Spectral Density of Acoustic Emission Signals and Accumulation of Deformation in an Aluminum-Magnesium Alloy at High-Temperature Loading
Abstract
This paper presents results of the study of strain accumulation processes in an aluminum-magnesium alloy at high-temperature loading conditions from room temperature to 500 0C. The analysis of acoustic emission signals spectra is conducted for the conditions of active deformation accumulation: monotone - in the area of low temperatures (up to a temperature of deformation structural transition), stepwise — in the high temperature area. Analysis of spectral density of acoustic emission signals indicates redistribution of vibrational energy of the primary acoustic signal on the resonance vibrations of standing shear and longitudinal waves of the resonator, which geometry corresponds to deformation localization area. It is shown that resonances at selected resonance frequencies are not formed in the spectrum of the signal with a monotonic accumulation of deformation in the area of low temperatures. During stepwise deformation accumulation in the area of high temperatures, the resonator accumulates noticeable vibration energy of standing waves (shear and longitudinal waves). In the crystalline environment, oscillations of standing waves activate elementary deformation shifts which are related to the length of the standing wave that defines the macroscopic scale of correlation.
DOI 10.14258/izvasu(2017)4-07
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