Investigating shock processes in bimodal powder compaction through modelling and experiment at the mesoscale

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Title: Investigating shock processes in bimodal powder compaction through modelling and experiment at the mesoscale
Authors: Derrick, JG
Rutherford, ME
Chapman, DJ
Davison, TM
Duarte, JPP
Farbaniec, L
Bland, PA
Eakins, DE
Collins, GS
Item Type: Journal Article
Abstract: Impact-driven compaction is a proposed mechanism for the lithification of primordial bimodal granular mixtures from which many meteorites derive. We present a numerical-experimental mesoscale study that investigates the fundamental processes in shock compaction of this heterogeneous matter, using analog materials. Experiments were performed at the European Synchrotron Radiation Facility generating real-time, in-situ, X-ray radiographs of the shock's passage in representative granular systems. Mesoscale simulations were performed using a shock physics code and set-ups that were geometrically identical to the experiments. We considered two scenarios: pure matrix, and matrix with a single chondrule. Good agreement was found between experiments and models in terms of shock position and post-shock compaction in the pure powder setup. When considering a single grain embedded in matrix we observed a spatial porosity anisotropy in its vicinity; the compaction was greater in the region immediately shockward of the grain, and less in its lee. We introduced the porosity vector, C, which points in the direction of lowest compaction across a chondrule. This direction-dependent observation may present a new way to decode the magnitude, and direction, of a single shock wave experienced by a meteorite in the past.
Issue Date: 23-Dec-2018
Date of Acceptance: 21-Dec-2018
ISSN: 0020-7683
Publisher: Elsevier BV
Journal / Book Title: International Journal of Solids and Structures
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Engineering and Physical Sciences Research Council
Funder's Grant Number: ST/N000803/1
Keywords: 09 Engineering
Mechanical Engineering & Transports
Publication Status: Published online
Embargo Date: 2019-12-23
Online Publication Date: 2018-12-23
Appears in Collections:Faculty of Engineering
Earth Science and Engineering

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