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Mesoscale simulations of shock compaction of a granular ceramic: effects of mesostructure and mixed-cell strength treatment

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Title: Mesoscale simulations of shock compaction of a granular ceramic: effects of mesostructure and mixed-cell strength treatment
Authors: Derrick, J
LaJeunesse, J
Davison, T
Collins, G
Borg, J
Item Type: Journal Article
Abstract: The shock response of granular materials is important in a variety of contexts but the precise dynamics of grains during compaction is poorly understood. Here we use 2D mesoscale numerical simulations of the shock compaction of granular tungsten carbide to investigate the effect of internal structure within the particle bed and ’stiction’ between grains on the shock response. An increase in the average number of contacts with other particles, per particle, tends to shift the Hugoniot to higher shock velocities, lower particle velocities and lower densities. This shift is sensitive to inter-particle shear resistance. Eulerian shock physics codes approximate friction between, and interlocking of, grains with their treatment of mixed cell strength (stiction) and here we show that this has a significant effect on the shock response. When studying the compaction of particle beds it is not common to quantify the pre-compaction internal structure, yet our results suggest that such differences should be taken into account, either by using identical beds or by averaging results over multiple experiments.
Issue Date: 23-Feb-2018
Date of Acceptance: 22-Jan-2018
URI: http://hdl.handle.net/10044/1/56299
DOI: https://dx.doi.org/10.1088/1361-651X/aaab7e
ISSN: 0965-0393
Publisher: IOP Publishing
Journal / Book Title: Modelling and Simulation in Materials Science and Engineering
Volume: 26
Issue: 3
Copyright Statement: © 2018 IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence . Any further distribution of this work must maintain attribution to the author ( s ) and the title of the work, journal citation and DOI
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Engineering and Physical Sciences Research Council
Funder's Grant Number: ST/N000803/1
EP/M506345/1
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Materials Science
Physics
iSALE
CTH
mesoscale simulations
shock compaction
granular materials
mesostructure
DYNAMIC COMPACTION
BEHAVIOR
POWDERS
0912 Materials Engineering
Materials
Publication Status: Published
Article Number: 035009
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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