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室温下C/SiC复合材料螺纹紧固件的拧紧特性

, PP. 164-170

Keywords: 陶瓷基复合材料,紧固件,摩擦系数,预紧力,磨损

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Abstract:

探讨了C/SiC陶瓷基复合材料螺纹紧固件在室温下的拧紧特性。试验测试了紧固件在拧紧和拧松过程中,力矩与预紧力两者的对应关系,记录了预紧力在短时、长时内的减小比率,并用显微镜观察了螺纹面的磨损情况。另外,分析了材料非线性拉伸行为对拧紧状态所造成的影响。结果表明:拧紧、拧松力矩与预紧力之间近似呈线性关系,螺纹面和支承面的平均摩擦系数分别为0.52和0.46;随拧紧力矩增大,螺纹面产生一定程度磨损,螺纹之间的相互嵌入作用减弱,因此预紧力在拧紧后的降幅减小,稳定性提高;对螺栓进行适当的预拉伸处理,提高材料的弹性极限后,可提高紧固件的抗松弛能力。

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