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A Method for Monitoring Damage Evolution Process of Brittle Materials Using Signal Spectrum Coefficients

A technology for brittle materials and damage evolution, which is applied in the direction of material analysis using acoustic wave emission technology, material analysis using sound waves/ultrasonic waves/infrasonic waves, and material analysis, and can solve problems such as material degradation, damage failure, etc.

Active Publication Date: 2021-03-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The initiation, propagation and coalescence of microcracks will lead to the gradual deterioration of the material until the final destructive failure

Method used

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  • A Method for Monitoring Damage Evolution Process of Brittle Materials Using Signal Spectrum Coefficients
  • A Method for Monitoring Damage Evolution Process of Brittle Materials Using Signal Spectrum Coefficients
  • A Method for Monitoring Damage Evolution Process of Brittle Materials Using Signal Spectrum Coefficients

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Experimental program
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Embodiment 1

[0037] In this embodiment, the brittle material to be monitored is concrete, and a three-point bending failure test is performed on the concrete.

[0038] Using the method proposed by the present invention to monitor the damage evolution process of brittle materials using signal energy spectrum coefficients to monitor the concrete damage evolution process, the specific operation steps are:

[0039] Step 1. Arranging an acoustic emission sensor on the brittle material to be monitored for real-time collection of acoustic emission signals on the brittle material to be monitored.

[0040] Step 2. According to the waveform characteristics of the acoustic emission signal collected in step 1, select the db3 wavelet basis, and the db3 wavelet basis function diagram is as follows figure 1 shown.

[0041] Step 3. Use the wavelet base selected in step 2 to decompose the acoustic emission signal collected in step 1 into 2-level wavelet packet decomposition, and the acoustic emission sign...

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Abstract

The invention relates to a method for monitoring the damage evolution process of brittle materials by using signal energy spectrum coefficients, and belongs to the technical field of material damage detection. The steps are: ①Arrange acoustic emission sensors on the brittle material to be monitored to collect acoustic emission signals; ②Select wavelet bases according to the waveform characteristics of acoustic emission signals; ③Decompose the acoustic emission signals into AA 2 ,DA 2 , AD 2 and DD 2 4 frequency band signals; ④ Calculate AA 2 The spectral coefficient P of the frequency band signal 1 ; ⑤ Take 20 acoustic emission signals as sliding windows, select 20 acoustic emission signals as a window according to the acquisition sequence, and calculate P in each window 1 mean, and plot P 1 Distribution diagram with the number of windows; ⑥According to P 1 The change state of the brittle material to be monitored is monitored for the damage evolution process. The method proposed by the invention can quantitatively obtain the physical information of the internal mesostructure change of the material, and monitor the damage evolution process of the brittle material in real time.

Description

technical field [0001] The invention relates to a method for monitoring the damage evolution process of brittle materials by using signal energy spectrum coefficients, and belongs to the technical field of material damage detection. Background technique [0002] There are often a large number of diffuse initial microcracks in brittle materials, and microcrack damage is a prominent feature of brittle material failure. The initiation, propagation and coalescence of microcracks will lead to the gradual deterioration of the material until the final destructive failure. The deformation and destruction of materials is an irreversible process of energy dissipation, and energy changes run through the entire process of material deformation and destruction. When a crack is initiated and propagated in a brittle material, a local source rapidly releases energy to generate a transient elastic wave, which is the phenomenon of acoustic emission. Acoustic emission is also called stress wav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/14G01N29/44G01N29/46
CPCG01N29/14G01N29/4409G01N29/46G01N2291/023G01N2291/0289
Inventor 宁建国任会兰王宗炼马天宝李健
Owner BEIJING INSTITUTE OF TECHNOLOGYGY