纤维增强树脂基复合材料芯模拟湿热老化性能

为研究碳纤维导线主要受力载体——碳纤维复合芯棒在湿热、高温等环境下性能的变化,通过湿热老化和热暴露试验,从失重率、拉伸强度、弯曲强度以及玻璃化转变温度(Tg)等方面分析了复合芯棒性能的衰减情况,并通过模型预测了碳纤维导线的使用寿命。结果表明,湿热老化后芯棒的Tg和拉伸强度有所降低,弯曲强度有所提高;热暴露试验中,随着热暴露时间的增加,芯棒的Tg略微降低,拉伸强度基本无变化,质量略微减少;通过模型得出碳纤维复合芯在156.5℃的环境中经过40年,其性能才衰减30%失效,所以在正常使用条件下,碳纤维导线使用寿命可以得到保障。

Properties of Fiber Reinforced Resin Matrix Composite Cores Simulating Wet and Hot Aging

In order to study the performance changes of carbon fiber composite cores——the main force carriers of carbon fiber wires under hot and humid environment,the attenuation of composite cores was analyzed from the aspects of weight loss rate,tensile strength,bending strength and glass transition temperature(Tg)through hygrothermal aging and heat exposure test,and the service life of carbon fiber conductors was predicted through the model.The results show that the Tg and tensile strength of the mandrel decrease and the bending strength increases after hygrothermal aging.In the heat exposure test,with the increase of the heat exposure time,Tg of mandrel decreases slightly,tensile strength basically remains unchanged,and mass decreases slightly.According to the model,the performance of the carbon fiber composite core only attenuates 30%to failure after 40 years at 156.5℃.Therefore,the service life of the carbon fiber conductor can be guaranteed under normal service conditions.