Abstract
The frequency modified Coffin-Manson low cycle fatigue expression phenomenologically describes the influence of the cycling frequency on the fatigue life. This expression relates only to the fatigue life and as such does not enable the separation of the frequency influence on crack nucleation from that on propagation. The approach taken here was to study directly the propagation phase of low cycle fatigue and to this end a frequency modified crack growth expression is presented. The experiments reported here were performed on A286 (an iron-base superalloy) cycled at 1100°F with plastic strain limits. The influence of the cycling frequency is described in terms of two frequency regimes. At the lowest frequencies (below 0.05 cpm) varying the frequency did not change the time to failure. The crack growth rate is thus more a result of stress rupture than fatigue. At higher frequencies both time and cycles determine the crack propagation behavior.
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Solomon, H.D. Frequency dependent low cycle fatigue crack propagation. Metall Trans 4, 341–347 (1973). https://doi.org/10.1007/BF02649635
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DOI: https://doi.org/10.1007/BF02649635