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High-pressure-gas-coupled ultrasonic detection method for flaw of composite material

A composite material and high-pressure gas technology, which is applied to the analysis of materials, the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, and the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, etc. It can solve contamination, detection is not fully applicable, and time-consuming coupling agent cleaning And other issues

Inactive Publication Date: 2012-07-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

This traditional method is not completely applicable to the detection of composite material specimens, the main reason is that water will make the specimen damp or dirty, and may penetrate into the damaged part, which will seriously affect the mechanical strength and dimensional stability of the component; secondly, The water-coupled ultrasonic testing method is also not suitable for regular routine inspection and maintenance of machines in service; thirdly, when other liquid acoustic coupling media are used, the cleaning of the couplant after testing is also time-consuming

Method used

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  • High-pressure-gas-coupled ultrasonic detection method for flaw of composite material
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  • High-pressure-gas-coupled ultrasonic detection method for flaw of composite material

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Embodiment Construction

[0028] The specific implementation steps of the present invention are described in detail below:

[0029] 1) Determine the relevant parameters of the composite material workpiece to be tested, including the thickness T of the test piece, the sound velocity C, etc., to ensure that the ultrasonic wave can penetrate the test piece under a certain excitation voltage and gain.

[0030] 2) Determine the selected transmitting and receiving air-coupled ultrasonic probes, both of which have a nominal frequency of 500KHz, a near-field distance of 60mm, and an aperture of 20mm.

[0031] 3) Place the test piece between the transmitting and receiving transducers, adjust the horizontal position of the probes to keep the axes of the two probes consistent, and adjust the distance to maximize the amplitude of the received A-scan waveform.

[0032] 4) Place the air-coupled ultrasonic transducer and the test piece in a closed pressurized chamber, observe the received A-scan waveform under standa...

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Abstract

The invention discloses a high-pressure-gas-coupled ultrasonic detection method for a flaw of a composite material. The high-pressure-gas-coupled ultrasonic detection method for the flaw of the composite material is mainly characterized in that: the attenuation degree in ultrasonic propagation is lowered through changing the pressure intensity of a detection environment (increasing the density of coupled gas in the detection environment) so as to improve the accuracy and the sensitivity in flaw detection. The method has the characteristics of no contact, no penetration and complete no destruction, is flexible and convenient to use, can realize quick online scanning, and has very good application prospects.

Description

1. Technical field [0001] The invention relates to a high-pressure gas coupling ultrasonic detection method for defects in composite materials, which belongs to the field of non-destructive testing. 2. Background technology [0002] Composite materials have the characteristics of light weight, high strength, convenient processing and molding, excellent elasticity, and chemical corrosion resistance. They have gradually replaced wood and metal alloys, and are widely used in aerospace, automobiles, electronics, construction and other fields. developed rapidly. However, due to the heterogeneity and anisotropy of composite materials, the process is unstable in the manufacturing process and defects are prone to occur; in the application process, composite materials are also prone to defects due to physical and chemical factors such as fatigue accumulation, impact, and corrosion. Defects, and a large part of these defects are generated inside the composite material, which is not e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/11G01N29/28
Inventor 徐春广王洪博徐尧肖定国赵新玉郝娟周世圆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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