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Energetic Crystal-Lattice-Dependent Responses

Published online by Cambridge University Press:  15 February 2011

R. W. Armstrong ,
H. L. Ammon ,
Z. Y. Du ,
W. L. Elban  and
X. J. Zhang
R. W. Armstrong
Affiliation:
Department of Mechanical EngineeringUniversity of Maryland, College Park, MD 20742.
H. L. Ammon
Affiliation:
Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742.
Z. Y. Du
Affiliation:
Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742.
W. L. Elban
Affiliation:
Dept. Engineering Science, Loyola College, Baltimore, MD 21210.
X. J. Zhang
Affiliation:
Department of Mechanical EngineeringUniversity of Maryland, College Park, MD 20742.
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Abstract

The occurrence of [100] direction slip on the (021) slip plane of orthorhombic RDX (cyclotrimethylenetrinitramine, (CH2·N·NO2]3) is shown to favor the formation of 1,3-dinitroso-5-nitro-l,3,5-triazacyclohexane, as detected in drop-weight impact tests at sensitivity height levels near to those measured for initiation. Also, the reported observation of deformation twinning in the chemically-related monoclinic HMX (cyclotetra-methylenetetranitramine, (CH2·N·NO2 ]4) crystal lattice is explained on the basis of the greater flexibility of the larger HMX molecule allowing a number of bond rotations that are required to produce a relatively unusual Type II deformation twinning structure. These examples give support to the consideration that on the molecular level involved in deformation-induced decompositions there may be a direct mechanical force aspect that is additional to the established importance of “hot spot” heating, say, as described for dislocation pile-up avalanches in RDX.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 296: Symposium Y – Structure and Properties of Energetic Materials , 1992 , 227
Copyright
Copyright © Materials Research Society 1993

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References

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