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Title: Ultrafast dynamic response of single-crystal β -HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine)

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5029923· OSTI ID:1488771

Here, we report experimental and computational studies of shock wave dynamics in single-crystal β-HMX on an ultrafast time scale. Here, a laser-based compression drive (~1 ns in duration; stresses of up to ~40 GPa) is used to propagate shock waves normal to the (110) and (010) lattice planes. Ultrafast time-domain interferometry measurements reveal distinct, time-dependent relationships between the shock wave velocity and particle velocity for each crystal orientation, which suggest evolving physical processes on a sub-nanosecond time scale. To help interpret the experimental data, elastic shock wave response was simulated using a finite-strain model of crystal thermoelasticity. At early propagation times (<500 ps), the model is in agreement with the data, which indicates that the mechanical response is dominated by thermoelastic deformation. The model agreement depends on the inclusion of nonlinear elastic effects in both the spherical and deviatoric stress-strain responses. This is achieved by employing an equation-of-state and a pressure-dependent stiffness tensor, which was computed via atomistic simulation. At later times (>500 ps), the crystal samples exhibit signatures of inelastic deformation, structural phase transformation, or chemical reaction, depending on the direction of wave propagation.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1488771
Report Number(s):
LLNL-JRNL-747959; 931207
Journal Information:
Journal of Applied Physics, Vol. 123, Issue 20; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (5)

Effects of different types of defects on ignition mechanisms in shocked β-cyclotetramethylene tetranitramine crystals: A molecular dynamics study based on ReaxFF-lg force field journal May 2019
A benchtop shock physics laboratory: Ultrafast laser driven shock spectroscopy and interferometry methods journal June 2019
Non-Schmid effect of pressure on plastic deformation in molecular crystal HMX journal June 2019
The effect of crystal anisotropy and plastic response on the dynamic fracture of energetic materials journal October 2019
A molecular dynamics simulation study of thermal conductivity anisotropy in β -octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine ( β -HMX) journal January 2020

Figures / Tables (8)