A new approach has been proposed to the problem of interaction of fatigue and creep. That is, a constitutive equation for crack propagation was proposed which includes both the number of cycles N and time t based on the stochastic and kinetic theory approaches to time-dependent fracture. Using dhis equation the failure life rule was studied. Both the linear and the nonlinear life roles were shown to be derived by the present approach, the trends of which are in agreement with experimental data.
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