Abstract
A method which has evolved in our laboratories for the past 20 years is re-examined with the intent of improving its accuracy and simplicity of application to engineering problems. Several modifications are introduced both to the analytical formulation of the damage curve approach, and to the procedure for modifying this approach to achieve a double-linear damage rule formulation which immensely simplifies the calculation. Improvements are also introduced in the treatment of mean stress for determining fatigue life of the individual events that enter into a complex loading history. While the procedure is completely consistent with the results of numerous two-level tests that have been conducted on many materials, it is still necessary to verify applicability to complex loading histories. Caution is expressed that certain phenomena can also influence the applicability-for example, unusual deformation and fracture modes inherent in complex loading—especially if stresses are multiaxial. Residual stresses at crack tips and metallurgical factors are also important in creating departures from the cumulative damage theories; examples of departures are provided.
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