On the similarity of plastic flow processes during smooth and jerky flow: Statistical analysis
| Autor: | Denis Entemeyer, N. P. Kobelev, Mikhail Lebyodkin, Claude Fressengeas, Y. Bougherira, V. S. Gornakov, T.A. Lebedkina, I. V. Shashkov |
|---|---|
| Přispěvatelé: | Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Institute of Solid State Physics (ISSP, RAS), Russian Academy of Sciences [Moscow] (RAS), Institute of Solid State Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Length scale
Self-organization Materials science Polymers and Plastics Scale (ratio) Thermodynamics 02 engineering and technology Plasticity Synchronization 01 natural sciences law.invention law Intermittency 0103 physical sciences [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] Portevin-Le Chatelier effect Acoustic methods 010306 general physics Mesoscopic physics Dislocation dynamics Metals and Alloys Portevin–Le Chatelier effect Mechanics 021001 nanoscience & nanotechnology Electronic Optical and Magnetic Materials Acoustic emission Macroscopic scale Ceramics and Composites 0210 nano-technology |
| Zdroj: | Acta Materialia Acta Materialia, Elsevier, 2012, 60 (9), pp.3729-3740. ⟨10.1016/j.actamat.2012.03.026⟩ |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2012.03.026⟩ |
| Popis: | International audience; Jerky flow in dilute alloys, or the Portevin-Le Chatelier effect, is investigated using statistical analysis of time series characterizing the evolution of the plastic activity at distinct scales of observation, namely, the macroscopic scale of stress serrations and a mesoscopic scale pertaining to the accompanying acoustic emission. Whereas the stress serrations display various types of statistical distributions depending on the driving strain rate, including power-law, peaked and bimodal histograms, it is found that acoustic emission is characterized by power-law statistics of event size in all experimental conditions. The latter reflect intermittency and self-organization of plastic activity at a mesoscopic scale. This shift in the observed dynamics when the observation length scale is decreased is discussed in terms of the synchronization of small-scale events. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect