Abstract
The fatigue properties of 1100 aluminum in reverse bending were studied at vacuum levels varying from 10 −7 torr to atmospheric pressure. A substantial increase up to ten-fold in fatigue life was observed at pressures below 10 −2 torr which could be related to retardation of the crack propagation phase of the fatigue process. The increase in fatigue resistance was attributed to the related kinetics of residual O 2 and H 2O gas adsorption at crack surfaces and fatigue crack growth. Changes in the fatigue life and transition pressure effect with varying cyclic stress frequency and bend stress amplitude were interpreted in terms of the interaction between crack propagation and gas adsorption rates.
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