Two-zone elastic-plastic single shock waves in solids.

By decoupling time and length scales in moving window molecular dynamics shock-wave simulations, a new regime of shock-wave propagation is uncovered characterized by a two-zone elastic-plastic shock-wave structure consisting of a leading elastic front followed by a plastic front, both moving with the same average speed and having a fixed net thickness that can extend to microns. The material in the elastic zone is in a metastable state that supports a pressure that can substantially exceed the critical pressure characteristic of the onset of the well-known split-elastic-plastic, two-wave propagation. The two-zone elastic-plastic wave is a general phenomenon observed in simulations of a broad class of crystalline materials and is within the reach of current experimental techniques.

[1]  T. Germann,et al.  Atomistic simulations of shock-induced transformations and their orientation dependence in bcc Fe single crystals , 2005 .

[2]  D. Kalantar,et al.  Shock deformation of face-centred-cubic metals on subnanosecond timescales , 2006, Nature materials.

[3]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.

[4]  Vladimir E. Fortov,et al.  Shock-Wave Phenomena and the Properties of Condensed Matter , 2004 .

[5]  R. Graham,et al.  Solids Under High-Pressure Shock Compression , 1993 .

[6]  P. Steinhardt,et al.  Bond-orientational order in liquids and glasses , 1983 .

[7]  J. Wark,et al.  Measuring stacking fault densities in shock-compressed FCC crystals using in situ x-ray diffraction , 2006 .

[8]  Gilbert W. Collins,et al.  Direct observation of the alpha-epsilon transition in shock-compressed iron via nanosecond x-ray diffraction. , 2005, Physical review letters.

[9]  M. Armstrong,et al.  Ultrafast observation of shocked states in a precompressed material , 2010 .

[10]  Raymond F. Smith,et al.  Ultrahigh Strength in Nanocrystalline Materials Under Shock Loading , 2005, Science.

[11]  S. Anisimov,et al.  Shock wave structure in dense gases , 1997 .

[12]  Katsunobu Nishihara,et al.  Molecular dynamics simulation of femtosecond ablation and spallation with different interatomic potentials , 2009 .

[13]  Eduardo M. Bringa,et al.  Atomistic Shock Hugoniot simulation of single-crystal copper , 2004 .

[14]  Andrew G. Glen,et al.  APPL , 2001 .

[15]  P. S. Komarov,et al.  Behavior of aluminum near an ultimate theoretical strength in experiments with femtosecond laser pulses , 2010 .

[16]  R. Graham.  Solids Under High-Pressure Shock Compression: Mechanics, Physics, and Chemistry , 1992 .

[17]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[18]  Holian,et al.  Plasticity induced by shock waves in nonequilibrium molecular-dynamics simulations , 1998, Science.

[19]  Brad Lee Holian,et al.  Large‐Scale Molecular Dynamics Simulations of Ejecta Formation in Copper , 2004 .

[20]  James Russell Asay,et al.  Reshock and release response of aluminum single crystal , 2007 .

[21]  David S. Moore,et al.  The elastic-plastic response of aluminum films to ultrafast laser-generated shocks , 2011 .