摘要
研究了2D-C/C复合材料的热膨胀性能以及疲劳加载条件对其热膨胀性能的影响规律,分别进行了应力水平为70%、90%及循环周次为104、5×104、1×105和1.5×105次的弯-弯疲劳试验,并随后测试其热膨胀性能。结果表明,疲劳加载并没有改变其热膨胀性能随温度升高而增大的变化规律,但对比不同疲劳加载条件下2D-C/C复合材料的热膨胀性能,可发现疲劳加载后试样的热膨胀性能随着应力水平和循环周次的增大有降低趋势。经分析认为,这主要是由于疲劳加载过程中产生的各种疲劳损伤所致。
The thermal expansion behavior of 2D-C/C composites and the effect of fatigue loading conditions on the thermal expansion of the composites were studied.The flexural fatigue experiment was made under the stress level of 70% and 90%,cycling times of 104,5×10^4,1×10^5 and 1.5×10^5,and then the thermal behavior was investigated.The results show that fatigue loading didn＇t change the variation law that thermal expansion behavior is improved with the increased temperature.However,compared with the thermal expansion behavior of 2D-C/C composites at different fatigue loading conditions,the thermal expansion behavior of the samples after fatigue loading drops with increasing of the stress level and cycling times,which is due to the all kinds of fatigue damages generated during the fatigue loading.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2012年第5期665-669,共5页
Journal of Solid Rocket Technology
基金
凝固技术国家重点实验室基金(G8QT0222)
国家自然科学基金重点项目(50832004)
深圳大学深圳市场特种材料重点实验室开放基金资助项目(T0906)
关键词
2D-C
C复合材料
物理热膨胀系数
工程热膨胀系数
疲劳加载
疲劳损伤
C/C composites
coefficient of physical thermal expansion
coefficient of thermal expansion project
fatigue loading
fatigue damage
