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Analysis of hypervelocity impacts: the tungsten case

Analysis of hypervelocity impacts: the tungsten case
Analysis of hypervelocity impacts: the tungsten case

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.

hypervelocity impacts, plasma facing materials, tungsten
0029-5515
Fraile, Alberto
a5360fc0-5002-4410-85fc-d0af55e36b8a
Dwivedi, Prashant
031772b9-3d8f-4a6e-84da-79eaac250757
Bonny, Giovanni
06f17321-fede-4521-9b6f-aa509416cc52
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Fraile, Alberto
a5360fc0-5002-4410-85fc-d0af55e36b8a
Dwivedi, Prashant
031772b9-3d8f-4a6e-84da-79eaac250757
Bonny, Giovanni
06f17321-fede-4521-9b6f-aa509416cc52
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2

Fraile, Alberto, Dwivedi, Prashant, Bonny, Giovanni and Polcar, Tomas (2022) Analysis of hypervelocity impacts: the tungsten case. Nuclear Fusion, 62 (2), [026034]. (doi:10.1088/1741-4326/ac42f6).

Record type: Article

Abstract

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.

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More information

Accepted/In Press date: 14 December 2021
e-pub ahead of print date: 5 January 2022
Published date: 1 February 2022
Keywords: hypervelocity impacts, plasma facing materials, tungsten

Identifiers

Local EPrints ID: 454787
URI: http://eprints.soton.ac.uk/id/eprint/454787
ISSN: 0029-5515
PURE UUID: f4d0b050-0d8d-409f-bd58-648f1a6eb975
ORCID for Tomas Polcar: ORCID iD orcid.org/0000-0002-0863-6287

Catalogue record

Date deposited: 23 Feb 2022 17:38
Last modified: 17 Mar 2024 03:26

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Contributors

Author: Alberto Fraile
Author: Prashant Dwivedi
Author: Giovanni Bonny
Author: Tomas Polcar ORCID iD

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