Abstract
The high-cycle fatigue life with respect to the multiaxial variable-stress amplitude was evaluated by applying the newly proposed total path length method for calculating the stress amplitude. Variable-stress-amplitude fatigue tests were conducted for verification based on the combined axial and torsional loads on AISI 4340 steel. The fatigue test load waveform denoted that the stress amplitude, mean stress, and load direction varied within one loop. The obtained lives were shorter than those predicted using the Wang–Brown method, longer than those predicted using the PDMR method, and comparable to those predicted using the total path length method.
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