Non-linear Lamb wave mixing method for measuring stress distribution in thin metal plates

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United States of America Patent

PATENT NO 11366082
APP PUB NO 20220049996A1
SERIAL NO

17516520

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The invention discloses a non-linear Lamb wave mixing method for measuring stress distribution in thin metal plates. The method is suitable for stress distribution detection and stress concentration area positioning in a plate structure and belongs to the field of nondestructive detection. The steps of the present invention is: first determines the excitation frequencies of two fundamental waves according to the measured object and the nonlinear Lamb wave mixing resonance conditions; the left and right ends of the test piece are oppositely excited two rows of A0 mode waves, and the excitation signal receive the sum-frequency S0 signal at a certain position to detect non-linear mixing stress of the plate structure; by changing the excitation time delay of the excitation signal, perform mixing scan on different positions of the test piece to extract the mixing wave amplitude; finally, according to the variation of amplitude of sum frequency difference signal with mixing position to realize the detection of stress distribution of metal plate and the positioning of the stress concentration area.

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Patent Owner(s)

  • BEIJING UNIVERSITY OF TECHNOLOGY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cheng, Quan Beijing, CN 11 37
Gao, Xiang Beijing, CN 261 2227
He, Cunfu Beijing, CN 4 5
Jiao, Jingpin Beijing, CN 3 5
Li, Li Beijing, CN 1354 17281
Wu, Bin Beijing, CN 243 4015

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