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:
-
[1];
[1];
[1];
[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; 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. https://doi.org/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. https://doi.org/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 = {Tue Jul 03 00:00:00 EDT 2018},
month = {Tue Jul 03 00:00:00 EDT 2018}
}
Search WorldCat to find libraries that may hold this journalWeb of Science
Works referenced in this record:
A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives
journal, June 2011
- Barua, Ananda; Zhou, Min
- Modelling and Simulation in Materials Science and Engineering, Vol. 19, Issue 5
Essential Features of fine Scale Boundary Conditions for Second Gradient Multiscale Homogenization of Statistical Volume Elements
journal, January 2012
- Luscher, Darby; McDowell, David; Bronkhorst, Curt
- International Journal for Multiscale Computational Engineering, Vol. 10, Issue 5
In Situ Imaging during Compression of Plastic Bonded Explosives for Damage Modeling
journal, June 2017
- Manner, Virginia W.; Yeager, John D.; Patterson, Brian M.
- Materials, Vol. 10, Issue 6
Elasticity of Crystalline Molecular Explosives
journal, April 2015
- Hooks, Daniel E.; Ramos, Kyle J.; Bolme, C. A.
- Propellants, Explosives, Pyrotechnics, Vol. 40, Issue 3
Overall behaviour of heterogeneous elastoviscoplastic materials: effect of microstructural modelling
journal, August 2000
- van der Sluis, O.; Schreurs, P. J. G.; Brekelmans, W. A. M.
- Mechanics of Materials, Vol. 32, Issue 8
Experimental and numerical analysis of mode II fracture between propellant and insulation
journal, July 2014
- Niu, Ran-Ming; Zhou, Qing-Chun; Chen, Xiong
- International Journal of Adhesion and Adhesives, Vol. 52
Examination of Morphological Changes that Affect Gas Permeation through Thermally Damaged Explosives
journal, October 2004
- Parker, Gary?R.; Peterson, Paul?D.; Asay, Blaine?W
- Propellants, Explosives, Pyrotechnics, Vol. 29, Issue 5