Numerical analysis of shot peening effects on the fatigue life

Author:  H. Bae, M. Ramulu, B. Flinn and H. Diep
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 117-122)
Doc ID:  2011019
Year of Publication:  2011
Abstract:  
ABSTRACT The fatigue life of a mechanical component depends strongly on its surface layer conditions since crack initiation begins at or near the surface. Shot peening process enhances the fatigue life by increasing surface hardening and inducing compressive surface residual stress but with increasing surface roughness. The effects of surface roughness and surface hardening on the fatigue life of shot peened Ti 6Al-4V (Ti 64) were investigated. Stress concentration factor was calculated by using 2D and 3D Finite element analysis of measured surface roughness induced by shot peening. Stress concentration factor (SCF) calculation was compared with two analytical stress concentration calculation models. Using surface roughness parameters, this paper estimates fatigue life of Ti 64 specimens by using SCF in a fatigue life prediction model including surface roughness and micro-hardness effects.