电热处理对湿热环境作用下碳纤维环氧复合材料的损伤机制

发布时间：2018-08-07 16:07

【摘要】：对T300/E51复合材料进行电热处理、湿热老化以及电热吸湿处理,从弯曲性能、吸湿率、基体化学结构、玻璃化转变温度、弯曲断口等方面揭示电热处理对湿热老化的影响机制。研究结果表明:原始试样经湿热处理后发生部分水解,4 A电热+湿热处理试样的后固化比较明显,6 A电热+湿热处理试样没有发生明显的变化。后固化作用引起的界面裂纹尺寸减小导致4 A电热试样的吸湿率下降;玻璃化转变温度的变化规律与弯曲性能的变化规律类似。详细的分析表明,T300/E51复合材料经电热处理后其损伤机制与传统的吸湿损伤机制有所不同,玻璃化转变温度代替吸湿率成为衡量复合材料性能变化的重要因素。微观结构分析显示电热处理产生的温度梯度和压缩应力使得基体微裂纹增多,再经湿热处理后,溶胀广泛存在于整个基体中,进而导致弯曲性能降低。
[Abstract]:The effects of electrothermal treatment, hygrothermal aging and electrothermal moisture absorption on T300/E51 composites were investigated in terms of bending property, moisture absorption rate, matrix chemical structure, glass transition temperature, bending fracture and so on. The results show that the solidification of the original sample treated by hygrothermal treatment has no obvious change. The decrease of interfacial crack size caused by post-solidification results in the decrease of moisture absorption rate of 4A electrothermal specimen, and the change of glass transition temperature is similar to that of bending property. The detailed analysis shows that the damage mechanism of T300 / E51 composites after electrothermal treatment is different from the traditional mechanism of hygroscopic damage. Glass transition temperature instead of moisture absorption rate is an important factor to evaluate the properties of the composites. Microstructure analysis shows that the temperature gradient and compression stress produced by electrothermal treatment increase the number of microcracks in the matrix. After hydrothermal treatment, swelling widely exists in the whole matrix, which leads to the decrease of bending performance.
【作者单位】：江苏大学材料科学与工程学院;中国民航大学天津市民用航空器适航与维修重点实验室;
【基金】：国家自然科学基金(61471364) 中国民航大学开放基金(151001A) 江苏省博士后基金(1501159B) 江苏大学高级人才科研启动基金(14JDG127)资助项目
【分类号】：TB332;TQ327.3

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