Shot Peening Method for Aerofoil Treatment of Blisk Assemblies

Author:  W. Hennig, G. Feldmann, Th. Haubold
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.541-545)
Doc ID:  2014134
Year of Publication:  2014
Abstract:  
Todays advanced compressor designs often include blade integrated disc (blisk) rotors, with high demands on aerodynamic performance, resistance against high load levels and foreign object damage (FOD). To increase the high cycle fatigue (HCF) strength, compressive residual stresses are introduced into the surface and subsurface layer of aerofoil, fillet (transient area between aerofoil and disk) and annulus (intermediate area between aerofoils). For generating compressive residual stresses several different industrial production processes are used. Beside laser shock peening, ultrasonic peening, deep rolling and shot peening wet and dry with glass or ceramic media shot peening with steel media is the technology used most. However, depending on the size of the component accessibility might be limited and the set-up of economical production techniques can be challenging for blisk aerofoil shot peening.This paper gives an introduction into blisk aerofoil shot peening using specially designed caliper nozzles as a solution for introducing uniform residual compressive stress conditions as well as consistent shot peening coverage levels.