Improved Life Prediction of Turbine Engine Components

The proposed project will lead to a validated methodology for accurate life prediction of surface treated turbine engine components prone to fretting fatigue. The objective of this Phase I SBIR is to develop a modeling framework, and demonstrate itsfeasibility for further development in Phase II, by analyzing existing test data on fretting fatigue of surface treated laboratory specimens. In collaboration with Pratt & Whitney the need for a mechanistic methodology to characterize and predict frettingfatigue life of surface treated structural components has been identified. Once developed and validated, the methodology would enable prediction of the effect of redistribution of residual stresses on fretting fatigue life and on component distortions-issues important to useful remaining life predictions and prognostic health management. Furthermore, by quantifying the benefit, the methodology would enable more realistic cost-benefit analyses of surface treatment applications in current as well asfuture engines. By providing a unique modeling capability that allows combined consideration of fretting fatigue and surface treatment/residual stresses, the product will be readily marketable to aerospace propulsion and structures, automotive, energyproduction (e.g. land based gas and steam turbine engines) and other industries.