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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
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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

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References

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