Ultrafast dynamic response of single crystal β-HMX

• Main Authors: Zaug, Joseph M., Armstrong, Michael R., Crowhurst, Jonathan C., Radousky, Harry B., Ferranti, Louis, Swan, Raymond, Gross, Rick, Teslich, Nick E., Wall, Mark A., Austin, Ryan A., Fried, Laurence E.
• Format: Conference Proceeding
• Language: English
• Subjects: Dynamic response; Elastic anisotropy; Elastic waves; Energetic materials; HMX; Interferometry; Longitudinal waves; Plane waves; Single crystals
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.4971500

We report results from ultrafast compression experiments conducted on β-HMX single crystals. Results consist of nominally 12 picosecond time-resolved wave profile data, (ultrafast time domain interferometry –TDI measurements), that were analyzed to determine high-velocity wave speeds as a function of piston velocity. TDI results are used to validate calculations of anisotropic stress-strain behavior of shocked loaded energetic materials. Our previous results derived using a 350 ps duration compression drive revealed anisotropic elastic wave response in single crystal β-HMX from (110) and (010) impact planes. Here we present results using a 1.05 ns duration compression drive with a 950 ps interferometry window to extend knowledge of the anisotropic dynamic response of β-HMX within eight microns of the initial impact plane. We observe two distinct wave profiles from (010) and three wave profiles from (010) impact planes. The (110) impact plane wave speeds typically exceed (010) impact plane wave speeds at the same piston velocities. The development of multiple hydrodynamic wave profiles begins at 20 GPa for the (110) impact plane and 28 GPa for the (10) impact plane. We compare our ultrafast TDI results with previous gun and plate impact results on β-HMX and PBX9501.