Abstract
This paper investigates the combined effect of corrosion and fatigue on the growth of cracks that arise from natural corrosion in steel bridges. It is shown that if these two effects need to be simultaneously analyzed. If not, then the resulting life is not conservative. Consequently, to enable a better understanding of the remaining life of structures this paper presents a simple methodology for performing this coupled analysis. The implication of this study to additively manufactured Ti-6Al-4V is also discussed.
Highlights
I t has long been known that the corrosion of steel bridges can have a marked effect on structural integrity
The need to be able to account for small sub mm initial defects is reinforced in the US Federal Highway Administration Steel Bridge Design Handbook [3] where it was noted that crack growth essentially starts from day one and that the majority of the life of steel bridges is consumed in growing to a size where a crack can be detected
We show that the interaction between fatigue crack growth and the stress increase created by corrosion induced section reduction needs to be considered when assessing the remaining life of an aged steel bridge
Summary
I t has long been known that the corrosion of steel bridges can have a marked effect on structural integrity. Steel bridges; Corrosion; Fatigue crack growth; Remaining life. The crack growth analysis uses the measured (worse case) steady state corrosion rate for the bridge and determines the appropriate K solution from a knowledge of the current crack length and the number of cycles, which are used to determine the amount of material that has been lost, by interpolating between these various solution spaces.
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