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Modelling radially symmetric impact craters with Zernike polynomials

Wallis, D., Solomon, Christopher J., Kearsley, Anton T., Graham, Giles A., McBride, Neil (2002) Modelling radially symmetric impact craters with Zernike polynomials. International Journal of Impact Engineering, 27 (4). pp. 433-457. ISSN 0734-743X. (doi:10.1016/S0734-743X(01)00148-8) (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)

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. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1016/S0734-743X(01)00148-8

Abstract

Crater morphology in a ductile target can reveal some properties of the impacting particle. Simple measurements alone, such as the crater depth and diameter are limited in potential because the complete morphology is not considered. Detailed shape measurements, made by comparing stereo Scanning Electron Micrographs, can be reduced to a parameter set based on an orthogonal expansion over a circular domain, allowing quantitative comparisons between craters that consider the complete morphology. Most high-velocity impact craters are circular (have a circular rim), enabling us to make a model using only the radially symmetric terms from the orthogonal functions set. Shape parameters can be plotted on a feature space diagram, where similar shaped craters form clusters which can be analysed statistically. The method has been applied to laboratory impacts using a two-stage light-gas gun to fire mineral grains at an aluminium alloy target and glass beads over the velocity range 1-6 km s-1. The minerals kamacite and enstatite can be distinguished from crater morphology by this method and we have shown that the shape of impact craters change over the velocity range 1-6 km s-1 as well as simply the depth to diameter ratio. © 2002 Published by Elsevier Science Ltd.

Item Type: Article
DOI/Identification number: 10.1016/S0734-743X(01)00148-8
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Int J Impact Eng [Field not mapped to EPrints] AD - Unit for Space Sciences and Astrophysics, School of Physical Sciences, University of Kent at Canterbury, Canterbury CT2 7NR, United Kingdom [Field not mapped to EPrints] AD - Applied Optics Group, School of Physical Sciences, University of Kent at Canterbury, Canterbury CT2 7NR, United Kingdom [Field not mapped to EPrints] AD - Geology, Oxford Brookes University, Headington, Oxford OX3 OBP, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Impact crater, Morphology, Orthogonal expansion, Radially symmetric, Zernike polynomials, Aluminum alloys, Computer simulation, Polynomials, Scanning electron microscopy, Statistical methods, Impact craters, Meteor impacts
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Forensic Imaging Group
Depositing User: Giles Tarver
Date Deposited: 21 May 2015 10:13 UTC
Last Modified: 29 May 2019 14:34 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/48548 (The current URI for this page, for reference purposes)
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