TY - JOUR
T1 - Grain refinement under high strain rate impact: A numerical approach
AU - Lemiale, Vincent Jerome
AU - Estrin, Yuri
AU - Kim, Hyoung Seop
AU - O'donnell, Robert
PY - 2010
Y1 - 2010
N2 - In this paper, the mechanical response of ultra fine grained metallic materials under high strain rate impact conditions is investigated by means of a finite element based numerical framework. A dislocation based viscoplastic model is used to predict the evolution of the initial fine grain microstructure (average grain size of 203 nm or 238 run, depending on the material history) with impact deformation. A Taylor impact test is simulated in order to assess the validity of a numerical solution through comparison with experiment. It is shown that our model captures the essential features of the mechanical behaviour. A further grain refinement down to the average grain size of 140-160 nm is predicted by the simulations.
AB - In this paper, the mechanical response of ultra fine grained metallic materials under high strain rate impact conditions is investigated by means of a finite element based numerical framework. A dislocation based viscoplastic model is used to predict the evolution of the initial fine grain microstructure (average grain size of 203 nm or 238 run, depending on the material history) with impact deformation. A Taylor impact test is simulated in order to assess the validity of a numerical solution through comparison with experiment. It is shown that our model captures the essential features of the mechanical behaviour. A further grain refinement down to the average grain size of 140-160 nm is predicted by the simulations.
UR - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TWM-4Y8G1KB-1-1W&_cdi=5566&_user=542840&_pii=S0927025609004765&_origin=search&_coverDate=03%
U2 - 10.1016/j.commatsci.2009.12.018
DO - 10.1016/j.commatsci.2009.12.018
M3 - Article
SN - 0927-0256
VL - 48
SP - 124
EP - 132
JO - Computational Materials Science
JF - Computational Materials Science
IS - 1
ER -