Evaluation of the effect of strain hold time on nonprroportionlly combined axial/torsional fatigue life of SUS304 and 316LC steels

The present paper investigates whether or not the life prediction method proposed by the authors based on the strain range partitioning concept for SUS304 and 316LC steels subjected to nonproportionally combined push-pull and cyclic torsion under triangular strain waveforms can be used to explain the effect of strain hold time on nonproportionally combined axial/torsional fatigue life of both materials. The 90 deg out-of-phase straining axial/torsional fatigue tests were conducted on both materials using trapezoidal strain waveforms at 1023 K in air. The results were analyzed by the proposed method.