Fatigue limits prediction of surface treated materials

Finite element modelling of shot peening process- A progress overview

“…In their work, a DE representation of shot was adopted and different contact interaction laws for shot-target collision were extensively studied with special attention given to the proper selection of the parameter values involved. Besides, the modelling of the residual stresses on crack propagation and on the stress relief during load service was also performed [42][43][44][45].…”

Assessment of surface hardening effects from shot peening on a Ni-based alloy using electron backscatter diffraction techniques

“…Despite numerous measurements of residual stress to assess the effects of shot peening, a recent study by Guechichi and Castex [14] provides evidence that strain hardening and not residual stress is the primary contributor to fatigue resistance. Such claims are enhanced if residual stress relaxation is considered, as shown by Evans et al [3], who demonstrate that one cycle of high temperature isothermal fatigue is enough to reduce residual stress levels in a nickel-based superalloy by more than 50 per cent.…”

Fatigue modelling for gas nitriding

“…The residual stresses and the increased hardness induced by nitriding are taken into account in the hysdrostatic pressure H P * and coefficient  [8,9]. The slope  of the straight line is calculated using fatigue properties of the non-nitrided material.…”