2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 1: Aifantis Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Bordas S, Estrin Y |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Scaling Effects in Reversible Microplastic Strain
Sergey Kustov1; Vladimir Nikolaev2;1UNIVERSITY OF BALEARIC ISLANDS, Palma de Mallorca, Spain; 2ITMO UNIVERSITY, 197101, St. Petersburg, Russian Federation;
Type of Paper: Regular
Id Paper: 193
Topic: 1
Abstract:
Experimental studies of the non-linear internal friction is an efficient tool to derive reversible (microplastic or anelastic) dislocation or twin-related strain as a function of stress amplitude or temperature. We analyze here the anelastic behaviour (both dislocation and twin boundary related) of different crystalline solids based on the non-linear internal friction data obtained by different techniques. We give experimental evidence that the microplastic reversible strain is heterogeneous in space and intermittent in time, just like its macroscopic irreversible counterpart. It is shown that the stress - anelastic strain response for different materials can demonstrate both a scale-free power law (jamming-like dynamics) and typical depinning critical behaviour. We found that in the case of jamming-like dynamics, the stress exponent can vary substantially for the dislocation microplastic strain in different crystals, but is universal for microplastic strain related to twin boundary motion in a variety of martensitic structures.