An investigation of ultrasonic nanocrystal surface modification machining process by numerical simulation

Effect of ultrasonic nanocrystal surface modification on residual stress and fatigue cracking in engineering alloys

“…The larger diameter pin produced a wider impact area and larger plastic deformation of the target location in the material. The larger UNSM pin, owing to its higher mass, transfers more energy and produces larger deformation of the target surface …”

“…It has been found in these studies that the fatigue life improvement by UNSM depends on the elastic‐plastic properties of the target material and its microstructure. The UNSM pin diameter and impact force also affect the fatigue life improvement . The complex interaction of material properties and UNSM process parameters for fatigue improvement makes the selection of optimum parameters very challenging.…”

“…Finite element (FE) simulations of surface treatment processes have been used for investigations of the relationship between surface treatment process parameters and fatigue performance of engineering alloys . Experimental and FE studies of UNSM on hardening and residual stresses of various engineering alloys are still scarce …”

“…The UNSM pin diameter and impact force also affect the fatigue life improvement. [8][9][10] The complex interaction of material properties and UNSM process parameters for fatigue improvement makes the selection of optimum parameters very challenging. Different process parameters of UNSM produce different hardening and residual stresses, affecting the fatigue life of the material.…”

Investigations of ultrasonic frequency effects on surface deformation in rotary ultrasonic roller burnishing Ti-6Al-4V

“…The displacement of material has a great effect on the strain rate of material in the deformation zone [19], especially the variation of U1, which will influence the yield strength of material in this zone. It may be the reason that causes the variation of burnishing force in RURB compared with the one in CRRB.…”