Bulletin of the American Physical Society
17th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 56, Number 6
Sunday–Friday, June 26–July 1 2011; Chicago, Illinois
Session J3: First-Principles and Molecular Dynamics Calculations VI: Metals II
11:00 AM–12:30 PM,
Tuesday, June 28, 2011
Room: Renaissance Ballroom AB
Chair: S. N. Luo, Los Alamos National Laboratory
Abstract ID: BAPS.2011.SHOCK.J3.1
Abstract: J3.00001 : Steady two-zone elastic-plastic shock waves in solids*
11:00 AM–11:30 AM
Preview Abstract Abstract
(University of South Florida)
By decoupling time and length scales in moving window molecular dynamics simulations of steady shock waves, a new regime of shock wave propagation was observed. It is characterized by a steady two-zone elastic-plastic structure of a single shock wave, and consists of a leading low-pressure elastic zone followed by a high-pressure plastic zone. Both elastic and plastic shock fronts move with the same speed and have a fixed net separation that can extend to many microns. The material in the elastic zone is in a metastable state having a pressure that substantially exceeds the critical shock strength characteristic of the onset of the well-known split-elastic-plastic, two-wave propagation. The two-zone elastic-plastic single wave is a quite general phenomenon observed in simulations of a broad class of crystalline materials. It is the existence of the two-zone, elastic-plastic regime that allows for a consistent explanation of the anomalously high elastic wave amplitudes observed in recent experiments.
*This work is supported by the Office of Naval Research, Naval Research Laboratory and National Science Foundation.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.SHOCK.J3.1
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