碳纤维复合材料湿热老化加速关系

受环境因素作用,碳纤维增强聚合物基复合材料(Carbon fiber reinforced polymer composities,CFRP)湿热环境下发生性能退化是一个重要的工程问题,而如何通过实验室加速试验再现自然环境对复合材料的老化作用成为解决此问题的关键。基于时间-温度-湿度等效原理,将湿热环境下CFRP粘弹性能的改变作为材料的老化损伤度量,建立不同湿热环境之间当量折算关系,提出加速老化当量折算系数的确定方法。以典型军机结构用CFRP为例,实例计算了材料不同温度、湿度环境下的当量折算系数,根据地面停放环境谱当量折算得到加速试验谱,加速效果令人满意。最后,对比分析了温度与湿度对当量折算系数的影响,结果表明,温度变化对当量折算系数的影响要比湿度变化的影响显著。

Accelerated Relationship of Hygrothermal Aging for Carbon Fiber/Polymer Composites

Affected by environment elements, the degeneration of mechanical property for ca r bon fiber reinforced polymer (CFRP) composites under hygrothermal environments i s an important engineering problem, and the key segment on solving this problem i s how to reappear the aging effect of natural environment on CFRP by taking acce lerated aging experiments under laboratory condition. Based on time-temperature-humidity superposition principle (TTHSP), the change of visco elasticity for CFRP is considered as damage measure for Hygrothermal aging. The equivalent convers ion relationship between different Hygrothermal environments is determined, and the calculating method of equivalent conversion coefficient is provided. Takin g a typical CFRP used in warcraft structure for example , equivalent conversion co efficients under different hygrothermal environments are calculated, the accel e rated aging environment spectrum are programmed according to the conversion of ground parking environment spectrum, and the accelerating result is acceptable . Finally, the influences of temperature and humidity on equivalent conversion c oefficient are checked, and the result shows that the influence of temperature c ha nge on equivalent conversion coefficient is more remarkable than that of humidi ty change.