Evaluation of corrosion resistance of aluminum alloy under consecutive dynamic and VHCF regime

Abstract

An experimental and theoretical study of fracture mechanisms of the AMg6 alloy at different structural levels was carried out under consecutive dynamic and fatigue tests associated with conventional catastrophic events of aircraft engine components (fan blades) due to the foreign object damage and the life-time decrease in the presence of a corrosive environment. The AMg6 alloy samples were preloaded dynamically using the split Hopkinson-Kolsky bar at the strain rates ~103 s-1 and then subjected to the VHCF test up to 108-109 cycles at the Shimadzu USF-2000 resonance testing machine (the load frequency is 20 kHz) with the cooling by abundant compressed-air and salt fog (3% NaCl). The scaling analysis of fracture surface roughness was conducted to characterize quantitatively specific areas associated with the stages of damage-failure transition in the presence of the corrosion.