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Gel electrode imaging of metal fatigue: Part ii. deformation in 1100 Aluminum
Authors:W. J. Baxter
Affiliation:(1) Physics Department, General Motors Research Laboratories, 48090-9055 Warren, MI
Abstract:During the early stages of metal fatigue, the accumulation of damage produces microcracks in the surface oxide film. This process was first measured quantitatively by the exoelectron method. This paper describes a new and much simpler electrochemical technique, which can also detect microcracks in surface oxide films and provide quantitative information on the distribution and severity of fatigue damage. In these experiments the specimens are coated initially with thin (14 nm) anodic oxide films. After fatigue cycling, a semisolid electrolyte is placed in contact with the specimen, and the flow of current to the microcracks in the anodic oxide is measured. The distribution of fatigue deformation which accumulates prior to the appearance of a fatigue crack is easily measured, and in this regard the sensitivity of the technique is shown to exceed that of a scanning electron microscope. Fatigue deformation in 1100 aluminum is detected as early as 1 pct of the fatigue life, and the electrochemical current flow increases systematically with fatigue cycling as the density of microcracks in the oxide increases. The charge flow can therefore be used to predict the remaining fatigue life.
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