Large scale molecular dynamics (MD) simulations are carried out to investigate the wave propagation and failure behavior of single crystal Mg under shock loading conditions. The embedded atom method interatomic potential, used to model the Mg systems, is first validated by comparing the predicted Hugoniot behavior with that observed using experiments. The first simulations are carried out to investigate the effect of loading orientation on the wave propagation and failure behavior by shock loading the system along the [0001] direction (c-axis) and the direction using a piston velocity of 1500βm/s. The spall strength (peak tensile pressure prior to failure) is predicted to be higher for loading along the direction than that predicted for loading along the [0001] direction. To investigate the effect of shock pressure on the failure behavior and spall strength of the metal, the MD simulations are carried out using piston velocities of 500βm/s, 1000βm/s, 1500βm/s, and 2000βm/s for loading along the c-axis. The results indicate that the higher piston velocities result in higher shock pressures, and the predicted values for the spall strength decrease with an increase in the shock pressure. In addition, the simulations reveal that the various piston velocities result in variations in the interactions between the reflected waves and the tail of the pressure waves and, hence, variations in the failure behavior. In addition, MD simulations are also carried out to investigate the effect of temperature on the wave propagation behavior and spall strength by equilibrating the initial system at temperatures of 300βK, 600βK, and 800βK prior to shock loading simulations using a piston velocity of 1000βm/s. The results suggest a decrease in spall strength of the single crystal metal with an increase in the initial temperature of the system. The strain rates generated, the evolution of temperature, the variations in the wave interactions, and the spall strength computed using MD simulations are discussed and compared to experimental results in the literature.
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14 April 2016
Research Article|
April 08 2016
Shock wave propagation and spall failure in single crystal Mg at atomic scales
Garvit Agarwal;
Garvit Agarwal
Department of Materials Science and Engineering, and Institute of Materials Science,
University of Connecticut
, Storrs, Connecticut 06269, USA
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Avinash M. Dongare
Avinash M. Dongare
a)
Department of Materials Science and Engineering, and Institute of Materials Science,
University of Connecticut
, Storrs, Connecticut 06269, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: dongare@uconn.edu
J. Appl. Phys. 119, 145901 (2016)
Article history
Received:
December 29 2015
Accepted:
March 12 2016
Citation
Garvit Agarwal, Avinash M. Dongare; Shock wave propagation and spall failure in single crystal Mg at atomic scales. J. Appl. Phys. 14 April 2016; 119 (14): 145901. https://doi.org/10.1063/1.4944942
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