Ultrasonically assisted turning (UAT) is a novel machining technique, where high-frequency vibration is superimposed on the movement of a cutting tool. This technique allows significant improvements in processing intractable materials. This thesis reports research into the development of a coupled thermomechanical 3D finite element model of UAT. In the case of UAT high-frequency vibrations are introduced in the cutting tool and it is important to use techniques capable of recording this fast movement of the cutting tool and its impact on both the workpiece and cutting tool. High speed (HS) filming is performed to study the chip formation, development of different shear zones and the material's response to different vibrations. Nanoindentation studies are performed to get an insight into the development of a hardness zone near the machined surface in the workpiece.