Particle displacements in the elastic deformation of amorphous materials: local fluctuations vs. non-affine field

C. Goldenberg; A. Tanguy; J. -L. Barrat

doi:10.1209/0295-5075/80/16003

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Particle displacements in the elastic deformation of amorphous materials: local fluctuations vs. non-affine field

C. Goldenberg·A. Tanguy·J. -L. Barrat

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Abstract

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.

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C. Goldenberg, A. Tanguy, J. -L. Barrat. 2007-09-15. Particle displacements in the elastic deformation of amorphous materials: local fluctuations vs. non-affine field. https://doi.org/10.1209/0295-5075%2F80%2F16003

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