在复杂的振动环境中，一种特定结构的压力传感器经常出现内引线断裂的失效现象。通过对内引线断截面及断口侧面的观察，确定为振动疲劳断裂。应用机械振动和模态分析理论，将转接引线的力学模型简化为伯努利-欧拉梁，通过自由振动偏微分方程计算其基频，与有限元软件计算的结果进行比对，证明建立的有限元模型能够准确反映传感器的动力学状态。应用该有限元模型，进行模态和振型的计算，寻求致使内引线断裂失效的原因，并将计算结果与试验结果对比，证明寻找的失效原因的正确性。
Abstract
In a complex vibration environment,some kind of pressure sensors with specific structure may often meet the case of internal down-lead fracture due to vibration fatigue,which can be determined through the observation of internal down-lead cross section and fracture profile. The mechanical model of the lead wire was simplified as a Bernoulli-Euler beam. Its fundamental frequency was calculated theoretically and compared with the results of finite element analysis. It is proved that the finite element model can reflect the dynamics of sensor accurately. Applying proper finite element,a modal analysis was carried out,the results of calculation and test were compared,and the reason of fracture,revealed by the analysis,was proved to be correct.
关键词
压力传感器 /
失效机理 /
有限元 /
谐振 /
疲劳断裂
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Key words
pressure sensor /
failure mechanism /
finite element /
resonance oscillation /
fatigue fracture
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