摘要
通过研究4个温湿度条件下吸湿性能、红外光谱、微观形貌及材料力学性能的变化,分析了T300/648复合材料的湿热老化机理。以材料力学性能下降到初始性能的70%作为失效判据,利用广义艾林模型计算得到T300/648复合材料贮存寿命的预测值。结果表明复合材料吸湿速率随温度升高而变大,且材料趋于饱和时的吸湿量主要由相对湿度控制。老化一定时间后化学结构不变,但由于界面产生了不可逆的破坏,使得纤维与基体脱粘,最终导致材料的力学性能产生退化,并且退化速率随温湿度的升高而加快。使用广义艾林模型计算后得到寿命预测结果与实际构件设计寿命吻合良好。
The mechanism of hygrothermal ageing of T300/648 composite was analyzed by studies of mois ture absorption properties, infrared spectra, microscopic morphology and changes of mechanical property. The storage life of T300/648 composite was calculated by Generalized Eyring model with a failure criterion that mechanical property of T300/648 composite dropped to seventy percent of the initial mechanical prop erty. The results show that moisture absorption rate of T300/648 composite increased with temperature, and the amount of moisture absorption which materials tend to be saturated was mainly controlled by the relative humidity. After ageing for a period of time, resin chemical structure of 3300/648 composite re mained unchanged, damage which made up with the increase but the mechanical properties of T300/648 composite decreased due to the irreversible the fiber and matrix debond. The degradation rates of mechanical properties speeded of aging temperature and humidity. The storage life calculated by Generalized Eyring model was well agreed with designed life of actual comnonent madeof T300/648 composite.
出处
《四川兵工学报》
CAS
2013年第11期137-140,共4页
Journal of Sichuan Ordnance
关键词
复合材料
湿热老化
广义艾林模型
寿命预测
composite
hygrothermal ageing
Generalized Eyring model
life prediction
