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The Acoustic Emission Characteristic of Coated Sheet Metal Deformation

Author: ZhouMeng
Tutor: LongShiGuo
School: Xiangtan University
Course: Physical Electronics
Keywords: Acoustic emission Nickel-plated steel Parametric analysis Spectrum Analyzer Wavelet transform
CLC: TG115.28
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Acoustic emission testing technology because of its non-destructive, real-time, on-site, the advantages of simple equipment has become an important non-destructive testing and evaluation tools, is widely used. Nickel-plated steel strip is a high performance battery casing material, but will appear in the production, processing and use nickel coating cracking, how to detect the failure behavior is very important, acoustic emission technique is an effective way to study the issue . In this thesis, nickel-plated steel, acoustic emission detection technology and coating sheet metal acoustic emission testing are reviewed, and acoustic emission signal processing parameters analysis, spectrum analysis, time-frequency transform research tensile nickel-plated steel strip, The indentation deformation acoustic emission characteristics, the main research results are as follows: (1) nickel-plated steel strip tensile deformation of the acoustic emission characteristics, the first design plated nickel strip stretching acoustic emission detection experimental program, with computer-controlled electronic universal testing The machine, with PAC? Type II acoustic emission system acquisition of acoustic emission signals nickel-plated steel strip, and its analysis of acoustic emission signals. The results showed that the amplitude of the acoustic emission, ring count, rise time and other parameters change with nickel-plated steel strip specimen damage evolution in good agreement. Nickel-plated steel strip specimen plastic deformation, necking and fracture phenomena, the acoustic emission signal increased significantly, necking the stage acoustic emission signal amplitude are mostly distributed in 43? 79 dB of range. Nickel-plated steel strip of acoustic emission signals clocked at 150 kHz or 230 kHz or 270 kHz. (2) indentation testing process nickel-plated steel strip of acoustic emission characteristics, design indentation acoustic emission detection experiments, HVS-30 type digital display Vickers hardness test hardness and acoustic emission systems for real-time acquisition of acoustic emission signals. The results showed that acoustic emission parameters with the depth of the indentation associated effectively filter out the noise of acoustic emission signals by wavelet transform, five wavelet decomposition, the base acoustic emission signal frequency is mainly concentrated in the 128? 256 kHz, plated nickel strip acoustic emission signal frequency is mainly concentrated in the 128? 256 kHz and 256? 512 KHz. (3) the preparation and application of acoustic emission signals based on LabVIEW the spectrum transform and frequency extraction procedures. Using LabVIEW signal processing and analysis toolbox prepared by fast Fourier transform (STFT) procedures and frequency extraction procedure signal STFT program analysis processing the results AEwin wavelet transform results, the former is higher than the latter in the frequency domain resolution. STFT program analysis of the comparison signal processing result AEwin the spectrum transform the results were compared, the acoustic emission signal frequency extraction process can provide more information. Through this study, the acoustic emission characteristics of the coated sheet metal tensile and indentation, LabVIEW program written quickly, effective treatment of acoustic emission signals nickel-plated steel strip, the findings coating sheet metal acoustic emission testing some reference value.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Physical test method > NDT
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