Title:
NON-LINEAR LAMB WAVE MIXING METHOD FOR MEASURING DISTRIBUTION OF STRESS IN THIN METAL PLATE
Document Type and Number:
WIPO Patent Application WO/2020/233359
Kind Code:
A1
Abstract:
A stress distribution detection method based on nonlinear Lamb wave mixing technology, which relates to the field of non-destructive testing, and which is suitable for stress distribution detection and the positioning of stress concentration regions in plate structures. The method comprises the following steps: first determining excitation frequencies of two fundamental waves according to a measured object and a nonlinear Lamb wave mixing resonance condition; exciting two lines of A0 modal waves at left and right ends of a test piece in opposite directions, and receiving a sum frequency S0 signal at a certain position between excitation signals to detect the nonlinear mixing stress on a plate structure; by means of changing an excitation time delay of the excitation signals, performing mixing scanning on different positions of the test piece to extract a mixing wave amplitude; and finally, according to a rule of change of the amplitude of a sum frequency difference signal following mixing position, the detection of the distribution of stress on a metal plate and the positioning of a stress concentration region can be achieved.
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Inventors:
JIAO JINGPIN (CN)
CHENG QUAN (CN)
CHENG QUAN (CN)
Application Number:
PCT/CN2020/087352
Publication Date:
November 26, 2020
Filing Date:
April 28, 2020
Export Citation:
Assignee:
UNIV BEIJING TECHNOLOGY (CN)
International Classes:
G01L1/25; G01N29/04
Foreign References:
| CN110108402A | 2019-08-09 | |||
| CN104807888A | 2015-07-29 | |||
| CN107576384A | 2018-01-12 | |||
| CN109060206A | 2018-12-21 | |||
| CN105372330A | 2016-03-02 | |||
| CN104807570A | 2015-07-29 | |||
| US5154081A | 1992-10-13 |
Attorney, Agent or Firm:
BEIJING SIHAI TIANDA INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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