LAUSR

Experimental and numerical studies have been carried out to determine the residual stress in Ti-6Al-4V after Ultrasonic Peening Treatment (UPT). Ultrasonic vibration output from the test equipment transducer was employed as the load to simulate the test conditions and the residual compressive stress in the material was measured by X-ray diffraction (XRD). A Johnson-Cook constitutive model was used to describe the rate-dependent stress-strain and failure behaviour of a sample. Based on motion analysis of the peening needle, a new 3D peen-rebound-peen (PRP) finite element model was developed to predict the stress field during and after the UPT process, using ABAQUS. The residual stresses predicted by the PRP model are in good agreement with the XRD results for the same peening and sample conditions. The effect of the gap width between the needle and the sample, the constitutive model parameters, and the peening duration were also studied.