Crystalline plasticity is strongly interlinked with dislocation mechanics and nowadays is relatively well understood. Concepts and physical models of plastic deformation in amorphous materials on the other hand - where the concept of linear lattice defects is not applicable - still are lagging behind. We introduce an eigenstrain-based finite element lattice model for simulations of shear band formation and strain avalanches. Our model allows us to study the influence of surfaces and finite size effects on the statistics of avalanches. We find that even with relatively complex loading conditions and open boundary conditions, critical exponents describing avalanche statistics are unchanged, which validates the use of simpler scalar lattice-based models to study these phenomena.
Avalanches, loading and finite size effects in 2D amorphous plasticity : results from a finite element model / S. Sandfeld, Z. Budrikis, S. Zapperi, D.F. Castellanos. - In: JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT. - ISSN 1742-5468. - 2015:2(2015 Feb 01), pp. P02011.1-P02011.18.
|Titolo:||Avalanches, loading and finite size effects in 2D amorphous plasticity : results from a finite element model|
ZAPPERI, STEFANO (Penultimo)
|Parole Chiave:||disordered systems (theory); finite-size scaling; plasticity (theory); surface effects (theory); Statistics and Probability; Statistical and Nonlinear Physics; Statistics, Probability and Uncertainty|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||1-feb-2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1088/1742-5468/2015/02/P02011|
|Appare nelle tipologie:||01 - Articolo su periodico|