Eddy current probe ring array method for detecting laying direction of carbon fiber composite material

Abstract

The invention discloses an eddy current probe ring array method for detecting the laying direction of a carbon fiber composite material. The method includes: constructing an eddy current probe ring array, selecting an eddy current probe optimum frequency, conducting eddy current probe autobias adjustment, extracting signal feature extraction information and calculating signal amplitude, utilizing polar coordinates to display a normalized signal and determining the directional angle of a laying layer. The carbon fiber composite material laying direction detection method provided by the invention combines probe array method and near resonance frequency work mode to extract probe signal induced voltage, presents the laying direction information of a carbon fiber laminated plate in a polar coordinate form, can accurately and effectively realize judgment of the carbon fiber composite material laminated plate laying, has the characteristics of fast imaging speed, clear and reliable imaging result, visualizability and understandability.

Description

[0001] Technical field: [0002] The invention relates to the technical field of non-destructive testing of carbon fiber composite materials, in particular to an eddy current probe ring array method for detecting the layering direction of carbon fiber composite materials. [0003] Background technique: [0004] The excellent mechanical properties of carbon fiber composite materials, especially the characteristics of high specific strength, high specific stiffness, strong designability, corrosion resistance and good fatigue resistance, make it become more and more popular in automobile manufacturing and aerospace. one of the materials. Carbon fiber composite materials are made of multi-layer carbon fiber / epoxy resin sheets stacked together in a certain direction, and the fibers in each layer are arranged in the same direction. In practical applications, in order to improve the anisotropy and increase the overall mechanical strength of the composite material, the fiber direction...

AI Technical Summary

Problems solved by technology

[0005] At present, the method for detecting the directionality of fiber arrangement is mainly the rotating eddy current probe method, which achieves the purpose of detection through the rotation of the probe, so there are certain defects and limitations:

However, in actual detection, the distance between the probe and the test piece will inevitably change, which will introduce measurement errors and have a great impact on the detection sensitivity

[0008] (3) In actual field applications, especially for those devices that need to quickly and accurately detect the direction of carbon fiber arrangement, it will undoubtedly increase the error rate of detection time and results

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