Back to Search
Start Over
Universal features of amorphous plasticity
- Source :
- Nature Communications, Vol 8, Iss 1, Pp 1-10 (2017), Nature Communications, Nature communications 8 (2017). doi:10.1038/ncomms15928, info:cnr-pdr/source/autori:Budrikis Z.; Castellanos D. F.; Sandfeld S.; Zaiser M.; Zapperi S./titolo:Universal features of amorphous plasticity/doi:10.1038%2Fncomms15928/rivista:Nature communications/anno:2017/pagina_da:/pagina_a:/intervallo_pagine:/volume:8
- Publication Year :
- 2017
-
Abstract
- Plastic yielding of amorphous solids occurs by power-law distributed deformation avalanches whose universality is still debated. Experiments and molecular dynamics simulations are hampered by limited statistical samples, and although existing stochastic models give precise exponents, they require strong assumptions about fixed deformation directions, at odds with the statistical isotropy of amorphous materials. Here, we introduce a fully tensorial, stochastic mesoscale model for amorphous plasticity that links the statistical physics of plastic yielding to engineering mechanics. It captures the complex shear patterning observed for a wide variety of deformation modes, as well as the avalanche dynamics of plastic flow. Avalanches are described by universal size exponents and scaling functions, avalanche shapes, and local stability distributions, independent of system dimensionality, boundary and loading conditions, and stress state. Our predictions consistently differ from those of mean-field depinning models, providing evidence that plastic yielding is a distinct type of critical phenomenon.<br />The universality class for plastic yield in amorphous materials remains controversial. Here authors present a tensorial mesoscale model that captures both complex shear patterns and avalanche scaling behaviour, which differs from mean-field models and suggests a distinct type of critical phenomenon.
- Subjects :
- Stochastic modelling
Science
General Physics and Astronomy
02 engineering and technology
Plasticity
01 natural sciences
Article
General Biochemistry, Genetics and Molecular Biology
0103 physical sciences
METALLIC-GLASS
STRAIN LOCALIZATION
Statistical physics
010306 general physics
Applied mechanics
Scaling
Physics
Multidisciplinary
ta114
Isotropy
General Chemistry
021001 nanoscience & nanotechnology
Amorphous solid
Universality (dynamical systems)
VISCOPLASTIC DEFORMATION
0210 nano-technology
Curse of dimensionality
Subjects
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- NATURE COMMUNICATIONS
- Accession number :
- edsair.doi.dedup.....508ebb8cbf7320bbf24365da4ee26acc