复合材料与高温合金螺栓连接结构高温振动防松试验研究

Anti-loosening Test of Composites and High-temperature Alloy Bolt Connection Structure under High-temperature and Vibration Circumstance

目的 针对温度补偿垫块和碟形垫片2种防松形式的复合材料与高温合金螺栓连接结构,进行高温振动环境下的防松试验研究。方法 推导连接结构预紧力与固有频率的关系,表明固有频率的变化可作为连接结构是否松动的判据。研究常温环境下螺栓预紧力对复合材料连接结构固有频率的影响,以及在常温、高温振动环境下温度补偿垫块和碟形垫片2种防松形式的热防松效果。结果 在常温振动环境下,2种防松形式的防松效果接近,在高温振动环境下,温度补偿垫块方案的防松效果优于碟形垫片方案。结论 复合材料与高温合金螺栓2种材料的热膨胀系数不一致引起的热适配问题是导致的螺栓松动的主要原因。

The work aims to conduct anti-loosening test of temperature compensation gaskets and disc gaskets,which are two forms of composites and high-temperature alloy bolted connection structures in high-temperature vibration environment.The relationship between the pretension force of the connection structure and the natural frequency was derived,indicating that the change of the natural frequency could be used as a criterion for whether the connection structure was loose.The effects of bolt pretension force on the natural frequency of composite connection structure in normal temperature environment were studied.And the thermal anti-loosening effects of temperature compensation gasket and disc gasket in normal temperature and high-temperature vibration environment were studied.The test results showed that the anti-loosening effect of the two forms of anti-loosening was close in the ambient vibration environment,and the anti-loosening effect of the temperature compensation gasket scheme was better than that of the disc gasket scheme in the high-temperature vibration environment.It is concluded that the thermal adaptation problem caused by the inconsistency of the thermal expansion coefficients of the two kinds of composite materials and high-temperature alloy bolts is the main reason for the loosening of the bolts.