Abstract
The fatigue process, viewed as a sequence of slow growth periods, is described by a non-linear differential equation of the first order which includes the “creep component” of crack growth in a visco-elastic solid. It is shown that fracture in a rate sensitive medium may extend even under sustained or decreasing loads. The total rate of growth consists therefore of two terms where the first term is a familiar power law, valid for a high-cycle range and limited plasticity effects, while the second one accounts for the time-dependent contribution. Here f denotes frequency, Y is the yield stress, Kcdenotes fracture toughness, ΔK stands for the stress intensity range while the crack closure correction α, the rate sensitivity C and the constant R * are defined in the text.
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