Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-27T02:28:35.683Z Has data issue: false hasContentIssue false
  • English
  • Français

Massively Parallel Molecular Dynamics Simulations of Two-dimensional Materials at High Strain Rates

Published online by Cambridge University Press:  01 January 1992

Norman J. Wagner  and
Brad Lee Holian
Norman J. Wagner
Affiliation:
Department of Chemical EngineeringUniversity of Delaware Newark, DE 19716
Brad Lee Holian
Affiliation:
Los Alamos National LaboratoryLos Alamos, NM 87545
Get access

Abstract

Large scale molecular dynamics simulations on a massively parallel computer are performed to investigate the mechanical behavior of 2-dimensional materials. A model embedded atom many- body potential is examined, corresponding to “ductile” materials. A parallel MD algorithm is developed to exploit the architecture of the Connection Machine, enabling simulations of > 106atoms. A model spallation experiment is performed on a 2-D triagonal crystal with a well-defined nanocrystalline defect on the spall plane. The process of spallation is modelled as a uniform adiabatic expansion. The spall strength is shown to be proportional to the logarithm of the applied strain rate and a dislocation dynamics model is used to explain the results. Good predictions for the onset of spallation in the computer experiments is found from the simple model. The nanocrystal defect affects the propagation of the shock front and failure is enhanced along the grain boundary.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 291: Symposium O – Materials Theory and Modeling , 1992 , 91
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Kelly, A. and Macmillan, N.,Strong Solids Clarendon Press, Oxford, 1986.Google Scholar
2. Wagner, N.J., Holian, B.L., and Voter, A.F., Physical Review A 45, 8457 (1992).Google Scholar
3. Harding, J., editor, Mechanical Properties at High Rates of Strain, 1984, volume 70, The Institute of Physics, Bristol and London, 1984.Google Scholar
4. Follansbee, P., in Shock Waves in Condensed Matter 1987, edited by Schmidt, S. and Holmes, N., page 249, 1988.Google Scholar
5. Holian, B.L., in Shock Waves in Condensed Matter 1987, edited by Schmidt, S. and Holmes, N., page 185, 1988.Google Scholar
6. Allen, M. and Tilsedey, D., Computer Simulation of Liquids, Clarendon Press, Oxford, 2nd edition, 1989.Google Scholar
7. Holian, B.L. et al. , Phys. Rev. A 43, 2655 (1991).Google Scholar
8. Keribas, A. and Zakharenko, I., in Mechanical Properties at High Rates of Strain, 1984, edited by Harding, J., page 277, 1984.Google Scholar