Correlation between hot spots and 3-D defect structure in single and polycrystalline high-explosive materials. (2017)

• Record Type: Journal Article
• Authors: Hawkins, Cameron; Tschauner, Oliver; Fussell, Zachary; Smith, Jesse
• Is Part Of: Procedia engineering. Volume 204(2017)
• Page Start: 360
• Page End: 366
• Publication Date: 2017
• Subjects: high-explosive materials -- shock physics -- x-ray diffraction -- tomography -- lang-topography; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2017.09.778
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: A novel approach that spatially identifies inhomogeneities from microscale (defects, con-formational disorder) to mesoscale (voids, inclusions) is developed using synchrotron x-ray methods: tomography, Lang topography, and micro-diffraction mapping. These techniques provide a non-destructive method for characterization of mm-sized samples prior to shock experiments. These characterization maps can be used to correlate continuum level measurements in shock compression experiments to the mesoscale and microscale structure. Specifically examined is a sample of C4. We show extensive conformational disorder in gamma-RDX, which is the main component. Further, we observe that the minor HMX-component in C4 contains at least two different phases: alpha- and beta-HMX in spatially variable amounts. PETN sprayed film was found to be very homogeneously fine grained with modest preferred orientation of crystallites and modest rotational disorder of nitro-groups.