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Method for positioning and detecting crack defects of material

A detection method and defect technology, which is applied in the analysis of materials, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, measuring devices, etc., can solve the problems of increasing the cost of ultrasonic testing technology and the difficulty of operation, and achieve simplified tracking and length calculations , low cost effect

Active Publication Date: 2021-12-21
SOUTHEAST UNIV
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Problems solved by technology

This is very difficult in industrial applications and increases the cost and operational difficulty of ultrasonic testing techniques

Method used

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  • Method for positioning and detecting crack defects of material
  • Method for positioning and detecting crack defects of material
  • Method for positioning and detecting crack defects of material

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Embodiment Construction

[0050] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the accompanying drawings. This embodiment is only used to explain the present invention, and does not constitute a limitation to the protection scope of the present invention.

[0051] A method for locating and detecting material crack defects, comprising the following steps:

[0052] Step 1: According to the geometric shape of the material structure 12 to be detected, determine multiple paths for guided wave propagation, including the primary reflection path 4 and the secondary reflection path 11 with the material boundary 9;

[0053] Step 2: In the material structure 12, the actuator 3 and the sensor 1 are set to transmit and receive guided wave signals;

[0054] Step 3: Use the matching pursuit guided wave decomposition method to determine the time delay of the waveforms of different paths recorded in the received signal;

[0055] S...

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Abstract

The invention discloses a method for positioning and detecting crack defects of a material, which is characterized in that accurate detection of point-shaped and linear defects in the material is realized only by using a pair of transducers according to the material boundary reflection principle of guided waves and obvious difference of reflected waves of the guided waves in different areas of the defects, and the length of the linear defects is accurately estimated. Meanwhile, the invention provides a guided wave decomposition method based on matching pursuit to accurately judge propagation time delays of guided waves of different paths (time delay judgment can be carried out on each guided wave mode), and provides a path compensation method to carry out classification judgment on defect reflection signals of different areas. The method can be applied to industrial facilities, aerospace equipment and the like for ultrasonic nondestructive testing, ultrasonic nondestructive evaluation, structural health monitoring and the like of crack defects.

Description

technical field [0001] The invention relates to the technical field of engineering acoustics, in particular to a method for locating and detecting material crack defects. Background technique [0002] The application of guided wave-based defect detection technology in structural health detection and non-destructive testing has attracted much attention. Guided waves can propagate over long distances, and their sensitivity to defects is critical for defect detection. However, among the numerous guided wave defect detection technologies, they only focus on the detection and location of defects. Accurate assessment techniques for the length of defect topography are lacking. At the same time, in order to achieve precise positioning of defects in materials, a large number of actuators and a network of suitable sensor arrangements are required. This is very difficult in industrial applications and increases the cost and operational difficulty of ultrasonic testing techniques. ...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/265G01N29/44
CPCG01N29/04G01N29/265G01N29/4409G01N2291/023
Inventor 张辉王胜倪中华
Owner SOUTHEAST UNIV
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