Acoustic emission from fast dislocations in 3d bcc iron crystals

0497953 - ÚT 2019 RIV CZ eng A - Abstrakt
Hora, Petr - Machová, Anna - Červ, Jan - Uhnáková, Alena
Acoustic emission from fast dislocations in 3d bcc iron crystals.
Advanced Modelling of Wave Propagation in Solids. Praha: Institute of Thermomechanics, Czech Academy of Sciences, 2018 - (Kolman, R.; Berezovski, A.; Kruisová, A.). s. 59. ISBN 978-80-87012-67-3.
[International Conference on Advanced Modelling of Wave Propagation in Solids /2./. 17.09.2018-21.09.2018, Praha]
Grant CEP: GA MŠk(CZ) EF15_003/0000493; GA ČR(CZ) GA17-22615S; GA ČR GA17-12925S
Institucionální podpora: RVO:61388998
Klíčová slova: acoustic emission * dislocations * molecular dynamics
Obor OECD: Materials engineering
http://wavemodelling2018.it.cas.cz

Acoustic emission and kinetics of dislocations emitted from a crack is studied via molecular dynamics (MD) utilizing nonlinear interatomic forces, [1] and [2]. 3D results indicate that edge dislocation segments in the middle of the crystal at the free sample surface can accelerate. The dislocations in MD penetrate the free surface in transonic or supersonic regime. Possible sources for such behaviour are discussed in the framework of continuum models. MD results comply with recent continuum analysis [3] of surface waves in anisotropic medium where supersonic regime of wave propagation at the free surface can exist unlike isotropic continuum.
Trvalý link: http://hdl.handle.net/11104/0291656