It is shown that in a low-stability crystalline medium oscillations of a standing wave activate elementary deformation shears in a certain volume, which is related to the standing wave length and determines correlation at the macroscopic scale. It is also established that the correlated deformation shears generate acoustic signals satisfying the coherency condition, whose interference results in a unit acoustic signal of anomalously high amplitude. An analysis of the low-frequency spectrum of acoustic emission from aluminum under conditions of its high-temperature plastic deformation indicates that its discrete pattern is controlled by re-distribution of the vibrational energy of the primary acoustic signal over the resonant vibrations of the resonator standing waves.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 81–86, July, 2014.
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Makarov, S.V., Plotnikov, V.A. & Potekaev, A.I. Macroscopic Correlation of Deformation Events in Low-Stability State of the Crystal Lattice and Spectral Density of Acoustic Emission Signals. Russ Phys J 57, 950–955 (2014). https://doi.org/10.1007/s11182-014-0329-0
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DOI: https://doi.org/10.1007/s11182-014-0329-0