Abstract
The effect of vacuum on the fatigue life of aluminum under a constant stress cyclic bending deformation has been studied. Specimens made of commercially pure polycrystalline aluminum, cycled at two frequencies, 49 and 76 c/s, were tested at 9700 psi and 11700 psi at 50°C as a function of pressure. It was found that the fatigue life was not only dependent upon the testing pressure, but it also became frequency dependent in vacuum. A model based on the concept of the surface “debris” layer is proposed to account for the observations obtained in this study.
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