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Shock compression and spallation of single crystal tantalum

An, Q. and Ravelo, R. and Germann, T. C. and Han, W. Z. and Luo, S. N. and Tonks, D. L. and Goddard, William A., III (2012) Shock compression and spallation of single crystal tantalum. In: 2011 Shock Compression of Condensed Matter. AIP Conference Proceedings. No.1426. American Institute of Physics , Melville, NY, pp. 1259-1262. ISBN 978-0-7354-1006-0. https://resolver.caltech.edu/CaltechAUTHORS:20120409-072731815

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Abstract

We present molecular dynamics simulations of shock-induced plasticity and spall damage in single crystal Ta described by a recently developed embedded-atom-method (EAM) potential and a volumedependent qEAM potential. We use impact or Hugoniotstat simulations to investigate the Hugoniots, deformation and spallation. Both EAM and qEAM are accurate in predicting, e.g., the Hugoniots and γ - surfaces. Deformation and spall damage are anisotropic for Ta single crystals. Our preliminary results show that twinning is dominant for [100] and [110] shock loading, and dislocation, for [111]. Spallation initiates with void nucleation at defective sites from remnant compressional deformation or tensile plasticity. Spall strength decreases with increasing shock strength, while its rate dependence remains to be explored.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.3686509DOIArticle
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.3686509PublisherArticle
ORCID:
AuthorORCID
An, Q.0000-0003-4838-6232
Goddard, William A., III0000-0003-0097-5716
Additional Information:© 2012 American Institute of Physics. We benefited from discussions with Y. Z. Tang. This work was supported by the LDRD and ASC programs at LANL, and the PSAAP project at Caltech.
Funders:
Funding AgencyGrant Number
Los Alamos National Laboratory (LANL)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:Spallation, twinning, dislocation, shock, bcc
Series Name:AIP Conference Proceedings
Issue or Number:1426
Classification Code:PACS: 62.50.Ef,61.72.-y
Record Number:CaltechAUTHORS:20120409-072731815
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120409-072731815
Official Citation:Shock compression and spallation of single crystal tantalum An, Qi and Ravelo, R. and Germann, T. C. and Han, W. Z. and Luo, Sheng-Nian N. and Tonks, D. L. and Goddard, III, W. A., AIP Conference Proceedings, 1426, 1259-1262 (2012), DOI:http://dx.doi.org/10.1063/1.3686509
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30025
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Apr 2012 21:47
Last Modified:03 Oct 2019 03:46

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