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研究了输电杆塔用玻璃钢纤维增强复合材料(glass fiber reinforced polymer,GFRP)在热氧老化环境下的抗老化性问题。对未经过任何老化处理的试件和热氧老化后的试件,分别测试其材料拉伸强度、弹性模量、泊松比等参数,并将这些参数进行了对比分析。试验结果表明,热氧老化环境对GFRP材料性能有明显影响,使其强度明显降低、弹性模量和泊松比有所提高,对未经过防护涂料处理试件的材料性能影响更明显。由老化经验公式可得,取强度保持率为50%作为寿终指标时,经过防护涂料处理的试件使用寿命可达35年。对长期暴露在不利环境下的GFRP输电杆塔进行设计时,应考虑外界环境的影响,并进行相应的防护处理。
The anti-aging of glass fiber reinforced polymer (GFRP) for transmission towers was investigated in a thermo-oxidative aging environment. The tensile strength, elastic modulus, Poisson’s ratio and other parameters were tested on the specimens without any aging treatment and after thermal aging. The parameters were compared and analyzed. The experimental results show that the thermal aging environment has a significant effect on the properties of GFRP materials, significantly reducing the strength, increasing the elastic modulus and Poisson’s ratio, and affecting the material properties of the GFRP material without the protective coating. By the aging experience formula available, to take the strength retention rate of 50% as the end of life indicators, after the protective coating treatment specimen life of up to 35 years. For long-term exposure to unfavorable environments, GFRP transmission towers should be designed with consideration of the external environment and corresponding protection measures.