Preferred Void Orientation in Uniaxially Pressed PBX 9502
Abstract
Ultra- and small-angle neutron scattering techniques were used to study the morphology of voids in directions parallel and perpendicular to the compaction plane of a uniaxially pressed cylinder of PBX 9502. Two-dimensional scattering patterns from samples cut parallel to the compaction plane had circular equal-intensity contours, implying that along this view the voids are circular or randomly oriented. Identical measurements of samples cut perpendicular to the compaction plane produced elliptical equal-intensity contours, indicating preferred orientation of voids. Analysis of the two dimensional scattering patterns confirmed that the voids are non-spherical with an average aspect ratio of 1.20, flattened so that the larger dimensions of the voids lie within the compaction plane. Model analysis of the combined ultra- and small-angle neutron scattering curves revealed that the PBX 9502 porosity is interconnected, in the form of aggregates comprised of non-spherical, primary voids. The volume dimension was found to be the same in both directions, indicating that the aggregate is randomly oriented throughout the sample, and that it is the primary voids that are preferentially oriented. Furthermore, void interfaces with the surrounding matrix were found to be rough or polydisperse, with a common roughness dimension or polydispersity in all directions.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF)
- OSTI Identifier:
- 1735906
- Report Number(s):
- LA-UR-20-23353
Journal ID: ISSN 0721-3115
- Grant/Contract Number:
- 89233218CNA000001; DMR-1508249
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Propellants, Explosives, Pyrotechnics
- Additional Journal Information:
- Journal Volume: 46; Journal Issue: 1; Journal ID: ISSN 0721-3115
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; PBX 9502, anisotropy, porosity, fractal, SANS
Citation Formats
Mang, Joseph T., and Hjelm, Rex Paul Jr. Preferred Void Orientation in Uniaxially Pressed PBX 9502. United States: N. p., 2020.
Web. doi:10.1002/prep.202000154.
Mang, Joseph T., & Hjelm, Rex Paul Jr. Preferred Void Orientation in Uniaxially Pressed PBX 9502. United States. https://doi.org/10.1002/prep.202000154
Mang, Joseph T., and Hjelm, Rex Paul Jr. Thu .
"Preferred Void Orientation in Uniaxially Pressed PBX 9502". United States. https://doi.org/10.1002/prep.202000154. https://www.osti.gov/servlets/purl/1735906.
@article{osti_1735906,
title = {Preferred Void Orientation in Uniaxially Pressed PBX 9502},
author = {Mang, Joseph T. and Hjelm, Rex Paul Jr.},
abstractNote = {Ultra- and small-angle neutron scattering techniques were used to study the morphology of voids in directions parallel and perpendicular to the compaction plane of a uniaxially pressed cylinder of PBX 9502. Two-dimensional scattering patterns from samples cut parallel to the compaction plane had circular equal-intensity contours, implying that along this view the voids are circular or randomly oriented. Identical measurements of samples cut perpendicular to the compaction plane produced elliptical equal-intensity contours, indicating preferred orientation of voids. Analysis of the two dimensional scattering patterns confirmed that the voids are non-spherical with an average aspect ratio of 1.20, flattened so that the larger dimensions of the voids lie within the compaction plane. Model analysis of the combined ultra- and small-angle neutron scattering curves revealed that the PBX 9502 porosity is interconnected, in the form of aggregates comprised of non-spherical, primary voids. The volume dimension was found to be the same in both directions, indicating that the aggregate is randomly oriented throughout the sample, and that it is the primary voids that are preferentially oriented. Furthermore, void interfaces with the surrounding matrix were found to be rough or polydisperse, with a common roughness dimension or polydispersity in all directions.},
doi = {10.1002/prep.202000154},
journal = {Propellants, Explosives, Pyrotechnics},
number = 1,
volume = 46,
place = {United States},
year = {Thu Dec 03 00:00:00 EST 2020},
month = {Thu Dec 03 00:00:00 EST 2020}
}
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