TY - JOUR
T1 - Analysis of hypervelocity impacts: the tungsten case
AU - Fraile, Alberto
AU - Dwivedi, Prashant
AU - Bonny, Giovanni
AU - Polcar, Tomas
N1 - Score=10
PY - 2022/1/5
Y1 - 2022/1/5
N2 - The atomistic mechanisms of damage initiation during high velocity (v up to 9 km s−1, kinetic energies up to 200 keV) impacts of W projectiles on a W surface have been investigated using parallel molecular-dynamics simulations involving large samples (up to 40 million atoms). Various aspects of the high velocity impacts, where the projectile and part of the target material undergo massive plastic deformation, breakup, melting, and vaporization, are analyzed. Different stages of the penetration process have been identified through a detailed examination of implantation, crater size and volume, sputtered atoms, and dislocations created by the impacts. The crater volume increases linearly with the kinetic energy for a given impactor; and the total dislocation length (TDL) increases with the kinetic energy but depends on the size of the impactor. We found that the TDL does not depend on the used interatomic potential. The results are rationalized based on the physical properties of bcc W.
AB - The atomistic mechanisms of damage initiation during high velocity (v up to 9 km s−1, kinetic energies up to 200 keV) impacts of W projectiles on a W surface have been investigated using parallel molecular-dynamics simulations involving large samples (up to 40 million atoms). Various aspects of the high velocity impacts, where the projectile and part of the target material undergo massive plastic deformation, breakup, melting, and vaporization, are analyzed. Different stages of the penetration process have been identified through a detailed examination of implantation, crater size and volume, sputtered atoms, and dislocations created by the impacts. The crater volume increases linearly with the kinetic energy for a given impactor; and the total dislocation length (TDL) increases with the kinetic energy but depends on the size of the impactor. We found that the TDL does not depend on the used interatomic potential. The results are rationalized based on the physical properties of bcc W.
KW - Tungsten
KW - Plasma facing materials
KW - Hypervelocity impacts
UR - https://ecm.sckcen.be/OTCS/llisapi.dll/overview/52159268
U2 - 10.1088/1741-4326/ac42f6
DO - 10.1088/1741-4326/ac42f6
M3 - Article
SN - 0029-5515
VL - 62
JO - Nuclear Fusion
JF - Nuclear Fusion
M1 - 026034
ER -