Shock compression and spallation of single crystal tantalum.
Qi An, R. Ravelo, Timothy C. Germann, W. Z. Han, Sheng-Nian Luo, David L. Tonks, William A. Goddard III
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.
Group Members
An, Q., Ravelo, R., Germann, T. C., Han, W. Z., Luo, S., Tonks, D. L., & III, W. A. G. (2012). Shock compression and spallation of single crystal tantalum.. *2011 Shock Compression of Condensed Matter , M.L. Elert, Ed. American Institute of Physics,pp.1259–1262*. https://doi.org/10.1063/1.3686509