Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-10-18
Europhysics Letters 80, 16003 (2007)
Physics
Condensed Matter
Statistical Mechanics
Minor corrections to match the published version
Scientific paper
10.1209/0295-5075/80/16003
We study the local disorder in the deformation of amorphous materials by decomposing the particle displacements into a continuous, inhomogeneous field and the corresponding fluctuations. We compare these fields to the commonly used non-affine displacements in an elastically deformed 2D Lennard-Jones glass. Unlike the non-affine field, the fluctuations are very localized, and exhibit a much smaller (and system size independent) correlation length, on the order of a particle diameter, supporting the applicability of the notion of local "defects" to such materials. We propose a scalar "noise" field to characterize the fluctuations, as an additional field for extended continuum models, e.g., to describe the localized irreversible events observed during plastic deformation.
Barrat Jean Louis
Goldenberg Chay
Tanguy Anne
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