Crack damage monitoring and strain field measuring method based on FBG (Fiber Bragg Grating) sensor array spectrum

A sensor array, damage monitoring technology, applied in measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problems of not being able to obtain damage information and not involving the measurement of the stress field at the crack tip.

Inactive Publication Date: 2018-09-21
WUHAN UNIV OF TECH
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Problems solved by technology

[0003] In the relevant literature and experiments, it is found that the crack position and expansion of the aluminum alloy crack damage are currently based on the wavelength drift of the FBG sensor, but when the strain field cause

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  • Crack damage monitoring and strain field measuring method based on FBG (Fiber Bragg Grating) sensor array spectrum
  • Crack damage monitoring and strain field measuring method based on FBG (Fiber Bragg Grating) sensor array spectrum
  • Crack damage monitoring and strain field measuring method based on FBG (Fiber Bragg Grating) sensor array spectrum

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Embodiment Construction

[0029] A preferred embodiment of a crack damage monitoring and strain field measurement method based on the FBG sensor array spectrum of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] The crack damage monitoring and strain field measurement method based on the FBG sensor array spectrum of the present invention can be tested in the laboratory now, and the specific steps are as follows:

[0031] Step 1: Select the sample and design the sample, select the non-destructive sample and the damaged sample, and the damaged sample is a crack with a certain length in the central area of ​​one side of the test piece;

[0032] Step 2: Carry out structural mechanics analysis on the specimen. Perform finite element simulation analysis on the damaged test piece to determine the stress and strain distribution at the crack tip: before the finite element analysis, it is necessary to determine the external loading conditions, test p...

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Abstract

The invention discloses a crack damage monitoring and strain field measuring method based on an FBG (Fiber Bragg Grating) sensor array spectrum. The method comprises the following steps: 1, selectinga test specimen to be measured; 2, performing structural mechanics analysis on the test specimen to be measured; 3, sticking a sensor to the test specimen; 4, performing a loading experiment on the test specimen stuck with the FBG sensor to determine an experimental system; 5, performing analysis on a series of obtained spectra to explore the corresponding relation between the characteristic parameters of the spectra and the initial positions of cracks as well as the extension conditions of the cracks; and 6, comparing the stress strain and the distance curve obtained by the FBG sensor with finite element simulation results. By virtue of the steps, crack damage monitoring and crack tip stress field measurement are realized, the corresponding relation between crack damages and spectra is achieved, and the feasibility of the method for measuring the crack tip strain field can be verified through experiments.

Description

technical field [0001] The invention relates to the field of structural health monitoring, in particular to a method for crack damage monitoring and strain field measurement based on FBG sensor array spectrum. Background technique [0002] In recent years, with the rapid development of industry, large-scale equipment and structures, increased design stress levels, and high-strength aluminum alloys have been put into use, many vicious fracture accidents have occurred one after another. After various studies, it is believed that these fractures all originate from the poor toughness and low hardness of aluminum, and the material is prone to cracks. However, the traditional design thought that the material is a continuous, uniform and isotropic medium, and has never considered the defects in the material. Obviously, this is inconsistent with the actual engineering. In order to ensure the safety of the structure and prevent the occurrence of fracture accidents, people began to ...

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Application Information

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IPC IPC(8): G01N3/08G01N3/06
CPCG01N3/08G01N3/068G01N2203/0017G01N2203/0066G01N2203/0075G01N2203/0216G01N2203/0641G01N2203/0676G01N2203/0682
Inventor 文晓艳郑漫琳
Owner WUHAN UNIV OF TECH
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