Metal plate micro-defect detection method based on nonlinear Lamb waves

A detection method and non-linear technology, applied in measuring devices, processing detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problem of low accuracy, variable and complex Lamb wave propagation, and lack of unity and other issues to achieve the effect of improving accuracy

Pending Publication Date: 2020-04-21
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

During the propagation of the Lamb wave in the plate, there will be dispersion phenomenon, and multiple modes will be generated. Due to the mutual interference between the wave packets of multiple modes, the reception and signal processing are very complicated.
[0004] When there are defects in the plate, the propagation of ...

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  • Metal plate micro-defect detection method based on nonlinear Lamb waves
  • Metal plate micro-defect detection method based on nonlinear Lamb waves
  • Metal plate micro-defect detection method based on nonlinear Lamb waves

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Embodiment 1

[0057] A metal plate micro-defect detection method based on nonlinear Lamb waves, comprising the following steps:

[0058] S1: Obtain the phase velocity dispersion curve and group velocity dispersion curve of the metal plate;

[0059] S2: According to the phase velocity dispersion curve and the group velocity dispersion curve, the excitation frequency, the Lamb wave of a specific mode and the incident angle of the Lamb wave of a specific mode are obtained as model parameters;

[0060] S3: Deduce the relative nonlinear coefficient β' according to the Lamb wave of a specific mode in S2, and the relative nonlinear coefficient β' is used to characterize the depth of the defect;

[0061] S4: Establish a nonlinear ultrasonic testing system according to the model parameters;

[0062] S5: Test the metal plate according to the nonlinear detection system established in S4 and judge whether the relative nonlinear coefficient β' is reliable, and if reliable, use the relative nonlinear co...

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Abstract

The invention provides a metal plate micro-defect detection method based on nonlinear Lamb waves. The metal plate micro-defect detection method comprises the following steps of: S1, acquiring a phasevelocity frequency dispersion curve and a group velocity frequency dispersion curve of a metal plate; S2, acquiring an excitation frequency, Lamb waves of a specific mode and an incident angle of theLamb waves of the specific mode as model parameters according to the phase velocity frequency dispersion curve and the group velocity frequency dispersion curve; S3, deriving a relative nonlinear coefficient beta' according to the Lamb waves of the specific mode in the S2, wherein the relative nonlinear coefficient beta' is used for representing the depth of a defect; S4, establishing a nonlinearultrasonic test system according to the model parameters; and S5, testing the metal plate according to the nonlinear ultrasonic test system established in the step S4, judging whether the relative nonlinear coefficient beta' is reliable or not, and if so, representing the defects of the tested metal plate by utilizing the relative nonlinear coefficient beta'. According to the metal plate micro-defect detection method, the relative nonlinear coefficient beta' represents the defects of the tested metal plate, the defects of the metal plate can be effectively represented, and the detection precision is improved.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a method for detecting micro-defects in aluminum alloy plates based on nonlinear Lamb waves. Background technique [0002] Compared with traditional ultrasonic technology, the technology of using the propagation characteristics of ultrasonic guided waves in solid media to detect materials and structures is faster, more economical, and more sensitive. It is an important research in the field of non-destructive testing (Non Destructive Testing, NDT) hotspot. [0003] Lamb wave is a commonly used guided wave mode in ultrasonic nondestructive testing. Because of its advantages of small attenuation, long detection distance and fast propagation speed, it is very suitable for defect detection of large-area metal plates. During the propagation of the Lamb wave in the plate, there will be dispersion phenomenon, and multiple modes will be generated. Due to the mutual interference be...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/07G01N29/44G01N29/46
CPCG01N29/041G01N29/07G01N29/4418G01N29/46G01N2291/0289G01N2291/0427
Inventor 陈汉新王琪张光宇柯耀苗育茁黄浪
Owner WUHAN INSTITUTE OF TECHNOLOGY
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