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

Abstract

The invention discloses a method for analyzing the surface texture of a carbon fiber composite material based on Gabor conversion of a frequency spectrum method. The method comprises the following steps: carrying out Butterworth filtering pretreatment on a surface image of an original carbon fiber material; carrying out Gabor conversion on the pretreated image, so as to obtain a filtered image Gabout; converting the filtered image into a frequency domain; and carrying out normalization processing on a matrix to obtain a grey level histogram of the matrix, and calculating entropy value characteristics of the image by virtue of the grey level histogram. According to the method, the entropy value characteristics of the carbon fiber composite material can be extracted at different scales and directions in the frequency domain, and the entropy value of the carbon fiber composite material extracted by a Gabor function can be taken as variation basis of mean square root height Sq values, andbesides, relatively fine texture information among approximate Sq values can be further extracted, so that the mean square root height Sq values measured by virtue of a machine can be objectively assisted.

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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