Affiliation of Author(s):机电学院
Journal:Eur. Workshop Struct. Heal. Monit., EWSHM
Abstract:Digital image correlation (DIC) has been developed for decades as a non-contact optical technique of full-field displacement and strain measurement using precise and costly digital cameras with high image resolution and used in many applications, including material characterization, temperature deformation, fracture analysis, vibration analysis and so on. Traditional sensors, like contact or single-point types, are difficult to obtain the accurate and full-field vibration information in thin-wall parts measurement with experimental mechanics method. Simultaneously with the development of high-speed camera technology, vibration modes measurement based DIC is more and more attention, such as a series of beams vibration modes measurement research recently that is fit for the view of high frame rate and decreased resolution. In this paper, a high-speed camera made in NAC Image Technology is used to DIC image acquisition, called MemreCam HX-3. A health plate vibration mode is measured including natural frequencies and mode shapes firstly. Then, a defective plate containing pre-cracking is measured and compared with the healthy one. Results show that 1) the resolution of natural frequencies measurement are less than 1Hz. 2) The relationship between pre-cracking length and second order natural frequency are significant. © 2018 NDT.net. All rights reserved.
Translation or Not:no
Date of Publication:2018-01-01
Co-author:Liang, Zhonghan,Zhao, Minzhe,Liang, Anyang
Correspondence Author:Yue Lin
Date of Publication:2018-01-01