基于DIC的超高频振动疲劳试样动态全场应变测量方法  

Ultra-high frequency vibration fatigue dynamic strain field measurement based on digital image correlation method

作　　者：陈新 许巍 何玉怀 CHEN Xin;XU wei;HE Yuhuai(Bejing Key Laboratory of Aeronautical Materials Testing and Evaluation,Key Laboratory of Science Technology on AeronauticalMaterials Testing and Evaluation,AeroEngine Corporation of China,Science and Technology on Advanced High Temperature StructuralMaterials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]航空材料检测与评价北京市重点实验室,中国航空发动机集团材料检测与评价重点实验室,先进高温结构材料国防科技重点实验室,中国航发北京航空材料研究院,北京100095

出　　处：《实验力学》2021年第5期677-685,共9页Journal of Experimental Mechanics

基　　金：国家自然科学基金(91860112);国家科技重大专项(J2019-Ⅵ-0002)。

摘　　要：以某型发动机用TC17钛合金超高频振动疲劳试样为研究对象,针对振动疲劳对应力标定的需求,在超高频振动条件下采用三维数字图像相关(DIC)方法对超高频试样的动态全场应变进行了测量,实际加载频率达到1756Hz。通过三维DIC方法有效获取了超高频振动条件下动态全场应变,确定了试样振动条件下的最大应变位置,以及不同振幅条件下应变幅值随时间的变化曲线,并实现了振动疲劳试验过程的应力标定。本研究同时采用基于电阻应变计的电测法进行了对比验证,测量结果与DIC方法结果的一致性良好。The stereo digital image correlation(DIC)technology was used to measure the dynamic full-field strain field of ultra-high frequency(UHF)specimens based on TC17 titanium alloy.The strain was measured by low-frame-rate stereo-DIC system,and the test frequency reached up to 1756Hz during the measurement.Through the DIC method,the dynamic full-field strain was effectively obtained under UHF vibration conditions,and the maximum strain position under the vibration condition of the testing piece was determined precisely.The strain amplitude variation curve at the maximum strain position under different amplitudes was achieved,and the stress calibration line of vibration fatigue was determined.In this study,the electrical measurement method based on the resistance strain gauge is used for comparison and verification,and the measurement result is very close to that of the present DIC method.

关 键 词：超高频振动 振动疲劳 数字图像相关 钛合金 

分 类 号：O346.4[理学—固体力学]