Archives of Acoustics, 30, 2, pp. , 2005

Acoustic emission from a dislocation kink accelerated by an external force

E. Douka
University of Thessaloniki, School of Engineering, Mechanics Division

B. Polyzos
University of Thessaloniki, School of Engineering, Physics Division

A. Trochidis
University of Thessaloniki, School of Engineering, Physics Division

The emission of elastic waves from a dislocation kink
accelerated by a constant external force is presented. The dynamics of the
dislocation kink interacting with longitudinal acoustic waves is described by a
sine-Gordon--d'Alembert system, i.e. a sine-Gordon equation nonlinearly coupled
with the d'Alembert wave equation. Within the framework of this model, the
evolution of velocity of the dislocation kink altered by the applied force is
determined, allowing for mechanical couplings. The total energy radiated from
the dislocation kink and its spectral composition is calculated numerically and
analytically. Computer simulations are presented, which graphically illustrate
the analytical considerations and model the acoustic radiation. Key words:
acoustic emission, dislocations dynamics, nonlinear waves.
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