Imperial College London

Dr Gareth Collins

Faculty of EngineeringDepartment of Earth Science & Engineering

Reader in 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{Davison,
author = {Davison, TM and Derrick, JG and Collins, GS and Bland, PA and Rutherford, ME and Chapman, DJ and Eakins, DE},
journal = {Procedia Engineering},
title = {Impact-induced compaction of primitive solar system solids: The need for mesoscale modelling and experiments},
url = {http://hdl.handle.net/10044/1/48992},
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Primitive solar system solids were accreted as highly porous bimodal mixtures of mm-sized chondrules and sub-μm matrix grains. To understand the compaction and lithification of these materials by shock, it is necessary to investigate the process at the mesoscale; i.e., the scale of individual chondrules. Here we document simulations of hypervelocity compaction of primitive materials using the iSALE shock physics model. We compare the numerical methods employed here with shock compaction experiments involving bimodal mixtures of glass beads and silica powder and find good agreement in bulk material response between the experiments and models. The heterogeneous response to shock of bimodal porous mixtures with a composition more appropriate for primitive solids was subsequently investigated: strong temperature dichotomies between the chondrules and matrix were observed (non-porous chondrules remained largely cold, while the porous matrix saw temperature increases of 100’s K). Matrix compaction was heterogeneous, and post-shock porosity was found to be lower on the lee-side of chondrules. The strain in the matrix was shown to be higher near the chondrule rims, in agreement with observations from meteorites. Chondrule flattening in the direction of the shock increases with increasing impact velocity, with flattened chondrules oriented with their semi-minor axis parallel to the shock direction.
AU - Davison,TM
AU - Derrick,JG
AU - Collins,GS
AU - Bland,PA
AU - Rutherford,ME
AU - Chapman,DJ
AU - Eakins,DE
SN - 1877-7058
TI - Impact-induced compaction of primitive solar system solids: The need for mesoscale modelling and experiments
T2 - Procedia Engineering
UR - http://hdl.handle.net/10044/1/48992
ER -