Micro-cutting force model of micro-jet induced by cavitation collapse in the ultrasonic field at micro-nano scale

The micro-jet is the main mechanism of cavitation on materials. More and more ultrasonic assisted machining uses effect in industrial field. In this paper, impact considered micro-cutting process. To deeply analyze micro-jet, size materials was considered, force model established solved based spherical indentation test theory strain gradient plasticity theory. results showed that pressure with are larger than those without single within 2.35 N. increases exponentially increase pit radius, but only slightly depth. When or not, 1616–2922 MPa 1615–1980 MPa, respectively. increased ratio $$\left(\sqrt{1+\frac{2{\overline{m} }^{2}{a}^{2}{G}^{2}bh}{\left({a}^{2}+{h}^{2}\right){\sigma }_{\mathrm{JC}}^{2}}-1}\right)\times 100\%$$ , which can directly reflect strength effect. obvious when smaller, maximum 47.54%. nonlinearly decrease radius It has a strong correlation This paper provide theoretical viewpoint support for quantitative description ultrasonic-assisted machining.