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Title: Importance of microstructural features in mechanical response of cast-cured HMX formulations

Abstract

We report that cast-cure formulations of plastic-bonded explosives (PBX) present some advantages in manufacturing and application compared to traditional pressed slurry formulated materials. For example, these formulations can be cast to specific shapes and then cured in place, avoiding the need for machining precision parts. However, the microstructure of these materials can be greatly affected by the specific manufacturing process. Here, we evaluate the effect of minor changes to the formulation and manufacturing process on several cyclotetramethylene-tetranitramine (HMX) PBXs. The binders were based on hydroxyl-terminated polybutadiene (HTPB) and cast-cured using diphenylmethane diisocyanate (isonate) as a curing agent. We examined the materials using X-ray computed tomography (CT) imaging and uniaxial compression testing. The isonate content was found to significantly affect the modulus and strength of the binder. The presence of significant void content could be controlled by adding a centrifuging step during the curing process, but the resulting effect on mechanical properties was relatively minor. Finally, mesoscale simulations showed that differences in the mechanical strength of the binder were not sufficient to describe the differences observed in mechanical testing, indicating that the HMX-binder adhesion was also being changed by the manufacturing process.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [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; Laboratory Directed Research & Development (LDRD)
OSTI Identifier:
1565847
Report Number(s):
LA-UR-17-27947
Journal ID: ISSN 0094-243X
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1979; Conference: SHOCK COMPRESSION OF CONDENSED MATTER, St. Louis, MO (United States), 9-14 July 2017; Journal ID: ISSN 0094-243X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HMX; explosive; PBX; x-ray; microstructure

Citation Formats

Yeager, John David, Manner, Virginia Warren, Stull, Jamie Ann, Walters, David J., Schmalzer, Andrew Michael, Luscher, Darby Jon, and Patterson, Brian M. Importance of microstructural features in mechanical response of cast-cured HMX formulations. United States: N. p., 2018. Web. doi:10.1063/1.5044842.
Yeager, John David, Manner, Virginia Warren, Stull, Jamie Ann, Walters, David J., Schmalzer, Andrew Michael, Luscher, Darby Jon, & Patterson, Brian M. Importance of microstructural features in mechanical response of cast-cured HMX formulations. United States. doi:10.1063/1.5044842.
Yeager, John David, Manner, Virginia Warren, Stull, Jamie Ann, Walters, David J., Schmalzer, Andrew Michael, Luscher, Darby Jon, and Patterson, Brian M. Tue . "Importance of microstructural features in mechanical response of cast-cured HMX formulations". United States. doi:10.1063/1.5044842. https://www.osti.gov/servlets/purl/1565847.
@article{osti_1565847,
title = {Importance of microstructural features in mechanical response of cast-cured HMX formulations},
author = {Yeager, John David and Manner, Virginia Warren and Stull, Jamie Ann and Walters, David J. and Schmalzer, Andrew Michael and Luscher, Darby Jon and Patterson, Brian M.},
abstractNote = {We report that cast-cure formulations of plastic-bonded explosives (PBX) present some advantages in manufacturing and application compared to traditional pressed slurry formulated materials. For example, these formulations can be cast to specific shapes and then cured in place, avoiding the need for machining precision parts. However, the microstructure of these materials can be greatly affected by the specific manufacturing process. Here, we evaluate the effect of minor changes to the formulation and manufacturing process on several cyclotetramethylene-tetranitramine (HMX) PBXs. The binders were based on hydroxyl-terminated polybutadiene (HTPB) and cast-cured using diphenylmethane diisocyanate (isonate) as a curing agent. We examined the materials using X-ray computed tomography (CT) imaging and uniaxial compression testing. The isonate content was found to significantly affect the modulus and strength of the binder. The presence of significant void content could be controlled by adding a centrifuging step during the curing process, but the resulting effect on mechanical properties was relatively minor. Finally, mesoscale simulations showed that differences in the mechanical strength of the binder were not sufficient to describe the differences observed in mechanical testing, indicating that the HMX-binder adhesion was also being changed by the manufacturing process.},
doi = {10.1063/1.5044842},
journal = {AIP Conference Proceedings},
number = ,
volume = 1979,
place = {United States},
year = {2018},
month = {7}
}

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Works referenced in this record:

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