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Deformation and rupture of stainless steel under cyclic torsional creep

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A life prediction method is advanced for when metallic alloys operate under combined creep-fatigue conditions. Low cycle fatigue tests conducted on stainless steel under reversed torsion revealed that a square root law prevails to extended durations of over a year. Thus, uncertainties involved when predicting cyclic service life by extrapolation from shorter-time data, have been obviated by the present procedure. This is the final paper among a number in which the conclusion is drawn that a t1/2 phenomenological law appears as a cyclic counterpart to the t1/3 law, much-used for representing the time-dependence of monotonic creep in metals and alloys.