Sound impedance characteristics of metal material&rsquo;s acoustic emission signal propagation

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (13) : 197-201.

Sound impedance characteristics of metal material’s acoustic emission signal propagation

MAO Hanying1, LIUTing2, FAN Jianwen1, MAO Hanling3

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Abstract

Sound impedance is an important physical quantity to characterize dynamic characteristics of metals. Studying propagation characteristics of acoustic emission (AE) signals using sound impedance is helpful to application of AE signals in damage detection. Here, based on reviewing studies on metal material sound impedance’s actual measurement and estimation, the sound impedance estimation method based on AE signals was proposed, and the method to estimate a metal material’s sound impedance was explored using its lead-broken AE signals after it firstly loaded and then unloaded. Numerical simulation and test data analysis showed that lead broken AE signals can be used to estimate sound impedance changes of a metal material bearing load, metal material’s sound impedance estimation value based on its AE signals can better characterize AE signal propagation characteristics; even the sound impedance imaging may be realized for a metal material bearing load process to become a new direction of material inside damage detection.

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metal / acoustic emission / sound impedance / experiment / damage

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MAO Hanying1, LIUTing2, FAN Jianwen1, MAO Hanling3. Sound impedance characteristics of metal material’s acoustic emission signal propagation[J]. Journal of Vibration and Shock, 2019, 38(13): 197-201

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