Molecular dynamics simulations of HMX crystal polymorphs using a flexible molecule force field

  • Dmitry Bedrov
  • Chakravarthy Ayyagari
  • Grant D. Smith
  • Thomas D. Sewell
  • Ralph Menikoff
  • Joseph M. Zaug
Article

Abstract

Molecular dynamics simulations using a recently developed quantum chemistry-based atomistic force field [J. Phys. Chem. B, 103 (1999) 3570 ] were performed in order to obtain unit cell parameters, coefficients of thermal expansion, and heats of sublimation for the three pure crystal polymorphs of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). The predictions for β-, α-, and δ-HMX showed good agreement with the available experimental data. For the case of β-HMX, anisotropic sound speeds were calculated from the molecular dynamics simulation-predicted elastic coefficients and compared with recent Impulsive Stimulated Light Scattering (ISLS) sound speed measurements. The level of agreement is encouraging.

HMX crystal Molecular dynamics Physical properties 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Dmitry Bedrov
    • 1
  • Chakravarthy Ayyagari
    • 1
  • Grant D. Smith
    • 1
  • Thomas D. Sewell
    • 2
  • Ralph Menikoff
    • 2
  • Joseph M. Zaug
    • 3
  1. 1.Department of Materials Science and Engineering and Department of Chemical & Fuels EngineeringUniversity of UtahSalt Lake CityU.S.A
  2. 2.Theoretical DivisionLos Alamos National LaboratoryLos AlamosU.S.A
  3. 3.Lawrence Livermore National LaboratoryLivermoreU.S.A

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