Abstract
1. During fatigue tests, the loading frequency exerts a marked effect on the overall longevity-the average increase in cycles to failure at all levels of nominal stress was about 60% with an increase in cycle frequency from 260 to 1000 cycles/min. 2. The loading frequency also affects the rate of fatigue-macrocrack propagation, particularly at the outset of crack propagation. The rate of crack propagation diminishes with increasing loading frequency. 3. In the step function vcr=CΔKn describing the relationship between the rate of crack propagation and the stress-concentration factor, the parameters C and n are dependent on loading frequency. The coefficient C diminishes, and the value of n increases with increasing loading frequency; in this case, the intensity of the relationship vcr=f(ΔK) also increases. 4. The parameters C and n are linear functions of the level of applied stress; in this case, the loading frequency does not affect the intensity of this relationship.
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