Fatigue data are usually derived from uninterrupted laboratory tests although the data may be required for conditions in which components are infrequently cycled. This paper discusses tests that involve rest periods to simulate infrequent cycling. The introduction of rest periods always causes an increase in endurance which approaches a maximum of approximately 100 per cent at a critical value of rest. The total rest period appears to be a more important parameter than either the number of rest periods or the position in the lifetime at which rests may be taken.
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