A method and device for evaluating the heat treatment effect of materials by nonlinear electromagnetic ultrasonic resonance
An electromagnetic ultrasonic and nonlinear acoustic technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, generation of ultrasonic waves/sonic waves/infrasonic waves, and measurement devices. It can solve the problem of increased testing costs, increased equipment volume, and difficulties in evaluating materials. and other issues to achieve the effect of stable coupling state and improved signal-to-noise ratio
Active Publication Date: 2020-07-28
XIAMEN UNIV
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Problems solved by technology
This situation makes it very difficult to use ordinary electromagnetic ultrasonic transducers to receive high-order harmonics generated by ultrasonic propagation during the detection process to analyze the nonlinear response of materials and evaluate materials, and the development of high-power electromagnetic ultrasonic probes It will inevitably lead to the increase of the volume of the equipment and the improvement of the detection cost.
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[0018] Example: see Figure 1 to Figure 4 , a device for nonlinear electromagnetic ultrasonic resonance evaluation of heat treatment effect of materials, comprising signal excitation / receiver 1, electromagnetic ultrasonic excitation probe 2, electromagnetic ultrasonic receiving probe 3, preamplifier 4, oscilloscope 5 and computer 6. The signal excitation / receiver 1 excites an ultrasonic signal of a certain frequency, connects to the electromagnetic ultrasonic excitation probe 2 and introduces it into the test piece M, connects the electromagnetic ultrasonic receiving probe 3 at the other end of the test piece M, detects the propagating sound wave signal, and passes through the front After being placed in the amplifier 4, it is filtered and sent to the oscilloscope 5. The oscilloscope 5 acquires the received signal waveform and inputs it into the computer 6; the data obtained by the signal excitation / receiver 1 is also input into the computer 6 for signal analysis.
[0019] A m...
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The invention discloses a method and device for evaluating the material heat treatment effect by nonlinear electromagnetic ultrasonic resonance. The method comprises the steps that the an electromagnetic ultrasonic shear wave is excited by scanning frequency and all the ultrasonic shear wave resonance frequencies in a specimen are obtained, and the appropriate resonance three-time harmonic frequency f and the corresponding non-resonance fundamental wave frequency f / 3 of the appropriate resonance three-time harmonic frequency f are selected to excite signals of the corresponding frequency and obtain three-time harmonic amplitude A3 in the frequency spectrum of the received signal and an amplitude A1 of fundamental frequency wave to construct resonance nonlinear parameterstau<r>=A<3> / A1 of the specimen; and based on a value tau<r>of the relative cubic nonlinear acoustic parameters, the nonlinear acoustic parameters of intact materials and the nonlinear acoustic parameters of materials after different degree annealed heat treatment are compared, and the heat treatment effect of metal materials is compared, detected and evaluated.
Description
technical field [0001] The invention discloses a method and device for evaluating the heat treatment effect of materials by nonlinear electromagnetic ultrasonic resonance, which belongs to the technical field of material testing according to the International Patent Classification (IPC), and specifically relates to non-destructive evaluation and evaluation of material properties by using nonlinear ultrasonic waves. Representation technology. Background technique [0002] Electromagnetic ultrasonic testing technology is a relatively mature non-contact ultrasonic non-destructive testing technology developed and applied at present. Magnetostrictive effect, so as to excite ultrasonic stress wave in the material to detect and evaluate the material, no couplant is needed in the detection process, and online rapid detection can be realized. Ultrasonic physical properties that are widely used in ultrasonic testing and evaluation technologies include sound velocity and attenuation. ...
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IPC IPC(8): G01N29/04G01N29/24G01N29/34G01N29/36
Inventor 李卫彬江畅许亚茹
Owner XIAMEN UNIV