Author(s)

N. Glinos, RG. Wagstaff & R. Cook

Abstract

The effects of surface corrosion on the fatigue behaviour of aluminium alloy specimens containing cold expanded holes N. Glinos,* RG. Wagstaff," R. Cook" "Aeronautical Engineering, Kingston University, Kingston-Upon- Thames, Surrey, UK ^Defence Research Agency, Farnborough, Hampshire GUI 4 6TD, ABSTRACT The purpose of this work was to determine the influence of prior surface corrosion on the fatigue life improvement produced by cold expansion of fastener holes in an aluminium alloy. Results for corroded and uncorroded material are presented and the effects of cold expansion on fatigue endurance and crack propagation rates are evaluated. INTRODUCTION Fatigue damage is one of the most important problems in aircraft structures particularly in structural joints, where cracks frequently initiate at fastener holes. Significant improvements in the fatigue life of joints can be achieved by hole cold expansion which introduces residual compressive hoop stresses around the circumference of

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