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Strain impulse response covariance damage identification method based on DIC (Digital Image Correlation) technology

A technology of impulse response and damage identification, which is applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of low measurement accuracy, low measurement efficiency, and inconvenient actual operation of measurement personnel, so as to improve the recognition accuracy, The effect of speeding up the recognition speed

Inactive Publication Date: 2018-12-21
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0003] The present invention aims to overcome the technical defects of complex operation, low measurement efficiency, low measurement accuracy and inconvenient actual operation by measuring personnel in the existing resistance strain measurement technology when measuring the stress state with a large stress gradient on the surface of complex components, and provides a DIC technology-based damage identification method of strain impulse response covariance

Method used

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  • Strain impulse response covariance damage identification method based on DIC (Digital Image Correlation) technology
  • Strain impulse response covariance damage identification method based on DIC (Digital Image Correlation) technology
  • Strain impulse response covariance damage identification method based on DIC (Digital Image Correlation) technology

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Embodiment 1

[0036] Such as figure 1 As shown, the strain impulse response covariance damage identification method based on DIC technology includes the following steps:

[0037] S1: Construct the experimental system of the analysis object, divide the component to be tested into multiple units, give the system excitation and obtain multiple images of the deformation process before and after the structure damage;

[0038] S2: Use the MATLAB program to process the image to obtain the displacement field of the surface of the component to be tested, and then use cubic polynomial fitting to obtain the rotation angle at both ends of the unit;

[0039] S3: Calculate the unit strain response, and obtain the strain unit impulse response function through Fourier transform;

[0040] S4: Obtain the unit strain unit impulse response covariance according to the strain unit impulse response function;

[0041] S5: Judging the change value of the covariance of the unit impulse response of the unit strain,...

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Abstract

The invention provides a strain impulse response covariance damage identification method based on DIC technology. The method comprises the following steps: constructing an analysis object experiment system, and acquiring a plurality of deformation process images before and after structural damages; processing the images, acquiring the displacement field of a to-be-measured surface of a component,and obtaining corners of the two ends of the unit through cubic polynomial fitting; calculating a unit strain response to obtain a strain unit impulse response function, thereby obtaining a unit strain unit impulse response covariance; and judging the variation value of the unit strain unit impulse response covariance to complete the damage condition identification of the component. According to the strain impulse response covariance damage identification method based on DIC technology, the DIC technology and the strain impulse response covariance identification method are combined, so that full field strain response information of the structure can be obtained, the identification speed is accelerated, and the identification precision is improved when the method is applied to an actual engineering.

Description

technical field [0001] The invention relates to the fields of digital image tracking and structural damage detection, and more specifically, relates to a strain impulse response covariance damage recognition method based on DIC technology. Background technique [0002] The traditional resistance strain measurement technology, that is, the electric measurement method, is a single-point strain measurement technology. When this technology measures the stress state with a large stress gradient on the surface of complex components, it is necessary to analyze the position of the measurement point in advance and accurately paste the strain rosette. , which makes the entire measurement process more complicated, the measurement efficiency is low, and the measurement accuracy is not high, which brings great inconvenience to the measurement personnel in practical applications. Contents of the invention [0003] In order to overcome the technical defects of the existing resistance str...

Claims

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Application Information

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IPC IPC(8): G01N21/88
CPCG01N21/8851G01N2021/8887
Inventor 陈贡发林金燕罗丽燕梁鹏
Owner GUANGDONG UNIV OF TECH
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