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Title: Neutron diffraction measurements and micromechanical modelling of temperature-dependent variations in TATB lattice parameters

Abstract

Triaminotrinitrobenzene (TATB) is a highly anisotropic molecular crystal used in several plastic-bonded explosive (PBX) formulations. TATB-based explosives exhibit irreversible volume expansion (“ratchet growth”) when thermally cycled. A theoretical understanding of the relationship between anisotropy of the crystal, crystal orientation distribution (texture) of polycrystalline aggregates, and the intergranular interactions leading to this irreversible growth is necessary to accurately develop physics-based predictive models for TATB-based PBXs under various thermal environments. In this work, TATB lattice parameters were measured using neutron diffraction during thermal cycling of loose powder and a pressed pellet. The measured lattice parameters help clarify conflicting reports in the literature as these new results are more consistent with one set of previous results than another. The lattice parameters of pressed TATB were also measured as a function of temperature, showing some differences from the powder. This data is used along with anisotropic single-crystal stiffness moduli reported in the literature to model the nominal stresses associated with intergranular constraints during thermal expansion. The texture of both specimens were characterized and the pressed pellet exhibits preferential orientation of (001) poles along the pressing direction, whereas no preferred orientation was found for the loose powder. Lastly, thermal strains for single-crystal TATB computed frommore » lattice parameter data for the powder is input to a self-consistent micromechanical model, which predicts the lattice parameters of the constrained TATB crystals within the pellet. The agreement of these model results with the diffraction data obtained from the pellet is discussed along with future directions of research.« less

Authors:
 [1];  [1];  [1];  [1];  [1]
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  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:
1255254
Report Number(s):
LA-UR-15-28030
Journal ID: ISSN 0721-3115
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Propellants, Explosives, Pyrotechnics
Additional Journal Information:
Journal Volume: 824; Journal Issue: C; Journal ID: ISSN 0721-3115
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; TATB; Explosive; Neutron; Diffraction

Citation Formats

Yeager, John D., Luscher, Darby J., Vogel, Sven C., Clausen, Bjorn, and Brown, Donald W.. Neutron diffraction measurements and micromechanical modelling of temperature-dependent variations in TATB lattice parameters. United States: N. p., 2016. Web. https://doi.org/10.1002/prep.201500286.
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Yeager, John D., Luscher, Darby J., Vogel, Sven C., Clausen, Bjorn, & Brown, Donald W.. Neutron diffraction measurements and micromechanical modelling of temperature-dependent variations in TATB lattice parameters. United States. https://doi.org/10.1002/prep.201500286
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Yeager, John D., Luscher, Darby J., Vogel, Sven C., Clausen, Bjorn, and Brown, Donald W.. Tue . "Neutron diffraction measurements and micromechanical modelling of temperature-dependent variations in TATB lattice parameters". United States. https://doi.org/10.1002/prep.201500286. https://www.osti.gov/servlets/purl/1255254.
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@article{osti_1255254,
title = {Neutron diffraction measurements and micromechanical modelling of temperature-dependent variations in TATB lattice parameters},
author = {Yeager, John D. and Luscher, Darby J. and Vogel, Sven C. and Clausen, Bjorn and Brown, Donald W.},
abstractNote = {Triaminotrinitrobenzene (TATB) is a highly anisotropic molecular crystal used in several plastic-bonded explosive (PBX) formulations. TATB-based explosives exhibit irreversible volume expansion (“ratchet growth”) when thermally cycled. A theoretical understanding of the relationship between anisotropy of the crystal, crystal orientation distribution (texture) of polycrystalline aggregates, and the intergranular interactions leading to this irreversible growth is necessary to accurately develop physics-based predictive models for TATB-based PBXs under various thermal environments. In this work, TATB lattice parameters were measured using neutron diffraction during thermal cycling of loose powder and a pressed pellet. The measured lattice parameters help clarify conflicting reports in the literature as these new results are more consistent with one set of previous results than another. The lattice parameters of pressed TATB were also measured as a function of temperature, showing some differences from the powder. This data is used along with anisotropic single-crystal stiffness moduli reported in the literature to model the nominal stresses associated with intergranular constraints during thermal expansion. The texture of both specimens were characterized and the pressed pellet exhibits preferential orientation of (001) poles along the pressing direction, whereas no preferred orientation was found for the loose powder. Lastly, thermal strains for single-crystal TATB computed from lattice parameter data for the powder is input to a self-consistent micromechanical model, which predicts the lattice parameters of the constrained TATB crystals within the pellet. The agreement of these model results with the diffraction data obtained from the pellet is discussed along with future directions of research.},
doi = {10.1002/prep.201500286},
journal = {Propellants, Explosives, Pyrotechnics},
number = C,
volume = 824,
place = {United States},
year = {2016},
month = {2}
}
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    Flow-through compression cell for small-angle and ultra-small-angle neutron scattering measurements
    journal, May 2018

    • Hjelm, Rex P.; Taylor, Mark A.; Frash, Luke P.
    • Review of Scientific Instruments, Vol. 89, Issue 5
    • DOI: 10.1063/1.5022678

    Thermal cycling and ratchet growth of as-pressed TATB pellets
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    • Woznick, Caitlin S.; Thompson, Darla Graff; DeLuca, Racci
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    • DOI: 10.1063/1.5044808

    Effective Thermoelasticity of Polymer-Bonded Particle Composites with Imperfect Interfaces and Thermally Expansive Interphases
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