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Journal of Applied Physics / Volume 89 / Issue 9 / STRUCTURAL, MECHANICAL THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER (PACS 61-68, 78)

J. Appl. Phys. 89, 4797 (2001); http://dx.doi.org/10.1063/1.1358319 (6 pages)

Lattice softening and failure in severely deformed molecular crystals

C. S. Coffey1 and J. Sharma2

1Indian Head Division, Naval Surface Warfare Center, Indian Head, Maryland 20640-5035
2Carderock Division, Naval Surface Warfare Center, Carderock, Maryland 20817-5700

(Received 6 March 2000; accepted 29 January 2001)

Atomic force microscope observations have revealed the presence of permanent lattice and molecular distortions in molecular crystals that had undergone plastic deformation by shock or impact. These distortions have led to the suggestion of a deformed lattice potential. Here, the deformed lattice potential is extended to the case of severe plastic deformation in which the lattice softens and may eventually fail. This generalized lattice potential has been incorporated into descriptions of plastic flow and the associated energy dissipation due to dislocation motion by quantum tunneling. The resultant predictions are compared with experiments in which molecular crystals were subjected to severe plastic deformation during impact. © 2001 American Institute of Physics.

© 2001 American Institute of Physics

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KEYWORDS and PACS

Keywords

plastic deformation, plastic flow, dislocation motion, failure (mechanical), atomic force microscopy, shock wave effects, impact (mechanical), potential energy functions

PACS

  • 46.35.+z

    Viscoelasticity, plasticity, viscoplasticity

  • 62.20.F-

    Deformation and plasticity

  • 61.72.Lk

    Linear defects: dislocations, disclinations

  • 66.30.Lw

    Diffusion of other defects

  • 62.50.-p

    High-pressure effects in solids and liquids

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1358319

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. Sharma, S. M. Hoover, C. S. Coffey, A. S. Tompa, H. W. Sandusky, R. W. Armstrong, and W. L. Elban, AIP Conf. Proc. 429, 563 (1997).

    C. S. Coffey and J. Sharma, Phys. Rev. B 60, 9365 (1999).

    A. V. Granato, K. Lucke, J. Schlipf, and L. J. Teutonico, J. Appl. Phys. 35, 2732 (1964)JAPIAU000035000009002732000001.

    C. S. Coffey, Phys. Rev. B 49, 208 (1994).

    C. S. Coffey, Phys. Rev. B 24, 6984 (1981).

    C. S. Coffey, Phys. Rev. B 32, 5335 (1984).

    C. S. Coffey and S. J. Jacobs, J. Appl. Phys. 52, 6991 (1981)JAPIAU000052000011006991000001.


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