二阶贝塞尔曲线型柔性铰链疲劳特性研究  

Study on Fatigue Characteristics of Second-order Bezier Curved Flexible Hinge

作　　者：汪启亮 夏世甜 魏健鸣 龙益平 WANG Qiliang;XIA Shitian;WEI Jianming;LONG Yiping(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学机电工程学院,江西赣州341000

出　　处：《机械科学与技术》2024年第11期1937-1944,共8页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金青年科学基金项目(51905239);江西省自然科学基金项目(20181BAB216019);江西省教育厅科技项目(GJJ170559);广东省精密装备与制造技术重点实验室开放课题(PEM201905)。

摘　　要：柔性铰链广泛应用于精密工程、MEMS、智能传感器等领域,在实际工作中因受到循环载荷作用而易发生疲劳失效问题。对二阶贝塞尔曲线型柔性铰链疲劳特性展开研究,首先通过有限元仿真和数据拟合得到铰链应力集中系数公式,基于名义应力法建立柔性铰链疲劳寿命预测模型。设计柔性铰链疲劳实验装置进行实验研究,得到铰链在不同应力下的刚度退化曲线及疲劳寿命,进而建立基于试验数据的S-N曲线模型,此外采用单侧下界公差极限法设计出考虑可靠性的下界S-N曲线模型。通过对比分析,柔性铰链对数疲劳寿命模型预测结果与试验结果最大误差为15.8%,表明了预测模型的有效性和实用性。Flexible hinge is widely used in precision engineering,MEMS,intelligent sensors and other fields,whose fatigue failure is likely to occur due to periodic load.In this paper,the fatigue characteristics of second-order Bezier curved flexible hinges were studied.Stress concentration factor formulation was obtained through fitting based on finite element simulation data.Fatigue life prediction model of the flexible hinge was established using the nominal stress method.Fatigue experiment was carried out on a fatigue test system.The stiffness degradation curve and S-N curve of flexible hinges under different stress levels were obtained.And the design S-N curve model accounting for confidence level and reliability was designed adopting the one-side lower-bound tolerance limit method.Comparison shows that the maximum error between the logarithmic fatigue life predicted value and the experimental results is 15.8%,which illustrates the effectiveness of the life prediction model.

关 键 词：柔性铰链 应力集中系数 疲劳试验 疲劳寿命 

分 类 号：TH114[机械工程—机械设计及理论]