Imperial College London

Professor Gareth Collins

Faculty of EngineeringDepartment of Earth Science & Engineering

Professor of Planetary Science
 
 
 
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Contact

 

+44 (0)20 7594 1518g.collins Website

 
 
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Location

 

4.83Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Derrick:2018:10.1016/j.ijsolstr.2018.12.025,
author = {Derrick, JG and Rutherford, ME and Chapman, DJ and Davison, TM and Duarte, JPP and Farbaniec, L and Bland, PA and Eakins, DE and Collins, GS},
doi = {10.1016/j.ijsolstr.2018.12.025},
journal = {International Journal of Solids and Structures},
title = {Investigating shock processes in bimodal powder compaction through modelling and experiment at the mesoscale},
url = {http://dx.doi.org/10.1016/j.ijsolstr.2018.12.025},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - 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.
AU - Derrick,JG
AU - Rutherford,ME
AU - Chapman,DJ
AU - Davison,TM
AU - Duarte,JPP
AU - Farbaniec,L
AU - Bland,PA
AU - Eakins,DE
AU - Collins,GS
DO - 10.1016/j.ijsolstr.2018.12.025
PY - 2018///
SN - 0020-7683
TI - Investigating shock processes in bimodal powder compaction through modelling and experiment at the mesoscale
T2 - International Journal of Solids and Structures
UR - http://dx.doi.org/10.1016/j.ijsolstr.2018.12.025
UR - http://hdl.handle.net/10044/1/65429
ER -