Abstract
In this paper, a new mechanical driving force parameter for long- and short-crack growth rate correlation is proposed. This new parameter, (Δ K + K max) 0.5, does not utilize disputable crack closure data, instead it is calculated as a geometric mean of the positive part of the applied stress intensity factor (SIF) range, Δ K +, and the corresponding maximum value of the SIF, K max. The proposed parameter correlates fairly well the R-ratio effects on the threshold condition and fatigue crack growth rate at the low and intermediate stress intensities for six aluminum alloys investigated.
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