Shock Loading of Granular Ni/Al Composites. Part 1. Mechanics of Loading
Abstract
We present molecular dynamics simulations of the thermomechanical response under shock loading of a granular material consisting of laminated Ni/Al grains. We observe two regimes: At low piston velocities (up ≲ 1km/s), the shock wave is diffuse, and the width of the shock front decreases with increasing piston velocity. Beyond a critical shock strength, however, the width remains relatively constant at approximately the mean grain radius. This change in behavior follows from an evolution of the mechanism of compaction with increasing insult strength. Furthermore, the mechanism evolves from plastic deformation-mediated pore collapse for relatively weak shocks, to solid extrusion and fluid ejecta filling pores ahead of the shock front at intermediate strengths, and finally to atomic jetting into the pore for very strong shocks (up ≳ 2 km/s). High-energy fluid ejecta into pores leads to the formation of flow vorticity and can result in a large fraction of the input energy localizing into translational kinetic energy components including the formation of hot spots. This has implications for the mechanical mixing of Ni and Al in these reactive composites.
- Authors:
-
- Purdue Univ., West Lafayette, IN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Purdue Univ., West Lafayette, IN (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1235675
- Report Number(s):
- LA-UR-14-27896
Journal ID: ISSN 1932-7447
- Grant/Contract Number:
- HDTRA1-10-1-0119; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 118; Journal Issue: 45; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; granular composites; shock loading; energetic materials
Citation Formats
Cherukara, Mathew J., Germann, Timothy C., Kober, Edward M., and Strachan, Alejandro. Shock Loading of Granular Ni/Al Composites. Part 1. Mechanics of Loading. United States: N. p., 2014.
Web. doi:10.1021/jp507795w.
Cherukara, Mathew J., Germann, Timothy C., Kober, Edward M., & Strachan, Alejandro. Shock Loading of Granular Ni/Al Composites. Part 1. Mechanics of Loading. United States. https://doi.org/10.1021/jp507795w
Cherukara, Mathew J., Germann, Timothy C., Kober, Edward M., and Strachan, Alejandro. Thu .
"Shock Loading of Granular Ni/Al Composites. Part 1. Mechanics of Loading". United States. https://doi.org/10.1021/jp507795w. https://www.osti.gov/servlets/purl/1235675.
@article{osti_1235675,
title = {Shock Loading of Granular Ni/Al Composites. Part 1. Mechanics of Loading},
author = {Cherukara, Mathew J. and Germann, Timothy C. and Kober, Edward M. and Strachan, Alejandro},
abstractNote = {We present molecular dynamics simulations of the thermomechanical response under shock loading of a granular material consisting of laminated Ni/Al grains. We observe two regimes: At low piston velocities (up ≲ 1km/s), the shock wave is diffuse, and the width of the shock front decreases with increasing piston velocity. Beyond a critical shock strength, however, the width remains relatively constant at approximately the mean grain radius. This change in behavior follows from an evolution of the mechanism of compaction with increasing insult strength. Furthermore, the mechanism evolves from plastic deformation-mediated pore collapse for relatively weak shocks, to solid extrusion and fluid ejecta filling pores ahead of the shock front at intermediate strengths, and finally to atomic jetting into the pore for very strong shocks (up ≳ 2 km/s). High-energy fluid ejecta into pores leads to the formation of flow vorticity and can result in a large fraction of the input energy localizing into translational kinetic energy components including the formation of hot spots. This has implications for the mechanical mixing of Ni and Al in these reactive composites.},
doi = {10.1021/jp507795w},
journal = {Journal of Physical Chemistry. C},
number = 45,
volume = 118,
place = {United States},
year = {Thu Oct 16 00:00:00 EDT 2014},
month = {Thu Oct 16 00:00:00 EDT 2014}
}
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Works referencing / citing this record:
Architecture-independent reactivity tuning of Ni/Al multilayers by solid solution alloying
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