Nondestructive testing enhancement method of internal defects of composite carbon fiber plate

Abstract

The invention discloses a nondestructive testing enhancement method of internal defects of a composite carbon fiber plate and belongs to the technical field of nondestructive testing of novel materials. By adopting the method, a result obtained after Fourier transform can be further enhanced to make the defects detected after the Fourier transform more obvious, and the defects which are only subjected to the Fourier transform and cannot be detected can be detected after being subjected to enhancement processing. Heat generation of a complete area of a sample to be detected is different to thatof a deficient area of the sample to be detected, but since the difference between the two areas in thermal diffusion heat is too small to detect easily, the difference between the complete area andthe deficient area can be enlarged by conducting thermal diffusion inhibition; since a heating area of an exciting coil is superposed with the deficient area, the two information areas are difficult to separate within a time domain, so that by adopting the Fourier transform, the information is transformed into a frequency domain for processing, and it is shown that a great result is obtained.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of new materials, and more specifically, it is a method for enhancing the non-destructive testing method for internal defects of composite carbon fiber boards. Background technique [0002] With the continuous development and innovation of modern material technology, composite materials are widely used in aerospace and other fields due to their advantages such as high strength, high temperature resistance and oxidation resistance, and can even replace metal materials on some core components. Composite materials can have different physical properties depending on the composition of materials and structures. Currently, the types of structures that have been applied mainly include fiber-reinforced and sandwich structural composite materials. As an advanced composite material with high strength, light weight and strong designability, carbon fiber reinforced plastic laminates are widely...

AI Technical Summary

Problems solved by technology

Due to its complex structure, composite materials will inevitably have defects and damages such as delamination and fracture due to the instability of the process quality or the influence of the use environment during the manufacturing process.

These defects and damages may not be detectable on the surface of the material, but they will seriously affect the bearing capacity of the composite material. For example, delamination damage has a great impact on the strength and stiffness of the composite material laminate, which has become a hidden danger of major engineering accidents.

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