A new imaging detection method suitable for detecting early fatigue damage of materials

A technology for fatigue damage and detection of materials, which is applied in the direction of analyzing materials, using sound waves/ultrasonic waves/infrasonic waves for material analysis, and processing detection response signals. It can solve the problems of low detection sensitivity, improve sensitivity, and solve the remaining life of equipment. Estimation problem, effect of convenient health evaluation

Active Publication Date: 2022-07-01
TIANJIN UNIV
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Problems solved by technology

[0009] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a new imaging detection method suitable for detecting early fatigue damage of materials, provides a method for accurately stimulating nonlinear harmonics with amplitude cumulative growth effect, and combines nonlinear ultrasonic guided wave Technology and tomographic imaging technology are used to solve the technical problem of low detection sensitivity of the existing ultrasonic guided wave technology for the detection of subtle early defects such as early fatigue damage of materials

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  • A new imaging detection method suitable for detecting early fatigue damage of materials
  • A new imaging detection method suitable for detecting early fatigue damage of materials
  • A new imaging detection method suitable for detecting early fatigue damage of materials

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Embodiment Construction

[0080] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0081] like figure 1 As shown, the embodiment of the present invention provides a new imaging detection method suitable for detecting early fatigue damage of materials, and the specific steps are as follows:

[0082] Step 1: Set up two sets of detection models, one of which does not contain early fatigue damage, the other contains early fatigue damage, and other material parameters and geometric dimensions are exactly the same. Defin...

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Abstract

The invention proposes a new imaging detection method suitable for detecting early fatigue damage of materials. Wave type and nonlinear harmonic type, draw the phase velocity dispersion curve of the main mode and harmonics, select the mode and frequency of the main mode guided wave according to the phase matching and non-zero energy current coupling conditions, and use the sensor array to detect the wave. The material is detected and the vibration displacement signal is obtained; finally, the vibration displacement signal is integrated by band-pass filtering and short-time Fourier transform through tomography technology, and the probability distribution of the early fatigue damage of the material is calculated, and the detection is completed. Detection of early fatigue damage in materials. The invention combines the nonlinear ultrasonic guided wave technology with the tomography technology, realizes the visualization and imaging of early damage detection, and improves the sensitivity, accuracy and rapidity of material degradation detection.

Description

technical field [0001] The invention relates to the field of non-destructive testing technology and structural health testing, in particular to a new imaging testing method combining nonlinear ultrasonic guided wave technology and tomography technology suitable for detecting early fatigue damage of materials. Background technique [0002] The service equipment in the fields of nuclear power, hydrogen energy storage and transportation, petrochemical and other fields has been working in severe working conditions such as high temperature, high pressure, heavy load, and corrosion for a long time. Representative early microscopic damage. Accurate characterization and prediction of early material damage of service components before macroscopic damage occurs can effectively avoid catastrophic damage and loss of life and property caused by sudden structural failure. [0003] Ultrasonic guided waves are the cutting-edge technology in the field of non-destructive testing and structur...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/06G01N29/44
CPCG01N29/041G01N29/0672G01N29/069G01N29/44
Inventor 李健赵成威刘洋
Owner TIANJIN UNIV
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