The duration-energy-size enigma for acoustic emission

Abstract Acoustic emission (AE) measurements of avalanches in different systems, such as domain movements in ferroics or the collapse of voids in porous materials, cannot be compared with model predictions without a detailed analysis of the AE process. In particular, most AE experiments scale the av...

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Autores principales:	Blai Casals, Karin A. Dahmen, Boyuan Gou, Spencer Rooke, Ekhard K. H. Salje
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/76e1eadfb31c4251bd61ecb54cec20d7
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id	oai:doaj.org-article:76e1eadfb31c4251bd61ecb54cec20d7
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spelling	oai:doaj.org-article:76e1eadfb31c4251bd61ecb54cec20d72021-12-02T13:30:50ZThe duration-energy-size enigma for acoustic emission10.1038/s41598-021-84688-72045-2322https://doaj.org/article/76e1eadfb31c4251bd61ecb54cec20d72021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84688-7https://doaj.org/toc/2045-2322Abstract Acoustic emission (AE) measurements of avalanches in different systems, such as domain movements in ferroics or the collapse of voids in porous materials, cannot be compared with model predictions without a detailed analysis of the AE process. In particular, most AE experiments scale the avalanche energy E, maximum amplitude Amax and duration D as E ~ A max x and A max ~ D χ with x = 2 and a poorly defined power law distribution for the duration. In contrast, simple mean field theory (MFT) predicts that x = 3 and χ = 2. The disagreement is due to details of the AE measurements: the initial acoustic strain signal of an avalanche is modified by the propagation of the acoustic wave, which is then measured by the detector. We demonstrate, by simple model simulations, that typical avalanches follow the observed AE results with x = 2 and ‘half-moon’ shapes for the cross-correlation. Furthermore, the size S of an avalanche does not always scale as the square of the maximum AE avalanche amplitude A max as predicted by MFT but scales linearly S ~ A max . We propose that the AE rise time reflects the atomistic avalanche time profile better than the duration of the AE signal.Blai CasalsKarin A. DahmenBoyuan GouSpencer RookeEkhard K. H. SaljeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Blai Casals Karin A. Dahmen Boyuan Gou Spencer Rooke Ekhard K. H. Salje The duration-energy-size enigma for acoustic emission
description	Abstract Acoustic emission (AE) measurements of avalanches in different systems, such as domain movements in ferroics or the collapse of voids in porous materials, cannot be compared with model predictions without a detailed analysis of the AE process. In particular, most AE experiments scale the avalanche energy E, maximum amplitude Amax and duration D as E ~ A max x and A max ~ D χ with x = 2 and a poorly defined power law distribution for the duration. In contrast, simple mean field theory (MFT) predicts that x = 3 and χ = 2. The disagreement is due to details of the AE measurements: the initial acoustic strain signal of an avalanche is modified by the propagation of the acoustic wave, which is then measured by the detector. We demonstrate, by simple model simulations, that typical avalanches follow the observed AE results with x = 2 and ‘half-moon’ shapes for the cross-correlation. Furthermore, the size S of an avalanche does not always scale as the square of the maximum AE avalanche amplitude A max as predicted by MFT but scales linearly S ~ A max . We propose that the AE rise time reflects the atomistic avalanche time profile better than the duration of the AE signal.
format	article
author	Blai Casals Karin A. Dahmen Boyuan Gou Spencer Rooke Ekhard K. H. Salje
author_facet	Blai Casals Karin A. Dahmen Boyuan Gou Spencer Rooke Ekhard K. H. Salje
author_sort	Blai Casals
title	The duration-energy-size enigma for acoustic emission
title_short	The duration-energy-size enigma for acoustic emission
title_full	The duration-energy-size enigma for acoustic emission
title_fullStr	The duration-energy-size enigma for acoustic emission
title_full_unstemmed	The duration-energy-size enigma for acoustic emission
title_sort	duration-energy-size enigma for acoustic emission
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/76e1eadfb31c4251bd61ecb54cec20d7
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The duration-energy-size enigma for acoustic emission

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