Ultrasonic guided wave defect quantitative detection method and application thereof

A quantitative detection method and ultrasonic guided wave technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of inability to determine the length of defects such as debonding, inability to determine the shape of defects, etc., achieving high precision and strong detection accuracy. Effect

Pending Publication Date: 2022-07-12
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these detection methods and other non-destructive testing on defects can only simply determine the position of the defect, but cannot determine the shape of the defect, especially the length of defects such as debonding.

Method used

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  • Ultrasonic guided wave defect quantitative detection method and application thereof
  • Ultrasonic guided wave defect quantitative detection method and application thereof
  • Ultrasonic guided wave defect quantitative detection method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0099] The simulation experiment is carried out by the above-mentioned embodiment:

[0100] The detection target is an anchor rod with a total length of 3m and a diameter of 2cm. The length of the anchor is 2.5m. There is a debonding defect in the middle, and the length of the defect is 0.6m.

[0101] The return signal which is generated according to the above-mentioned embodiment is as follows figure 2 shown.

[0102] After ICEEMDAN decomposition, the 10th-order IMF is obtained, such as image 3 shown.

[0103] In order to obtain the wave speed of the ultrasonic guided wave in the steel bar and the anchored compact section, the ultrasonic guided wave detection is carried out for the free anchor with a length of 3m (that is, the anchor without the anchoring section) and the full-length anchored compact anchor according to the process of step S1. Obtain the envelope of the reflected signal, such as Figure 4 , Figure 5 shown.

[0104] Figure 4 It is the reflection wav...

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Abstract

The invention discloses an ultrasonic guided wave defect quantitative detection method and application thereof. The defect quantitative detection method comprises the following steps: acquiring the propagation velocity of ultrasonic guided waves in a free section, without an anchor, of an anchor rod through ultrasonic guided wave detection; the propagation speed of ultrasonic guided waves in the anchoring dense section of the anchor rod is obtained through ultrasonic guided wave detection; and processing a return signal obtained by ultrasonic guided wave detection through an ICEEMDAN method, obtaining reflection time parameters of different positions and defect positions of the anchor rod according to a peak value of an intrinsic mode function obtained after signal decomposition, and quantitatively detecting the length of the defect according to the propagation velocity and the reflection time parameters. The detection method is efficient, accurate and suitable for wide application.

Description

technical field [0001] The invention relates to the technical field of ultrasonic guided waves for quality detection. Background technique [0002] Anchor rod is a reinforcement and support tool widely used in the construction of surface engineering such as slopes, deep geotechnical foundation pits, and underground engineering such as tunnels and stopes. For the part where the force is transmitted, in general, the longer the anchoring section in the bolt is, the better the reinforcement and support effect will be. [0003] In engineering applications, the quality of the bolt is directly related to the safety of the project. Once the failure of the bolt occurs, it will pose a huge threat to the stability of the geotechnical structure, which may result in serious on-site accidents and huge losses of the project. . There are usually many reasons for the failure of the bolt, such as: insufficient length of the anchoring section of the bolt; failure of the anchoring agent to ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
CPCG01N29/07G01N2291/023
Inventor 刘磊磊韩函朱骏张绍和王李昌朱文卿
Owner CENT SOUTH UNIV
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