) bars in tropical marine environments remains insufficiently understood. To address this, a comparative study was conducted using in-situ exposure tests (atmospheric, tidal, and seawater immersion) alongside accelerated aging tests (ultraviolet radiation, salt spray exposure, UV+salt spray coupling, and UV+condensation cycling). Macroscopic mechanical testing combined with microstructural characterization was employed to reveal the degradation behavior and deterioration mechanisms of the fiber-resin interfacial bonding under various environmental conditions. The results indicate that in environments involving UV radiation, the interlaminar shear strength (ILSS) of GFRP bars initially increase and then decrease. The UV+salt spray coupled environment has the most pronounced effect on ILSS, leading to an 18.19% reduction after 40 days of exposure. Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) analyses verify that, due to the synergistic effects of post-curing, hydrolysis, and molecular chain scission of the resin matrix, the fiber-resin interface gradually transitions from a dense state to a rough structure accompanied by debonding.

关键词

GFRP 筋 / 热带海洋环境 / 层间剪切强度 / 微观结构 / 性能演化

Key words

GFRP bars / tropical ocean environment / interlaminar shear strength / microstructure / performance evolution

作者贡献声明

李昆锦负责设计实验方案、数据采集、数据分析和撰写初稿。陈天宇负责数据采集和数据分析。赵菲负责设计实验方案。王立负责对论文提出关键修改意见和逻辑调整。周智提供学术指导、方向把握、提供实验设备和经费支持。

AI使用声明

本文的英文题名、摘要和关键词采用DeepSeek翻译生成，并进行了部分修改。

利益冲突声明

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伦理声明

不适用：本文未涉及人类或动物的实验。

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