It is important to predict the fatigue lives and endurance limits of metals under service loads, i. e., complex stress histories. Although the modified Miner's law has been applied sometimes to predict the fatigue lives of metals under service loads in general, it is not adequate to do so accurately and can not predict the endurance limits under service loads. In the present study, a new prediction method for fatigue lives and endurance limits of metals under service loads was developed.

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... ts. Then the fatigue lives of metals N under service loads can be predicted by solving the curve. The fatigue lives of 0.11% C rimmed steel under programmed loading which included stresses lower than the fatigue endurance limit, were predicted by applying the new prediction methods. from the test results through S-N curves was proposed. It was found that the predicted fatigue lives are in good agreement with the tested lives, when the adequate values of m and p are applied.