Acoustic emission from a dislocation kink accelerated by an external force

• Autorzy: Douka E. , Polyzos B. , Trochidis A.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

acoustic emission; dislocations dynamics; nonlinear waves

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2005
• Tom: Vol. 30, No. 2
• Strony: 247--253
• Opis fizyczny: Bibliogr. 7 poz., rys., wykr.

Twórcy

autor

Douka E.

• University of Thessaloniki, School of Engineering, Mechanics Division, Thessaloniki 54124, Greece

autor

Polyzos B.

• University of Thessaloniki, School of Engineering, Physics Division, Thessaloniki 54124, Greece

autor

Trochidis A.

• University of Thessaloniki, School of Engineering, Physics Division, Thessaloniki 54124, Greece

Bibliografia

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• [2] FLEISHMANN P., LAKESTANI F., ROUBY D., Spectral and energy analysis of moving ultrasonic source-application to AE of aluminum under plastic deformation, Mater. Sci. Engng., 29, 205–212 (1977).
• [3] FLEISHMANN P., ROUBY D., Spectral analysis of AE from aluminum single-crystals undergoing plastic deformation, Phys. Stat. Sol. (a), 48, 439–445 (1978).
• [4] SCHAARWACHTER W., EBENER H., Acoustic emission a probe into dislocation dynamics in plasticity, Acta Metall. Matter., 38, 195–205 (1990).
• [5] POLYZOS B., TROCHIDIS A., Dislocation dynamics and acoustic emission during plastic deformation of crystals, Wave Motion, 21, 343–355 (1995).
• [6] A. PAWELEK, Possibility of soliton description of AE during plastic deformation of crystals, J. Appl. Phys., 63, 5320–5325 (1988).
• [7] KIVSHAR Y., MALOMED B. A., Dynamics of solitons in nearly integrable systems, Rev. Mod. Phys., 61, 673–915 (1989).