压力传感器位移分析及疲劳寿命预测

完成了依据有限元疲劳分析为基础的传感器寿命预测研究工作。阐述压力传感器工作原理,定义影响系统寿命的参数组,既包含力学环境参数,亦包括材料属性、几何形式等结构参数。针对不同参数属性,依据疲劳强度计算需求,构建有限元数值计算模型;根据影响传感器寿命的传感单元单晶硅S-N(应力-循环)分布,完成变载荷输入条件下模型疲劳分析,依据数值计算结果完成该压力传感器寿命预测工作。结果表明:压力传感器使用寿命在7.068E8次数以上。本课题研究提出的新方法,摆脱了传统依靠试验完成多种材料组成结构体的疲劳分析及寿命预测窘境,具有通用性。

Pressure Sensor Displacement Analysis and Fatigue Lifetime Prediction

The research on the fatigue prediction of the GJB pressure sensor based finite element analysis is finished. Work principle of the sensor is demonstrated, the parameters including loading, materials and geometries for different parts, which influence the lifetime prediction are defined. According to the different parameter attributes, and based on the calculation requirements of fatigue strength, the numerical calculation model of finite element is established. Then according to the S-N (Stress-Number) distribution of sensor element, Si, which influences the lifetime of the pressure sensor, the model fatigue analysis in the variable load input condition is finished. Finally, according to the numerical calculation results, the life prediction work of pressure sensor is completed. The results show that the service life of the sensor is more than 7.068E8 times. This project proposes a new method, and innovates the traditional method which to complete the fatigue analysis for composition structure of many materials, and gets out of the awkward situation of lifetime prediction. It is of universality.