Issue |
EPL
Volume 80, Number 1, October 2007
|
|
---|---|---|
Article Number | 16003 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
DOI | https://doi.org/10.1209/0295-5075/80/16003 | |
Published online | 10 September 2007 |
Particle displacements in the elastic deformation of amorphous materials: Local fluctuations vs. non-affine field
1
Laboratoire de Physique et Mécanique des Milieux Hétérogènes (CNRS UMR 7636), ESPCI 10 rue Vauquelin, F-75231 Paris Cedex 05, France
2
Laboratoire de Physique de la Matière Condensée et Nanostructures, Univ. Lyon; Univ. Lyon 1; CNRS UMR 5586, Domaine Scientifique de la Doua - F-69622 Villeurbanne Cedex, France
Corresponding authors: chayg@pmmh.espci.fr atanguy@lpmcn.univ-lyon1.fr barrat@lpmcn.univ-lyon1.fr
Received:
26
April
2007
Accepted:
13
August
2007
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.
PACS: 61.43.-j – Disordered solids / 83.10.Bb – Kinematics of deformation and flow / 46.65.+g – Continuum mechanics of solids: Random phenomena and media
© Europhysics Letters Association, 2007
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