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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F13%3A10193107%21RIV14-GA0-11320___
rdf:type
skos:Concept n17:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1103/PhysRevE.88.042402
dcterms:description
Various dynamical systems with many degrees of freedom display avalanche dynamics, which is characterized by scale invariance reflected in power-law statistics. The superposition of avalanche processes in real systems driven at a finite velocity may influence the experimental determination of the underlying power law. The present paper reports results of an investigation of this effect using the example of acoustic emission (AE) accompanying plastic deformation of crystals. Indeed, recent studies of AE did not only prove that the dynamics of crystal defects obeys power-law statistics, but also led to a hypothesis of universality of the scaling law. We examine the sensitivity of the apparent statistics of AE to the parameters applied to individualize AE events. Two different alloys, MgZr and AlMg, both displaying strong AE but characterized by different plasticity mechanisms, are investigated. It is shown that the power-law indices display a good robustness in wide ranges of parameters even in the conditions leading to very strong superposition of AE events, although some deviations from the persistent values are also detected. The totality of the results confirms the scale-invariant character of deformation processes on the scale relevant to AE, but uncovers essential differences between the power-law exponents found for two kinds of alloys. Various dynamical systems with many degrees of freedom display avalanche dynamics, which is characterized by scale invariance reflected in power-law statistics. The superposition of avalanche processes in real systems driven at a finite velocity may influence the experimental determination of the underlying power law. The present paper reports results of an investigation of this effect using the example of acoustic emission (AE) accompanying plastic deformation of crystals. Indeed, recent studies of AE did not only prove that the dynamics of crystal defects obeys power-law statistics, but also led to a hypothesis of universality of the scaling law. We examine the sensitivity of the apparent statistics of AE to the parameters applied to individualize AE events. Two different alloys, MgZr and AlMg, both displaying strong AE but characterized by different plasticity mechanisms, are investigated. It is shown that the power-law indices display a good robustness in wide ranges of parameters even in the conditions leading to very strong superposition of AE events, although some deviations from the persistent values are also detected. The totality of the results confirms the scale-invariant character of deformation processes on the scale relevant to AE, but uncovers essential differences between the power-law exponents found for two kinds of alloys.
dcterms:title
Role of superposition of dislocation avalanches in the statistics of acoustic emission during plastic deformation Role of superposition of dislocation avalanches in the statistics of acoustic emission during plastic deformation
skos:prefLabel
Role of superposition of dislocation avalanches in the statistics of acoustic emission during plastic deformation Role of superposition of dislocation avalanches in the statistics of acoustic emission during plastic deformation
skos:notation
RIV/00216208:11320/13:10193107!RIV14-GA0-11320___
n17:predkladatel
n18:orjk%3A11320
n3:aktivita
n12:I n12:P
n3:aktivity
I, P(GAP108/11/1267)
n3:cisloPeriodika
4
n3:dodaniDat
n14:2014
n3:domaciTvurceVysledku
n6:4554175 n6:9089292 n6:4773586
n3:druhVysledku
n16:J
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
103382
n3:idVysledku
RIV/00216208:11320/13:10193107
n3:jazykVysledku
n20:eng
n3:klicovaSlova
smooth; alloys; behavior; polycrystalline; transformations; dynamics; jerky flow; power-law distributions; self-organized criticality
n3:klicoveSlovo
n4:power-law%20distributions n4:behavior n4:jerky%20flow n4:polycrystalline n4:smooth n4:self-organized%20criticality n4:alloys n4:transformations n4:dynamics
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[7EC70CF43F76]
n3:nazevZdroje
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
n3:obor
n15:BM
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
6
n3:projekt
n7:GAP108%2F11%2F1267
n3:rokUplatneniVysledku
n14:2013
n3:svazekPeriodika
88
n3:tvurceVysledku
Lebyodkin, M. A. Lebedkina, T. A. Chmelík, František Mathis, Kristián Dobroň, Patrik Shashkov, I. V.
n3:wos
000326045900005
s:issn
1539-3755
s:numberOfPages
8
n21:doi
10.1103/PhysRevE.88.042402
n11:organizacniJednotka
11320