DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: TATB ratchet growth and hydrostatically-confined PBX 9502

Abstract

The explosive TATB (1,3,5-triamino-2,4,6-trinitirobenzene) is formulated with various polymeric binders to create plastic-bonded explosives like PBX 9502 (95 wt% TATB and 5 wt% Kel-F binder). TATB crystals are graphitic and plate-like in nature and single crystals exhibit anisotropic thermal expansion where the direction normal to the platelet surface grows 10-20 times more than the in-plane platelet direction. Compactions of TATB, with and without binder, exhibit irreversible volume expansion, also known as ratchet growth, when thermal cycled to hot or cold temperatures. Specifically, when TATB-based compactions return to ambient after a temperature excursion away from room temperature, the volume of the specimen is slightly larger. Repeated thermal cycles can reduce the density by 1 to 2%. Axial confinement on a cylindrical specimen has previously been shown by us to suppress growth in the confining direction but then increase growth in the unconfined directions (likely due to creep effects). In the work presented here, PBX 9502 specimens were placed in cup assemblies where they were embedded in Sylgard (an incompressible silicon resin) to provide hydrostatic confinement when the assemblies were placed under different axial loads. The loaded cup assemblies were thermally cycled 10 times to hot and cold temperatures. Finally, results showmore » that increasing the hydrostatic confining pressure causes a decrease in the PBX 9502 volume expansion that occurs.« less

Authors:
ORCiD logo [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
OSTI Identifier:
1739929
Report Number(s):
LA-UR-19-26638
Journal ID: ISSN 0094-243X; TRN: US2205395
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 2272; Journal Issue: 1; Conference: 21.Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter (SHOCK19), Portland, OR (United States), 16-21 Jun 2019; Journal ID: ISSN 0094-243X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Woznick, Caitlin Savanna, Thompson, Darla Graff, and DeLuca, Racci. TATB ratchet growth and hydrostatically-confined PBX 9502. United States: N. p., 2020. Web. doi:10.1063/12.0000786.
Woznick, Caitlin Savanna, Thompson, Darla Graff, & DeLuca, Racci. TATB ratchet growth and hydrostatically-confined PBX 9502. United States. https://doi.org/10.1063/12.0000786
Woznick, Caitlin Savanna, Thompson, Darla Graff, and DeLuca, Racci. Wed . "TATB ratchet growth and hydrostatically-confined PBX 9502". United States. https://doi.org/10.1063/12.0000786. https://www.osti.gov/servlets/purl/1739929.
@article{osti_1739929,
title = {TATB ratchet growth and hydrostatically-confined PBX 9502},
author = {Woznick, Caitlin Savanna and Thompson, Darla Graff and DeLuca, Racci},
abstractNote = {The explosive TATB (1,3,5-triamino-2,4,6-trinitirobenzene) is formulated with various polymeric binders to create plastic-bonded explosives like PBX 9502 (95 wt% TATB and 5 wt% Kel-F binder). TATB crystals are graphitic and plate-like in nature and single crystals exhibit anisotropic thermal expansion where the direction normal to the platelet surface grows 10-20 times more than the in-plane platelet direction. Compactions of TATB, with and without binder, exhibit irreversible volume expansion, also known as ratchet growth, when thermal cycled to hot or cold temperatures. Specifically, when TATB-based compactions return to ambient after a temperature excursion away from room temperature, the volume of the specimen is slightly larger. Repeated thermal cycles can reduce the density by 1 to 2%. Axial confinement on a cylindrical specimen has previously been shown by us to suppress growth in the confining direction but then increase growth in the unconfined directions (likely due to creep effects). In the work presented here, PBX 9502 specimens were placed in cup assemblies where they were embedded in Sylgard (an incompressible silicon resin) to provide hydrostatic confinement when the assemblies were placed under different axial loads. The loaded cup assemblies were thermally cycled 10 times to hot and cold temperatures. Finally, results show that increasing the hydrostatic confining pressure causes a decrease in the PBX 9502 volume expansion that occurs.},
doi = {10.1063/12.0000786},
journal = {AIP Conference Proceedings},
number = 1,
volume = 2272,
place = {United States},
year = {Wed Nov 04 00:00:00 EST 2020},
month = {Wed Nov 04 00:00:00 EST 2020}
}

Works referenced in this record:

Time-Evolution of TATB-Based Irreversible Thermal Expansion (Ratchet Growth)
journal, July 2015

  • Graff Thompson, Darla; Schwarz, Ricardo B.; Brown, Geoff W.
  • Propellants, Explosives, Pyrotechnics, Vol. 40, Issue 4
  • DOI: 10.1002/prep.201400214

Growth of 1,3,5-Triamino-2,4,6-trinitrobenzene (TATB) I. Anisotropic thermal expansion
journal, March 1979


The Effect of Shear Strain on Texture in Pressed Plastic Bonded Explosives
journal, May 2013

  • Schwarz, Ricardo B.; Brown, Geoffrey W.; Thompson, Darla G.
  • Propellants, Explosives, Pyrotechnics, Vol. 38, Issue 5
  • DOI: 10.1002/prep.201200204

Thermal Cycling and Ratchet Growth of TATB and PBX 9502
journal, May 2019

  • Thompson, Darla Graff; Woznick, Caitlin; DeLuca, Racci
  • Propellants, Explosives, Pyrotechnics, Vol. 44, Issue 7
  • DOI: 10.1002/prep.201800357

Characterizing the Effects of Ratchet Growth on pbx 9502
conference, January 2009

  • Thompson, D. G.; Brown, G. W.; Mang, J. T.
  • SHOCK COMPRESSION OF CONDENSED MATTER 2009: Proceedings of the American Physical Society Topical Group on Shock Compression of Condensed Matter, AIP Conference Proceedings
  • DOI: 10.1063/1.3295152

The Effects of TATB Ratchet Growth on PBX 9502
journal, October 2010

  • Thompson, Darla G.; Brown, Geoff W.; Olinger, Bart
  • Propellants, Explosives, Pyrotechnics, Vol. 35, Issue 6
  • DOI: 10.1002/prep.200900067

Thermal cycling and ratchet growth of as-pressed TATB pellets
conference, January 2018

  • Woznick, Caitlin S.; Thompson, Darla Graff; DeLuca, Racci
  • SHOCK COMPRESSION OF CONDENSED MATTER - 2017: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, AIP Conference Proceedings
  • DOI: 10.1063/1.5044808