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Amorphous systems in athermal, quasistatic shear.

Craig E Maloney¹, Anaël Lemaître

¹Department of Physics, University of California, Santa Barbara, CA 93106, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|August 16, 2006

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Computer simulations reveal that plastic events in amorphous materials are discrete, catastrophic failures. These events, composed of localized shear transformations, organize into transient slip lines, independent of specific interaction potentials.

Area of Science:

Condensed Matter Physics
Materials Science
Computational Materials Science

Background:

Amorphous systems exhibit complex mechanical behavior under stress.
Understanding plastic deformation in disordered materials is crucial for various applications.

Purpose of the Study:

To investigate the nature of plastic events in two-dimensional amorphous systems under simple shear.
To analyze the spatial and temporal organization of plastic deformation.
To determine the universality of plastic behavior across different interaction potentials.

Main Methods:

Athermal, quasistatic computer simulations of two-dimensional amorphous systems.
Analysis of system trajectories to identify elastic and plastic events.
Characterization of the structure and organization of plastic deformation events.

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Main Results:

Plastic events are discrete, catastrophic failures interrupting smooth elastic loading.
Plastic events originate from localized shear transformations organizing into system-spanning slip lines.
The emergent plastic behavior is insensitive to the specific interaction potentials used.

Conclusions:

Plastic deformation in these disordered systems is characterized by intermittent, localized events.
The observed phenomena, particularly slip line organization, are universal across different interaction potentials.
Findings are relevant to metallic glasses, soft glassy systems, and granular materials.