Detection method for de-binding of metal matrix composite

Abstract

The invention discloses a detection method for de-binding of a metal matrix composite. The method comprises the following steps: 1) placing an electromagnetic acoustic transducer onto the metal matrix surface of a metal matrix composite; 2) calculating excitation frequency f of an exciting source according to the thickness of the metal matrix in the metal matrix composite on the basis of the formula (1) and the formula (2) and meanwhile setting the exciting time exceeding at least one echo time; 3) inputting the exciting source to the electromagnetic acoustic transducer, generating ultrasonic wave in the metal matrix, propagating the ultrasonic wave to the binding surface and then reflecting, upward propagating the reflected ultrasonic wave to the electromagnetic acoustic transducer, forming an echo signal in the electromagnetic acoustic transducer, feeding the echo signal back to a computer, generating an image and a data and analyzing the binding degree. The detection method has the advantages that no coupling agent is required, no shape requirement for the detected metal composite exists and the detection can be performed under a field environment.

Description

technical field [0001] The invention relates to a detection method, in particular to a metal matrix composite material debonding detection method. Background technique [0002] Metal matrix composites are commonly used materials in the aerospace field, and are also commonly used in thermal insulation layers in the civilian field. Its structure is as figure 1 shown. One or more layers of materials (such as other metals, rubber, ceramics) are bonded on the lower surface of the metal substrate (such as steel). The process requires that no debonding between the bonding layers is allowed, otherwise it will seriously affect the overall metal composite material. performance. [0003] There have been X-ray, infrared thermal imaging, laser holography, ultrasonic guided wave and other technologies for the detection of this material before, but there are various shortcomings in the detection of debonding damage. [0004] X-ray transmission radiography technology is to use X-rays to...

AI Technical Summary

Problems solved by technology

The selectivity to the guided wave mode and frequency is high. If it is the traditional piezoelectric ultrasonic method, the coupling agent is required, which has high requirements on the surface of the metal composite material and cannot adapt to complex curved surfaces. Moreover, the traditional piezoelectric ultrasonic method is difficult to produce rich ultrasonic guided wave mode

In addition, due to the influence of frequency and wavelength, the detection resolution of this method is low

[0008] Moreover, when the above method is used for other types of metals as the bonding material, the detection effect is usually not achieved.

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