Refinement of a High Cycle Fatigue Decision-Gate Assessment for Additively Repaired Blades

Abstract

Abstract A recently developed high cycle fatigue (HCF) acceptance criteria demonstrates effectiveness in assessing the viability of two laser directed energy deposition (DED) repair processes on titanium 6Al-4V (Ti 6Al-4V) fan blades. The criteria demonstratively proved effective with basic coupon specimens; however, additional factors need to be considered to include available material or component information and nondestructive evaluation (NDE) conditional acceptance. The results from this study help define a prior rule (entrance statement) that identifies expected results based on manufacturing/microstructure information as well as a second-tier rule incorporating NDE for a more refined HCF acceptance criteria.