Detection method of detecting Young modulus of anisotropic material surface layer based on surface acoustic wave

A surface acoustic wave and anisotropy technology, applied in measurement devices, material analysis, material analysis by optical means, etc., can solve problems such as affecting test results, physical and chemical properties are easily affected by temperature, etc., to simplify measurement steps , Improve the test efficiency, improve the effect of the detection level

Inactive Publication Date: 2015-09-09
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

The traditional ultrasonic testing technology needs to use an ultrasonic couplant. The role of the couplant is to remove the air between the probe and the test piece, so that the ultrasonic wave can penetrate into the test piece to complete the damage detection. The use of the ultrasonic couplant improves the traditional ultrasonic The sensitivity and reliability of detection, but because the physical and chemical properties of most couplants are easily affected by temperature, as the temperature in the detection environment increases, the characteristics of the couplant will change, which will eventually affect the actual detection results

Method used

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  • Detection method of detecting Young modulus of anisotropic material surface layer based on surface acoustic wave
  • Detection method of detecting Young modulus of anisotropic material surface layer based on surface acoustic wave
  • Detection method of detecting Young modulus of anisotropic material surface layer based on surface acoustic wave

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Embodiment 1

[0036] 101: The short-pulse laser beam generated by the pulse laser excites the surface acoustic wave signal on the surface of the anisotropic material specimen, performs Fourier transform and data fitting processing on the surface acoustic wave signal, and obtains the dispersion curve v of the specimen in a certain direction (f);

[0037] v ( f ) = 2 π ( x 2 - x 1 ) f Φ 2 ( f ) - Φ 1 ( f )

[0...

Embodiment 2

[0057] 201: Obtain the surface acoustic wave dispersion curve and perform curve fitting to obtain the dispersion curve v(f) of the specimen in a certain direction;

[0058] The focused beam of short-pulse laser is used to generate thermoelastic effect on the surface of the test piece, and high-frequency composite ultrasonic surface waves are obtained. Two distances x from the excitation point in a straight line direction 1 and x 2 At the place, the piezoelectric sensor is used together with the data acquisition circuit to pick up, convert, amplify and filter the particle vibration on the surface of the specimen to obtain an effective analog electrical signal (u 1 (t) and u 2 (t)) and sent to a digital oscilloscope for subsequent processing. Use a digital oscilloscope and a computer to perform Fourier transform on the obtained signal, realize the time-frequency domain conversion signal of the vibration pickup signal, and obtain the phase frequency vibration pickup signal Φ ...

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Abstract

The invention discloses a detection method of detecting Young modulus of an anisotropic material surface layer based on surface acoustic wave. The method comprises the following steps: a short pulse laser beam generated by a pulse laser stimulates a surface acoustic wave signal on the surface of an anisotropic material test specimen, and the surface acoustic wave signal is treated with Fourier transform and data fitting to obtain a dispersion curve of the test specimen in a certain direction; a wave equation of the surface acoustic wave signal in an elastic medium is established in a Cartesian coordinate system, and a Christopher equation is obtained and solved by setting an original parameter condition; a corresponding relation of wave velocity and wave number is established according to the boundary conditions of continuous stress, and a theoretical dispersion curve is obtained through a theoretical relation; the dispersion curve obtained through experiments is compared with the dispersion curve obtained through theoretical calculation to determine the Young modulus of the detected test specimen. The method adopts a laser surface acoustic wave technology to obtain the Young modulus of the anisotropic material surface layer, so that the experiment condition and the measuring steps of an industrial site are simplified, and the test time of engineering materials is shortened.

Description

technical field [0001] The invention relates to the technical field of material performance detection, in particular to a detection method for detecting the Young's modulus of an anisotropic material surface based on surface acoustic waves. Background technique [0002] With the rapid development of science and technology, modern industry marked by high temperature, high pressure, high speed and high load has stricter requirements on product quality. As the main means of product quality control and equipment safety operation guarantee, detection technology plays a vital role in modern manufacturing industry and enjoys the reputation of "industrial guard". Compared with the traditional destructive testing technology, the non-destructive testing technology can ensure the product quality without destroying the original shape of the product, and ensure the performance, safety and reliability of the product, thus adapting to the development trend of modern industrial technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
Inventor 林滨武小东李新月许京磊盛金月常志新
Owner TIANJIN UNIV
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