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Molecular dynamics study of the shock response of polyurea

Manav, M. and Ortiz, M. (2020) Molecular dynamics study of the shock response of polyurea. Polymer . ISSN 0032-3861. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20201012-103540350

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Abstract

We leverage the phase segregated microstructure of polyurea to study its shock response using molecular dynamics (MD) simulation. The two phase segregated domains, the hard and the soft domains, are investigated separately. The shock response of the domains is studied using a multiscale shock-simulation approach that allows simulation of shocks at low shock pressures. Both domains exhibit an unconventional behavior at low shock velocities that is typically associated with polymers. The shock response of the hard domain is marked by energy dissipation due to hydrogen bond breaking. Moreover, the radial distribution function suggests a severe distortion in the ring structure of aromatic moieties in the hard domain at high shock pressure. Finally, the shock Hugoniot of polyurea, obtained by combining the response of the two domains using a mixing rule, shows excellent match with experimental data.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.polymer.2020.123109DOIArticle
ORCID:
AuthorORCID
Ortiz, M.0000-0001-5877-4824
Additional Information:© 2020 Elsevier Ltd. Received 7 August 2020, Revised 23 September 2020, Accepted 30 September 2020, Available online 9 October 2020. We gratefully acknowledge support from the US Office of Naval Research, Naval Materials S&T Division, Dr. R. G. Barsoum manager, through grant N000141512453. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. The authors declare the following financial interests/personal relationships which may be considered as potential competing interests.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-15-1-2453
Subject Keywords:thermoplastic elastomers; polyuria; shock response; molecular dynamics
Record Number:CaltechAUTHORS:20201012-103540350
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201012-103540350
Official Citation:M. Manav, M. Ortiz, Molecular dynamics study of the shock response of polyurea, Polymer, 2020, 123109, ISSN 0032-3861, https://doi.org/10.1016/j.polymer.2020.123109. (http://www.sciencedirect.com/science/article/pii/S0032386120309344)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105979
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Oct 2020 17:40
Last Modified:12 Oct 2020 17:40

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