摘要
通过拉伸实验获得碳纤维增强聚醚醚酮复合材料(CF/PEEK)拉伸性能随温度的变化关系,并利用扫描电子显微镜观察断口形貌,研究分析了材料高温损伤机理。结果表明,随着环境温度的升高,碳纤维/PEEK的弹性模量与拉伸强度显著降低,在温度达到220℃时,分别下降89.20%和71.18%;断裂伸长率持续上升,在220℃时达到8.84%。弹性模量与断裂伸长率在T_g附近变化显著,主要原因是高温下纤维/树脂界面脱粘和树脂由玻璃态转化为高弹态后拉伸性能的显著变化。借助有限元方法计算由该材料制成的驾驶舱方向舵踏板在不同温度下的疲劳寿命,得出疲劳寿命随温度的升高而下降。在Coffin-Manson方程和通用斜率方程的基础上总结得出该材料疲劳寿命与温度的关系。
The effect of thermal behavior on tensile properties of 30% carbon fiber reinforced polyether-ether-ketone（ CF/PEEK） and the damage mechanism at high temperature was investigated. The fracture morphology of tensile sample was observed with SEM. Test results show that with the increase of the temperature,the elastic modulus and the tensile strength decrease dramatically while the elongation at break rises continuously. Fiber-matrix debonding,even the failure at the fiber-matrix interphase and glass transition of the matrix is the main reason of the decrease in the tensile properties. Finite element method（ FEM） was used to analyze the fatigue life of the rudder pedal made of this material in different environment temperatures. The fatigue life decreases with the increase of temperature. Based on the equation of Coffin-Manson and Manson＇s slopes equation,the relationship between fatigue life and temperature was built.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2016年第2期63-67,共5页
Aerospace Materials & Technology
基金
国家自然科学基金(青年基金)资助项目(51402356)
中央高校基本科研业务费专项(ZXH2012H006
Y15-29)
关键词
聚醚醚酮
复合材料
温度
拉伸性能
疲劳寿命
Polyether-ether-ketone
Composite materials
Temperature
Tensile properties
Fatigue life
