An Eddy Current Mesostructure Imaging Method for Carbon Fiber Composite Materials
A composite material and imaging method technology, applied in the direction of analyzing materials, material magnetic variables, and material analysis through electromagnetic means, can solve the problems of slow response speed, complex structure, and low sensitivity of infrared thermal instruments, and achieve intuitive and easy-to-understand results , clear image, fast imaging effect
Active Publication Date: 2018-11-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
However, at room temperature, the infrared thermal instrument has a slow response and low sensitivity; especially, a refrigeration device is required at a low temperature environment, which has a complex structure and is expensive
[0007] 4) The detection efficiency of computer tomography is low, the cost is high, and the double-sided transmission imaging is not suitable for on-site detection of flat thin plate components and large components
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[0047] specific implementation plan
[0048] The solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are carried out on the premise of the technical solution of the present invention, and specific implementation schemes and operation processes are provided, but the protection scope of the present invention is not limited to the following examples.
[0049] figure 1 Shown is the scanning path of the eddy current probe in the method of this embodiment, and the purpose of scanning a region to be measured by the probe is achieved by controlling the movement in the X-Y direction by the controller of the X-Y two-dimensional displacement platform. The motion law of the plane C-scan probe is: ① move a certain distance each time in the X direction according to the step size set by the program; ② return to the starting position after reaching the specified stroke in the X direction; The step length r...
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The invention discloses an eddy current mesostructure imaging method of a carbon fiber composite material, which adopts a transmit-receive type eddy current probe to obtain structural information of a carbon fiber composite material through C-scanning, and utilizes a subsequent signal processing process to finally obtain Combining the two-dimensional Fourier transform method to present the structure and defect information of the carbon fiber composite material in the form of an image, which includes determining the C-scan path of the eddy current probe and obtaining the real and imaginary parts of the eddy current signal at different positions in the carbon fiber composite material structure , denoising analysis, extracting the characteristic parameters of the detection signal amplitude waveform, determining the damage area and position. The method of the invention can accurately and effectively realize the judgment of the structure and defects of the carbon fiber composite material, has fast imaging speed, clear and reliable images, and intuitive and easy-to-understand results. It provides a reliable imaging solution for grasping the microstructure information and tiny defect information inside the composite material, including the arrangement information of fibers, resins and other components.
Description
technical field [0001] The invention relates to a method for monitoring the internal structure and defects of a carbon fiber composite material, in particular to an eddy current-based imaging method for the mesoscopic structure of a carbon fiber composite material. Background technique [0002] 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. Its mesoscopic structure is a complex multiphase system, and it is heterogeneous and heterogeneous. Different from the macroscopic defects in metal parts, it is easy to produce some defects such as poor glue, rich glue, fiber, etc. during manufacturing and use. Defects such as beam extraction, excessive gaps, misalignment, impact, and delamination can seriousl...
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IPC IPC(8): G01N27/90G01N27/9013
Inventor 裘进浩程军季宏丽徐笑娟吴义鹏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS