Optimization of shot peening for titanium alloys Ti 10-2-3 in CONDOR project

^a IRT-M2P, 4 rue Augustin Fresnel 57000 Metz.
^b SAFRAN LANDING SYSTEMS, 9 Rue Guynemer, 64400 Bidos.
^c AIRBUS HELICOPTERS, Aéroport International Marseille-Provence 13725 Marignane Cedex.

Abstract

CONDOR is an R&D project lead by IRT-M2P with different industrial partnership to increase knowledge and simulation models of shot peening. This surface hardening process aims to perform different shots with high velocity on metallic surfaces to introduce compressive stresses on it. Fatigue behavior of shot peened parts is significantly improved. During this research project a DOE has been carried out to optimize shot peening parameters on titanium alloys (surface roughness before shot peening, size and shot’s hardness, covering and intensity). The DoE is composed by more than 300 fatigue specimens. All this data allows us to define specifically each shot peening parameter influence on shot penned parts efficiency. CONDOR project allows simulation development of models to simulate shot peening effect by taking into account the parameters introduced above. Those models are used to evaluate residual stress level and fatigue lifetime after shot peening and to confirm models readiness level. This study has defined optimized machining and shot peening conditions in order to increase parts fatigue lifetime.