Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T24: Matter at Extreme Conditions: Carbon and Related Materials
11:30 AM–2:18 PM,
Thursday, March 17, 2022
Room: McCormick Place W-186C
Sponsoring
Unit:
GSCCM
Chair: Romain Perriot, Los Alamos National Laboratory
Abstract: T24.00004 : Proposing a new model for ramp compression from ab initio calculations*
12:30 PM–12:42 PM
Presenter:
Felipe J Gonzalez
(University of California, Berkeley)
Authors:
Felipe J Gonzalez
(University of California, Berkeley)
Budhiram K Godwal
(University of California, Berkeley)
Kevin P Driver
(Lawrence Livermore Natl Lab)
Raymond Jeanloz
(University of California, Berkeley)
Burkhard Militzer
(University of California, Berkeley)
anvil cells, or by dynamic shock and ramp compression experiments. While shock
compression is relatively well understood and described by the formalism of the Hugoniot
equations, no such formalism exists for ramp compression. The compression is thought to
be quasi-isentropic, leading to lower temperatures than shock compression, but there are
currently no measurements of temperature during ramp compression or a theoretical
framework to derive how much heating occurs. In this work, we present a model of ramp
compression that is based on thermodynamics and ab initio calculations where we
approximate ramp loading as a series of compression and relaxation steps. We apply our
model to diamond and we compare our predictions with the measured stress-density
relations reported from experiments [1-3]. We find good agreement between our model and
a multishock Hugoniot scheme, as well as with a recently proposed strength model for
diamond based on plastic work [4].
References:
[1] D. Bradley et al., PRL 102, 075503 (2009).
[2] R. Smith et al., Nature 511, 330 (2014).
[3] A. Lazicki et al., Nature 589, 532 (2021).
[4] D.C. Swift et al., arXiv 2004.03071 (2020).
*This work was in part supported by the National Science Foundation-Department of Energy (DOE) partnership for plasma science and engineering (Grant No. DE-SC0016248), by the DOE-National Nuclear Security Administration (Grant No. DE-NA0003842), and the University of California Labo- ratory Fees Research Program (Grant No. LFR-17-449059). This work was also performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. This research used computational resources of the National En- ergy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Sci- ence of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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