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Phys. Rev. Lett. 90, 045506 (2003) [4 pages]

Dynamics of Large-Scale Plastic Deformation and the Necking Instability in Amorphous Solids

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L. O. Eastgate
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853

J. S. Langer and L. Pechenik
Department of Physics, University of California, Santa Barbara, California 93106

Received 19 June 2002; published 31 January 2003

We use the shear transformation zone (STZ) theory of dynamic plasticity to study the necking instability in a two-dimensional strip of amorphous solid. Our Eulerian description of large-scale deformation allows us to follow the instability far into the nonlinear regime. We find a strong rate dependence; the higher the applied strain rate, the further the strip extends before the onset of instability. The material hardens outside the necking region, but the description of plastic flow within the neck is distinctly different from that of conventional time-independent theories of plasticity.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.90.045506
DOI: 10.1103/PhysRevLett.90.045506
PACS: 62.20.Fe, 46.05.+b, 46.35.+z, 83.60.Df

* Present address: Department of Physics, University of California, Santa Barbara, CA 93106.

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