Mechanical properties of β-HMX

Gallagher, Hugh G., Miller, John C., Sheen, David B. , Sherwood, John N. and Vrcelj, Ranko M. (2015) Mechanical properties of β-HMX. Chemistry Central Journal, 9 (22). pp. 1-15. ISSN 1752-153X

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Mechanical properties of β-HMX
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Background: For a full understanding of the mechanical properties of a material, it is essential to understand the defect structures and associated properties and microhardness indentation is a technique that can aid this understanding. Results: The Vickers hardness on (010), {011} and {110} faces lay in the range of 304-363 MPa. The Knoop Hardnesses on the same faces lay in the range 314-482 MPa. From etching of three indented surfaces, the preferred slip planes have been identified as (001) and (101). For a dislocation glide, the most likely configuration for dislocation movement on the (001) planes is (001) [100] (|b| = 0.65 nm) and for the (101) plane as (101) 101~(|b| = 1.084 nm) although (101) [010] (|b| = 1.105 nm) is possible. Tensile testing showed that at a stress value of 2.3 MPa primary twinning occurred and grew with increasing stress. When the stress was relaxed, the twins decreased in size, but did not disappear. The twinning shear strain was calculated to be 0.353 for the (101) twin plane. Conclusions: HMX is considered to be brittle, compared to other secondary explosives. Comparing HMX with a range of organic solids, the values for hardness numbers are similar to those of other brittle systems. Under the conditions developed beneath a pyramidal indenter, dislocation slip plays a major part in accommodating the local deformation stresses. © 2015 Gallagher et al.; licensee Springer.

Keywords:Energetics, Hardness, HMX, mechanical properties, Tensile testing, bmjgoldcheck, NotOAChecked
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F151 Pharmaceutical Chemistry
Divisions:College of Science > School of Pharmacy
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ID Code:17671
Deposited On:17 Jun 2015 14:05

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