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Lookup NU author(s): Professor Gui Yun TianORCiD
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© 2019, Science Press. All right reserved.Inspection of plastic deformation in structural specimen is one key problem for safe operation and maintenance. In this paper, a contactless ultrasonic testing method using an electromagnetic acoustic transducer in resonant mode is proposed to solve the problem of plastic deformation in Q235 steel. Compared with conventional ultrasonic pulse echo method for plastic deformation inspection, the use of resonant ultrasonic signals and signal processing with power spectrum analysis can significantly enhance signal amplitude of the electromagnetic acoustic resonance (EMAR). The double wave superposition of nth compression and double wave multiplication of nth compression are applied to increase the signal-to-noise ratio and detecting ability of the resonant wave crests. The absolute error of EMAR detection in the standard specimens measurement is smaller than 0.2%, which demonstrates the capability of this plastic deformation in Q235 steel.
Author(s): Cai Z, Chen L, Zhao Z, Tian G
Publication type: Article
Publication status: Published
Journal: Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument
Online publication date: 31/07/2019
Acceptance date: 02/04/2019
ISSN (electronic): 0254-3087
Publisher: Science Press
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