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Electromagnetic acoustic emission non-destructive testing method for non-ferromagnetic metal sheet and device adopting same

A metal sheet, non-destructive testing technology, applied in the direction of material magnetic variables, etc., can solve the problems of extracting materials, difficulty, and inability to detect activity status information, and achieve the effect of expanding the scope of application

Inactive Publication Date: 2012-08-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an electromagnetic non-destructive testing method and device thereof for non-ferromagnetic metal sheets, which is an electromagnetic non-destructive testing method and device for non-ferromagnetic metal sheets based on eddy current excitation acoustic emission, overcoming It solves the problem that the existing electromagnetic detection method cannot detect the activity state information of material defects and the existing acoustic emission detection technology is difficult to extract the weak signal of material local defects from the overall signal

Method used

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  • Electromagnetic acoustic emission non-destructive testing method for non-ferromagnetic metal sheet and device adopting same
  • Electromagnetic acoustic emission non-destructive testing method for non-ferromagnetic metal sheet and device adopting same
  • Electromagnetic acoustic emission non-destructive testing method for non-ferromagnetic metal sheet and device adopting same

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Experimental program
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Effect test

Embodiment 1

[0032] When starting to detect, the signal generator output control signal in the eddy current generator is 2 cycles, the frequency is 5kHz and the square wave voltage of voltage is 8V, and this signal is input to the power amplifier connected to the 190V DC power supply in the eddy current generator, the power The amplifier generates a pulse voltage with the same frequency and equal number of cycles as the control signal and a voltage of 190V. The pulse square wave voltage is loaded on the circuit composed of the resonant capacitor and the exciting coil, and is tested in a 500mm×115mm×15mm A quasi-sinusoidal eddy current with 2 cycles and a frequency of 5kHz is induced on the aluminum sheet. If there is a crack in the aluminum sheet to be detected, an acoustic emission signal will be excited, and the acoustic emission signal is detected by four piezoelectric sensors S 1 , S 2 , S 3 and S 4 It is detected and input to the preamplifier through the signal line, the acoustic em...

Embodiment 2

[0037] The output control signal of the signal generator in the eddy current generator is 5 cycles, the frequency is 10kHz and the pulse square wave voltage is 8V. The non-ferromagnetic metal sheet to be detected is a copper metal sheet to be detected with a size of 500mm×115mm×15mm Except, other are all the same as embodiment 1.

[0038] The position of the crack defect in the copper metal sheet to be detected is detected by the final positioning, and the positioning error is 1-2mm.

Embodiment 3

[0040] The output control signal of the signal generator in the eddy current generator is 3 cycles, the frequency is 7.5kHz and the pulse square wave voltage is 380V. Except the copper metal sheet, others are all the same as embodiment 1.

[0041] The position of the crack defect in the copper metal sheet to be detected is detected by the final positioning, and the positioning error is 1-2 mm.

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Abstract

The invention relates to an electromagnetic acoustic emission non-destructive testing method for a non-ferromagnetic metal sheet and a device adopting the testing method, and relates to the test for a metal material by utilizing an acoustic emission technology. The testing method comprises the following steps of: loading a pulse vortex generated by a vortex generator onto a to-be-tested non-ferromagnetic metal sheet; if the to-be-tested non-ferromagnetic metal sheet has a crack, arousing an acoustic emission signal; detecting and collecting the acoustic emission signal by four piezoelectric sensors; inputting into a preamplifier through a signal line; inputting into a PC (Personal Computer) machine after amplifying; performing two-dimensional time difference positioning by the PC machine according to the collected acoustic emission signal; and positioning and detecting the crack defect of the to-be-tested non-ferromagnetic metal sheet. The device comprises the vortex generator, four piezoelectric transducers, the preamplifier and the PC machine. The method and device provided by the invention are used for overcoming the defect that for the existing electromagnetic testing method, active state information of the material can not be detected to obtain, and solving the difficulty that for the existing acoustic emission detecting technology, a local defect weak signal of the material is difficult to extract from the whole signal.

Description

technical field [0001] The technical scheme of the present invention relates to the method and device for testing metal materials using acoustic wave emission technology, specifically the electromagnetic acoustic emission non-destructive testing method and device for non-ferromagnetic metal thin plates. Background technique [0002] Electromagnetic testing is an experimental method that uses the electrical and magnetic properties or material response characteristics (such as vibration characteristics, stress concentration characteristics or acoustic emission characteristics) of materials under electromagnetic action to judge the relevant performance and defects of materials, and can realize the detection of material defects. The non-contact non-destructive testing has the advantages of high sensitivity and fast detection speed, and has been widely used in manufacturing, aerospace, petrochemical and other industrial fields. In the prior art, methods for detecting material def...

Claims

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Application Information

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IPC IPC(8): G01N27/90
Inventor 刘素贞金亮张闯杨庆新张献李阳
Owner HEBEI UNIV OF TECH
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