FEM simulation and experimental validation of a non destructive technique applied to rolling bodies. In this thesis nondestructive methods for the characterization of surface cracks in rolling components using ultrasonic Rayleigh waves are discussed. Rayleigh waves propagate near the free boundary of a solid. As the energy associated with the Surface Acoustic Waves is concentrated in a small layer in the vicinity of the surface they are particularly sensitive to surface discontinuities. Furthermore, Rayleigh waves follow complex curvatures and consequently, often provide insight into defect areas that are inaccessible to other wave forms. Nondestructive testing using Rayleigh waves is therefore a promising technique for the inspection of components such as ball bearings and other rolling bodies, where cracks are expected to form on the surface of the component.