残余应力对柔性薄壁连接结构固有频率的影响  

Effect of residual stress on natural frequency of thin-walled component

作　　者：高梁 昝祥[2] 李艳 邓华夏[1] 王宇[1] 龚兴龙[1] GAO Liang;ZAN Xiang;LI Yan;DENG Huaxia;WANG Yu;GONG Xinglong(CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,Anhui,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei230009,Anhui,China)

机构地区：[1]中国科学技术大学近代力学系中国科学院材料力学行为与设计重点实验室,安徽合肥230027 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《实验力学》2024年第2期149-157,共9页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(12372187);同步辐射联合基金项目(KY2090000097)。

摘　　要：对于光束线系统中的精密部件而言,线切割加工过程往往会造成部件表面产生残余应力,从而使得精密部件的振动特性与设计预期产生偏差,影响电子束流的稳定性。本文通过对柔性薄壁连接试件固有频率的测量,结合数字图像相关方法和有损切割法对薄壁连接处残余应力进行分析,并结合有限元法分析了残余应力对柔性薄壁连接试件的固有频率影响,从而对光束线系统中柔性铰链部件的固有频率与设计值的偏差进行了探究,研究结果可为柔性薄壁连接部件振动特性设计提供依据。For precision components in synchrotron radiation light source,the wire EDM often induces residual stresses on the component surfaces,leading to deviations from the expected vibration characteristics in the design,which can affect the stability of the electron beam.This paper measured the natural frequency of a flexure thin-walled connection specimen,and analyzed the residual stress at the flexure hinges using both the digital image correlation method and the notching method.Furthermore,the finite element method was employed to probe into the effect of residual stress on the natural frequency of the flexure hinge.The investigation helps to explore the deviation between the measured flexure hinge and the designed one and offers a design foundation for understanding the vibration characteristics of the thin-walled components.

关 键 词：残余应力 柔性铰链 固有频率 

分 类 号：TG48[金属学及工艺—焊接]