Effect Of Shot-peening On Fatigue And Fretting Fatigue Behaviour Of 8090 And 7010 Aluminum Alloys

Author:  Fair, Noble, Waterhouse
Source:  Conf Proc: ICSP-3, (p.431-438)
Doc ID:  1987021
Year of Publication:  1987
Abstract:  
Aluminium alloys are widely used in the aircraft industry for their favourable strength-weight ratios. A1-Zn-Mg alloys have been in use for many years, but recently alloys based on A1-Li have been developed with improved strength-weight ratios and it is thought that they may become widely used aircraft alloys in the 1990s. Generally, the fatigue strength of an alloy is simply related to the yield stress or tensile strength, although this relationship can be greatly influenced by the nature of the environment. The effects of fretting on fatigue are not so predictable and as fretting is a likely occurrence in an aircraft structure, it was thought relevant to investigate its effect on the recently developed A1-Li alloys. To date, little or no information is available on the fretting characteristics of A1-Li alloys. Furthermore, data is not available of the effect of shot peening these alloys, a process which is known to improve the fatigue properties and fretting fatigue properties of many alloy systems. The present work has therefore been concerned with the investigation of the fatigue and fretting fatigue characteristics of an A1-Li based alloy (8090) and, for comparison purposes, the investigation has included the more established A1-Zn-Mg-Cu alloy 7010.