Ultrasound-assisted creep deformation of metals

Abstract

This paper aims to develop a mathematical model to calculate the creep deformation of metals in the ultrasonic field. Experimental data recording that acoustic energy leads to an increase of primary and secondary creep has become the impetus for this research. The model is constructed in terms of the synthetic theory of irrecoverable deformation. To catch the phenomena caused by sonication, we introduce a new term reflecting the nucleation and development of the crystalline grid's defects in the ultrasonic field. By inserting this term into the basic relationships of the synthetic theory that define the deformation state of the material, we have derived the formulae describing the development of time-dependent deformation coupled with ultrasound. As a result, since the analytic solutions fit good the experimental data, we have elaborated an analytical instrument to predict the increase in the creep deformation of metals due to acoustic energy.

Keywords

• ultrasonic softening
• creep deformation
• synthetic theory