Rejuvenation of Aging Aircraft Components by Controlled Shot Peening

Author:  John Eckersley and Roger Thompson
Source:  Metal Improvement Company
Doc ID:  1991089
Year of Publication:  1991
Abstract:  
Aircraft Component design engineers are very well aware of the bene fits of surface residual compressive stresses on new parts as a means of retarding or even preventing ctastrophic failures from fatigue, fretting fatigue, corrosion fatigue and stress corosion cracking. Each of these failure modes depends on the presence of surface tensile stresses either residual or applied but, i service, usually both. It has been common practice, on parts for jet engines, propellers and landing gear, to reintroduce surface compressive stresses at overhaul intervals. Thousands of such parts are shot peened every day for rejuvenation purposes.