[Kovove materialy - Metallic materials]
    Fri - April 12, 2024 - 22:32 No. of hits : 1740511 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 57 (2019), Issue 2

Kinetics of dislocation emission in 3D: from the crack toward the free surface
HORA, P., MACHOVÁ, A., ČERV, J., UHNÁKOVÁ, A.
vol. 57 (2019), no. 2, pp. 75 - 93
DOI: 10.4149/km_2019_2_75

Abstract
The kinetics of dislocations emitted from a crack is studied via molecular dynamics (MD) in a 3D bcc iron crystal. The atomistic results show that edge dislocation segments in the middle of the crystal accelerate at the nearest vicinity of the free crystal surface. The dislocations in MD penetrate the surface layers in transonic or supersonic regimes. The possible sources for such behavior are discussed in the framework of continuum models and using stress calculations on the atomistic level. Acoustic emission patterns arising from the fast dislocation motion in MD are visualized via the local kinetic energies of individual atoms and further modeled as a moving source of the stress waves in the anisotropic continuum.

Key words
edge crack, dislocation emission, free surface, acoustic emission, bcc iron

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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