Abstract
Various equations to account for the mean stress dependence of crack propagation data have been described. They have been fitted to data from the aluminium alloys 7075-T6, 2024-T3 and 6082-T6, and their applicability to these alloys has been discussed. In addition, two mean stress equations were applied to crack propagation threshold data for the 5083-H321 aluminium alloy. Finally, a new equation to account for the mean stress dependence of crack propagation data has been suggested and its excellent applicability has been shown.
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