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Shock temperatures of preheated MgO

Fat'yanov, Oleg V. and Asimow, Paul D. and Ahrens, Thomas J. (2009) Shock temperatures of preheated MgO. In: Shock-induced spall in copper: The effects of anisotropy, temperature, defects and loading pulse. AIP Conference Proceedings. No.1195. American Institute of Physics , pp. 855-858. ISBN 978-0-7354-0732-9 . http://resolver.caltech.edu/CaltechAUTHORS:20100621-092634935

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Abstract

Shock temperature measurements via optical pyrometry are being conducted on <100> single-crystal MgO preheated before compression to 1905–1924 K. Planar shocks were generated by impacting hot Mo(driver plate)-MgO targets with Mo or Ta flyers launched by the Caltech two-stage light-gas gun up to 6.6 km/s. Quasi-brightness temperature was measured with 2–3% uncertainty by a 6-channel optical pyrometer with 3 ns time resolution, over 500–900 nm spectral range. A high-power, coiled irradiance standard lamp was adopted for spectral radiance calibration accurate to 5%. In our experiments, shock pressure in MgO ranged from 102 to 203 GPa and the corresponding temperature varied from 3.78 to 6.53 kK. For the same particle velocity, preheated MgO Hugoniot has about 3% lower shock velocity than the room temperature Hugoniot. Although model shock temperatures calculated for the solid phase exceeded our measurements by ~5 times the uncertainty, there was no clear evidence of MgO melting, up to the highest compression achieved.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.3295277 DOIUNSPECIFIED
http://link.aip.org/link/?APCPCS/1195/855/1PublisherUNSPECIFIED
ORCID:
AuthorORCID
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2009 American Institute of Physics. We thank M. Long, E. Gelle, and R. Oliver for valuable technical assistance. Funding was provided by the U.S. NSF, grant EAR-0810116.
Funders:
Funding AgencyGrant Number
NSFEAR-0810116
Subject Keywords:MgO; inductive heating; plate impact; fast optical pyrometry; equation of state; melting
Classification Code:PACS: 62.50.Ef; 07.20.Ka; 82.40.Fp
Record Number:CaltechAUTHORS:20100621-092634935
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100621-092634935
Official Citation:SHOCK TEMPERATURES OF PREHEATED MgO Oleg V. Fat'yanov, Paul D. Asimow, and Thomas J. Ahrens, AIP Conf. Proc. 1195, 855 (2009), DOI:10.1063/1.3295277
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18743
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Aug 2010 21:42
Last Modified:29 Jul 2014 18:16

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