The effect of superimposed ultrasonic vibration on the primary creep of metals is modeled in terms of the synthetic theory of irrecoverable deformation. We consider two sonication modes: (i) the ultrasound acts continuously during the deformation, and (ii) the ultrasound is periodically on and off. Whereas both cases show a significant increase in primary creep, the periodical sonication leads to higher deformation values. To catch the phenomenon of ultrasound-assisted creep, we extend the flow rule equation by a term that accounts for the process occurring on the microlevel of material induced by ultrasound.
The present paper aims to model ultrasonic effects such as temporary softening and residual hardening. While temporary softening is observed during simultaneous action of mechanical forces and ultrasound, residual hardening manifests itself after switching off the ultrasound. The analytical description of these phenomena is conducted in terms of the synthetic theory of irrecoverable deformation. The model results show good agreement with experimental data obtained for the ultrasound-assisted compression of pure aluminum.
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