Cumulative Fatigue Damage under a Symmetrical-Sawtooth Loading Programme

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Abstract
A description is given of a modified rotating-bending fatigue machine which enables specimens to be submitted to repeated stress cycles modulated by a symmetrical-sawtooth wave, i.e. to a triangular stress block. Results are given of tests on plain and sharply notched mild-steel specimens and are discussed with reference to some existing concepts of fatigue damage accumulation. It is shown that, for mild steel, a hypothesis which neglects stress cycles having an amplitude of less than the fatigue limit of the material gives an optimistic prediction of specimen life but that to neglect cycles of amplitude less than 80 per cent of the fatigue limit gives results which agree closely with experiment.

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