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Title: Thermal Cycling and Ratchet Growth of TATB and PBX 9502

Abstract

The irreversible volume expansion, or ratchet growth, of TATB and PBX 9502 (95 weight% TATB) compactions has been quantified over a wide range of thermal cycles. While the precise TATB texture distributions of these specimen sets are likely different from each other, we believe they are consistent within each set, as the expansion data show reproducibility and consistency. These data provide a baseline characterization of the ratchet growth phenomenon in these materials. The increased expansion that comes with changes in the temperature range of the cycles is quantified, repeated hot cycles growing far more than cold. For thermal cycles above ambient where the temperature range is increased in subsequent cycles, the growth of a given cycle is shown to be dictated by previously-established growth trajectories, and the specimen will grow according to the growth potential associated with the temperature range of the present cycle. Alternating hot-cold cycles greatly enhances the cold-cycle contributions as compared to the growth of cold cycles alone. These “rules” of ratchet growth are first established, then observed to hold true for more complex sequences of hot and cold cycles. Finally, a simple equation is used to parameterize the response of individual data sets.

Authors:
 [1];  [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 Nuclear Security Administration (NNSA)
OSTI Identifier:
1532708
Alternate Identifier(s):
OSTI ID: 1532576
Report Number(s):
LA-UR-18-30374
Journal ID: ISSN 0721-3115
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Propellants, Explosives, Pyrotechnics
Additional Journal Information:
Journal Volume: 44; Journal Issue: 7; Journal ID: ISSN 0721-3115
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; TATB; PBX 9502; ratchet growth; thermal expansion; texture

Citation Formats

Thompson, Darla Graff, Woznick, Caitlin Savanna, and DeLuca, Racci. Thermal Cycling and Ratchet Growth of TATB and PBX 9502. United States: N. p., 2019. Web. doi:10.1002/prep.201800357.
Thompson, Darla Graff, Woznick, Caitlin Savanna, & DeLuca, Racci. Thermal Cycling and Ratchet Growth of TATB and PBX 9502. United States. doi:10.1002/prep.201800357.
Thompson, Darla Graff, Woznick, Caitlin Savanna, and DeLuca, Racci. Mon . "Thermal Cycling and Ratchet Growth of TATB and PBX 9502". United States. doi:10.1002/prep.201800357.
@article{osti_1532708,
title = {Thermal Cycling and Ratchet Growth of TATB and PBX 9502},
author = {Thompson, Darla Graff and Woznick, Caitlin Savanna and DeLuca, Racci},
abstractNote = {The irreversible volume expansion, or ratchet growth, of TATB and PBX 9502 (95 weight% TATB) compactions has been quantified over a wide range of thermal cycles. While the precise TATB texture distributions of these specimen sets are likely different from each other, we believe they are consistent within each set, as the expansion data show reproducibility and consistency. These data provide a baseline characterization of the ratchet growth phenomenon in these materials. The increased expansion that comes with changes in the temperature range of the cycles is quantified, repeated hot cycles growing far more than cold. For thermal cycles above ambient where the temperature range is increased in subsequent cycles, the growth of a given cycle is shown to be dictated by previously-established growth trajectories, and the specimen will grow according to the growth potential associated with the temperature range of the present cycle. Alternating hot-cold cycles greatly enhances the cold-cycle contributions as compared to the growth of cold cycles alone. These “rules” of ratchet growth are first established, then observed to hold true for more complex sequences of hot and cold cycles. Finally, a simple equation is used to parameterize the response of individual data sets.},
doi = {10.1002/prep.201800357},
journal = {Propellants, Explosives, Pyrotechnics},
number = 7,
volume = 44,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
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This content will become publicly available on May 13, 2020
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