Optimization and Plasticity in Disordered Media

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2009
Major/Subject
Mcode
Degree programme
Language
en
Pages
225502/1-4
Series
Physical Review Letters, Volume 103, Issue 22
Abstract
We study the plastic yielding of disordered media using the perfectly plastic random fuse model. The yield surfaces are shown to be different from those obtained minimizing the sum of the local yield thresholds, i.e., the so-called minimum “energy” surfaces. As a result, the global yield stress is lower than expected from naive optimization and the difference persists as the sample size increases. At variance with minimum energy surfaces, height-height fluctuations of yield surfaces exhibit multiscaling. We provide a theoretical argument that explains how this behavior arises from the very different nature of the optimization problem in both cases.
Description
Keywords
plasticity, disordered systems
Other note
Citation
Picallo, Clara B. & López, Juan M. & Zapperi, Stefano & Alava, Mikko J. 2009. Optimization and Plasticity in Disordered Media. Physical Review Letters. Volume 103, Issue 22. 225502/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.103.225502.