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Title: 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.

Authors:
ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (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. https://doi.org/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.
@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 = {2020},
month = {12}
}

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