Carbon fiber reinforced polymer (CFRP) machined surface appearance representation method

Abstract

The invention provides a carbon fiber reinforced polymer (CFRP) machined surface appearance representation method. The method includes the steps that a to-be-represented workpiece is a continuous curve block on a bounded domain, and a surface appearance characteristic function F(x,y) is measured; wavelet component division is carried out on the appearance characteristic function F(x,y) of the three-dimensional surface of the bounded domain, and representation of the surface appearance is further carried out. The method is based on a wavelet assessment reference, machined surface appearance of the CFRP is truly reflected, and meanwhile the machined surface appearance which is precisely represented is obtained by calculating representation parameters. According to a wavelet theory, a multi-fractal spectrum of the machined surface of the CFRP is calculated by means of a wavelet transform method, and multi-fractal parameters are identified to represent characteristics of the machined surface appearance of the CFRP. An appearance representation model is built on the basis of multi-fractal characteristic analysis of the machined surface of the CFRP, the characteristics of the whole machined surface can be described, and local appearance characteristics can be described.

Description

technical field [0001] The invention relates to a method for characterization of the surface morphology of carbon fiber composite material cutting. Background technique [0002] Carbon Fiber Reinforced Polymer (CFRP, Carbon Fiber Reinforced Polymer) is a high-tech new material with excellent mechanical properties. It has the advantages of light weight, high strength, high specific modulus, low thermal expansion coefficient, excellent heat resistance and wear resistance. It is widely used in the fields of aerospace, transportation, sports equipment, civil engineering and other industrial special materials. Compared with the processing mechanism of ordinary metal materials, its material characteristics are anisotropy. Moreover, there are many defects on the surface of CFRP machining, and these defects are not all cut directly by the cutting edge, and the cutting surface will produce many special shapes. [0003] At present, the surface morphology characterization technology ...

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Problems solved by technology

[0003] At present, the surface morphology characterization technology of carbon fiber composite materials still adopts or borrows the characterization standards and evaluation models of the surface quality of metal workpieces based on the assumption of isotropy, so that even if very advanced surface roughness measuring instruments are used, and the use of metal materials The surface quality characterization parameters established by the surface characteristics of the workpiece are used to establish the CFRP surface topography evaluation model, and the conclusions drawn still have a large error with the actual situation.

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