Hydrocode modelling of hypervelocity impacts on ice

Fendyke, S., Price, Mark C., Burchell, Mark J. (2013) Hydrocode modelling of hypervelocity impacts on ice. Advances in Space Research, 52 (4). pp. 705-714. ISSN 0273-1177. (doi:10.1016/j.asr.2013.04.010) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1016/j.asr.2013.04.010

Abstract

Experimental data are now widely available for the size of craters resulting from hypervelocity impacts of millimetre scale projectiles onto water ice targets. At such size scales the bowl shaped crater formed in ductile materials, or in larger scale impacts, is here surrounded by a large spallation zone due to the brittle nature of the ice. Modelling of these impacts therefore has to take account of this spallation. Here we used the iSALE2 hydrocode to simulate such impacts and compared the results to experimental data. We found that it was possible to reproduce the experimental data over a range of speeds (1–7 km s−1) for aluminium and copper projectiles. Initially, to reproduce the large spallation regions around the craters it was assumed that above a certain degree of damage, material was removed by spallation. However this simple one-parameter model failed to model the crater depth adequately. Accordingly, to obtain the best agreement of the simulations with the experimental data, a two-step ice strength was introduced, whereby above a critical amount of damage (0.95), the yield strength reduced from 1 MPa (intact) to 70 kPa (damaged). As a result, experimental data for crater depth and diameter and the results of the simulations agree to within 6% for diameter and 5% for depth over the impact energy range used in the experiments (1–240 J).

Item Type: Article
DOI/Identification number: 10.1016/j.asr.2013.04.010
Uncontrolled keywords: Ice; Hypervelocity; Crater; Hydrocode; Impact
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Mark Burchell
Date Deposited: 11 Nov 2013 15:29 UTC
Last Modified: 19 Jun 2019 08:14 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/36158 (The current URI for this page, for reference purposes)
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