柔性铰链机构柔节疲劳寿命的设计及研究

Fatigue-life design of flexible segments for the flexible mechanism

围绕基于迈克尔逊干涉仪傅里叶变换光谱仪的动镜支撑机构——柔性铰链机构的柔节疲劳寿命问题,先通过相关公式计算选取出机构柔节的各个参数,并由这些参数建立机构的有限元模型;然后再根据材料属性参数,利用疲劳分析软件msc.fatigue,通过拟合疲劳寿命S-N曲线来对机构的柔节参数进行仿真验证。从分析结果可知:柔节破坏点的寿命循环次数均为5.83×105次,在Nf(1×105～1×107)范围之内,属于高周疲劳范畴,材料在此寿命循环次数内处于弹性范围,应力与应变成正比。验证了柔节各参数及材料的合理性,进而了解整个机构的寿命情况。

Surrounding the question of flexible segment fatigue life for the flexible mechanism, the supporting mechanism of moving mirrors based on Michelson interferometer in Fourier-Transform spectrometer, related formulas are used to determine the parameters by which a finite element model is established for the flexible segments; then, according to the properties of these materials, a S-N curve of fatigue-life is fitted to validate the simulation results for the flexible segments by the use of fatigue analysis software msc. fatigue. The results show that the number of life cycle is totally 5. 83×10^5 , within the scope of N f（1 ×10^5～1×10^7）, which belongs to the category of high-cycle fatigue. The materials within the number of life-cycle belongs to the scope of stress, and its stress is proportional to its strain,which proves the reason- ability of the materials and parameters of flexible segments. Therefore, the conclusion is helpful to understand the life condition of the whole mechanism.