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在HJDS-Ⅱ型动力模拟试验机上对某型号航空炭刹车副进行连续低速刹车试验,研究摩擦因数与连续刹车次数和刹车副体容温度三者之间的关系,并对摩擦性能进行分析。结果表明:在连续低速刹车条件下,炭刹车副的体容温度随刹车次数增加而缓慢均匀升高。根据航空C/C复合材料摩擦因数随体容温度的变化规律,可将摩擦过程分为4个区域:环境温度摩擦区(温度低于80℃,摩擦因数稳定并小于0.15)、突变摩擦区(温度为80~120℃,摩擦因数突增到0.3)、水解吸的粉尘摩擦区(温度为120~650℃,摩擦因数达到低温峰值0.33后小幅回落,然后缓慢上升)和氧解吸的粉尘摩擦区(温度高于650℃,摩擦因数超过低温峰值)。过多地使用连续低速刹车易导致炭刹车副温度过高和轮胎拖胎,严重威胁飞机安全。
The continuous low-speed brake test was carried out on HJDS-Ⅱ dynamic simulation test machine to study the relationship between the friction coefficient and the number of continuous braking and braking body temperature, and the friction performance was analyzed. The results show that under the condition of continuous low speed brake, the body temperature of the carbon brake assembly increases slowly and slowly with the increase of brake times. According to the variation law of the friction coefficient of C / C composites, the friction process can be divided into four areas: ambient temperature friction zone (the temperature is lower than 80 ℃, the friction coefficient is stable and less than 0.15) The temperature of 80 ~ 120 ℃, the friction coefficient suddenly increased to 0.3), the frictional area of water desorption of dust (temperature of 120 ~ 650 ℃, the friction coefficient of 0.33 after the low temperature peak fell slightly, and then slowly rise) and oxygen desorption dust friction zone (Temperature above 650 ° C, friction factor exceeds low temperature peak). Excessive use of continuous low-speed brakes can easily lead to excessive temperature of carbon brakes and tire drop tires, posing a serious threat to aircraft safety.