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Fiberglass bending stress damage map quantitative evaluation method based on empirical mode decomposition

An empirical mode decomposition and quantitative evaluation technology, which is applied in the field of acoustic emission non-destructive testing, can solve problems such as the inability to detect FRP in service and the inability to assess the health status, and achieve the effect of a simple sound wave propagation path

Active Publication Date: 2019-06-07
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

These commonly used methods have their own areas of expertise but have certain limitations.
The common limitation is that it is impossible to conduct real-time in-service detection of FRP, and it is impossible to evaluate the real-time health status of the material

Method used

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  • Fiberglass bending stress damage map quantitative evaluation method based on empirical mode decomposition
  • Fiberglass bending stress damage map quantitative evaluation method based on empirical mode decomposition
  • Fiberglass bending stress damage map quantitative evaluation method based on empirical mode decomposition

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Embodiment Construction

[0031] In the experiment, the acoustic emission detector was used to monitor the mechanical behavior of the FRP test block under the bending load in real time, and the damage phenomenon of the FRP under the bending load and the internal relationship with the characteristics of the acoustic emission signal were found, and based on this, The damage of FRP is quantitatively evaluated, and the specific implementation method is as follows:

[0032] The FRP test block is prepared, the test block matrix is ​​made of 430 resin, and the woven glass fiber cloth is used as the reinforcing fiber. The design and manufacture of the test block refer to "GB / T1446-2005 General Rules for Test Methods of Fiber Reinforced Plastics". The test piece is a [0° / 90°] laminate with a thickness of 11mm. The specific dimensions are shown in Figure 1, where L is the length of the test block, b is the width of the test block, and h is the thickness of the test block. Referring to the national standard siz...

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Abstract

The invention discloses a fiberglass bending stress damage map quantitative evaluation method based on empirical mode decomposition. An empirical mode decomposition method is used for processing acoustic emission detection signals, and processed natural mode component energy spectra are applied to quantitatively evaluate different damage stages of materials. The fiberglass bending stress damage map quantitative evaluation method based on the empirical mode decomposition comprises the steps that firstly, according to a bending loading displacement curve, the acoustic emission signals produced in the bending loading damage process of fiberglass at different stages are extracted through a bending mechanical loading test; then the EMD process is separately carried out, the decomposed natural mode component energy spectra are calculated, the characteristics of the acoustic emission signal spectra in different stages are analyzed, and the corresponding relationship between the acoustic emission signal spectra is established; and finally, the damage stage of the fiberglass is analyzed and evaluated quantitatively according to the damage to the fiberglass by the spectra, so that the purpose of quantitative evaluation and damage early warning of the fiberglass of the fiberglass full service life is realized. The fiberglass bending stress damage map quantitative evaluation method is further suitable for health monitoring of other reinforced fiber composites, and has an important practical application value.

Description

technical field [0001] The invention belongs to the field of acoustic emission non-destructive testing, in particular to a method for quantitatively evaluating FRP flexural stress damage spectrum based on empirical mode decomposition. Background technique [0002] FRP is made of glass fiber material and synthetic resin material through a certain process to make the material that people need. Compared with a single material, the mechanical properties of the material are optimized. Glass fiber materials have been highly valued in recent decades and are widely used because of their good performance characteristics, especially in aerospace, shipbuilding and other fields. The texture of FRP is lighter, and its density is much lower than that of ordinary carbon steel, only 20%-25% of carbon steel. It is light in texture, which is convenient for installation and transportation. It has high mechanical strength, bending resistance and tensile strength. It can reach or even exceed so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14
Inventor 李秋锋李昕齐添添黄丽霞龙盛蓉卢超陈尧
Owner NANCHANG HANGKONG UNIVERSITY
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