Shock Loading of Granular Ni/Al Composites. Part 1. Mechanics of Loading

Cherukara, Mathew J.; Germann, Timothy C.; Kober, Edward M.; Strachan, Alejandro

doi:10.1021/jp507795w

Title: Shock Loading of Granular Ni/Al Composites. Part 1. Mechanics of Loading

Journal Article · Thu Oct 16 00:00:00 EDT 2014 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/jp507795w· OSTI ID:1235675

Cherukara, Mathew J. ^[1]; Germann, Timothy C. ^[2]; Kober, Edward M. ^[2]; Strachan, Alejandro ^[3]

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)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: HDTRA1-10-1-0119; AC52-06NA25396

OSTI ID:: 1235675

Report Number(s):: LA-UR-14-27896

Journal Information:: Journal of Physical Chemistry. C, Vol. 118, Issue 45; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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Shock-Induced Chemistry: Molecular Dynamics and Coarse Grain Modeling Islam, Md Mahbubul; Cherukara, Mathew; Antillon, Edwin Computational Approaches for Chemistry Under Extreme Conditions https://doi.org/10.1007/978-3-030-05600-1_8	book	February 2019
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