A method for surface texture analysis of carbon fiber composite materials based on gabor transform based on spectrum method

Abstract

The invention discloses a Gabor transform-based method for analyzing the surface texture of carbon fiber composite materials based on the spectrum method. First, perform Butterworth filtering preprocessing on the surface image of the original carbon fiber material; secondly, use Gabor transformation on the preprocessed image to obtain the filtered image Gabout; then, transform the filtered image into the frequency domain; finally, perform the matrix After normalization, find the grayscale histogram of the matrix, and calculate the feature entropy value of the image on the histogram. The present invention can not only extract the entropy value characteristics of carbon fiber composite materials at different scales and directions in the frequency domain, but also the entropy value of carbon fiber composite materials extracted by the Gabor function can be used as the basis for the change of the root mean square height Sq. In addition, it can also extract The more detailed texture information between similar Sq values ​​objectively assists the root mean square height Sq value measured by the machine.

Description

technical field [0001] The invention relates to the surface texture analysis of carbon fiber composite materials, in particular to a method for analyzing the surface texture of carbon fiber composite materials based on the Gabor transformation of the frequency spectrum method Background technique [0002] Due to the increased performance difference between the two materials composed of carbon fiber composite materials, when machining them, it is necessary to take into account the comprehensive special factors such as fiber fracture and resin melting coating that occur during the processing of the two materials. At the same time, in the process of processing, various processing problems will also appear. The appearance of gaps between fibers, fiber pull-out, delamination and other special morphology depends to a large extent on the arrangement direction of fibers, resulting in complex surface microstructure. [0003] The evaluation of the surface morphology of carbon fiber c...

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Problems solved by technology

At present, the problem still exists is that in the process of three-dimensional evaluation and measurement of the surface roughness of composite materials, there are many parameters for three-dimensional evaluation, and the parameter selection of the measuring instrument has a great influence on the three-dimensional measurement of surface roughness. Select the method suitable for evaluating the surface roughness of CFRP processing

The root mean square height Sq value is measured by the machine, but if it is necessary to study the texture of the surface of the carbon fiber composite material with a very similar root mean square height Sq value, the value measured by the machine has certain limitations

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