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动静压受感器的外接管在振动实验过程中发生断裂现象。采用金相显微镜、扫描电镜等方法对X-1、X-2、X-3三个动静压受感器的外接管进行断口形貌分析、理化检测分析。结果显示动静压受感器外接管开裂与材料无关。通过系列振动参数测试发现断裂原因为外接管在低频振动时,悬空端振幅大,固定端在共振力的作用下发生疲劳断裂。最终证实采用阻尼方法降低振幅是防止动静压受感器外接管在振动中发生断裂的有效措施。
Hydrostatic pressure sensor outer tube fracture occurred in the vibration test. X-1, X-2 and X-3 were measured by metallographic microscope and scanning electron microscope (SEM), respectively. The results show that the static and dynamic pressure sensor outer tube cracking has nothing to do with the material. Through the series of vibration parameters, it is found that the reason of fracture is that when the external pipe vibrates at low frequency, the amplitude of the dangling end is large, and the fatigue fracture occurs at the fixed end under the action of the resonance force. Finally, it is confirmed that the use of damping method to reduce the amplitude is an effective measure to prevent the static and dynamic pressure from being broken in the vibration of the outer tube of the sensor.