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Title: Model for ratchet growth in PBX 9502

Abstract

Polycrystalline solids composed of crystals with anisotropic thermal expansion coefficients exhibit ratchet growth (RG), a phenomenon characterized by a cumulative and irreversible volume expansion that develops upon exposing the material to cyclic excursions in temperature. We developed a statistical model for RG. The model attributes RG to the formation of intergranular cracks caused by tessellated internal stresses that develop during the thermal excursions. It is postulated that different sets of internal cracks form upon heating and cooling the polycrystalline solid. The model reproduces RG measurements in pressed TATB and PBX 9502 energetic materials and suggests an explanation for why the amplitude of RG generated by a heating excursion is larger than that generated by a subsequent cooling excursion of the same amplitude.

Authors:
 [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 Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1561072
Report Number(s):
LA-UR-16-23334
Journal ID: ISSN 1359-6454
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 180; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Ratchet Growth; statistical model; TATB; PBX 9502

Citation Formats

Schwarz, R. B. Model for ratchet growth in PBX 9502. United States: N. p., 2019. Web. doi:10.1016/j.actamat.2019.08.050.
Schwarz, R. B. Model for ratchet growth in PBX 9502. United States. doi:10.1016/j.actamat.2019.08.050.
Schwarz, R. B. Fri . "Model for ratchet growth in PBX 9502". United States. doi:10.1016/j.actamat.2019.08.050.
@article{osti_1561072,
title = {Model for ratchet growth in PBX 9502},
author = {Schwarz, R. B.},
abstractNote = {Polycrystalline solids composed of crystals with anisotropic thermal expansion coefficients exhibit ratchet growth (RG), a phenomenon characterized by a cumulative and irreversible volume expansion that develops upon exposing the material to cyclic excursions in temperature. We developed a statistical model for RG. The model attributes RG to the formation of intergranular cracks caused by tessellated internal stresses that develop during the thermal excursions. It is postulated that different sets of internal cracks form upon heating and cooling the polycrystalline solid. The model reproduces RG measurements in pressed TATB and PBX 9502 energetic materials and suggests an explanation for why the amplitude of RG generated by a heating excursion is larger than that generated by a subsequent cooling excursion of the same amplitude.},
doi = {10.1016/j.actamat.2019.08.050},
journal = {Acta Materialia},
number = C,
volume = 180,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
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This content will become publicly available on November 1, 2020
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