Influence of Shot Peening Coverage on Residual stresses Induced in Aluminum Alloy 7050-T745

Author:  H. Bae, H. Diep and M. Ramulu
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.282-287)
Doc ID:  2014090
Year of Publication:  2014
Abstract:  
Experimental investigation was conducted to study the residual stresses in aluminum alloy 7050-T745. A vacuum-blasting system from Vacublast was employed for this study. A 6 mm diameter nozzle and cast steel shots (S230) were used for the system. Type A Almen strips were used for Almen intensity measurements. Aluminum alloy 7050-T7451 blocks (100 mm X 100 mm) were used for shot peening coverage. Micro-hardness measurements were made and hole drilling techniques were used to measure the residual stresses on Al 7050-T745 specimens peened at four levels of coverage. This paper presents the results of experimental and anlytically estimated compressive residual stresses, which includes intensity and coverage effects.