Abstract
The fatigue crack growth in D16AT aluminum alloy specimens with multiple stress concentrators in the form of holes is investigated experimentally. A generalized kinetic fatigue crack growth curve is obtained and the Paris equation coefficients are determined for a great number of cracks. It is shown that a general linear, semi-logarithmic relationship exists between these coefficients for aluminum alloys D16AT, 2024-T3, and 7075-T6. The statistical description of the fatigue crack growth based on the Paris equation is specified by the distribution of the exponent m, which is log-normal for aluminum alloys whose numerical characteristics are common to all types of alloys.
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