SYMPOSIA PAPER Published: 01 January 1988

Fatigue Crack-Tip Mechanics in 7075-T6 Aluminum Alloy from High-SensitivityDisplacement Field Measurements


The fatigue crack-tip deformation in the 7075-T6 aluminum alloy has been studied by moiré interferometry, which is a coherent optics technique for full-field in-plane displacement measurements in the submicrometre range. For constant-amplitude-loading conditions the local strain distributions and the crack-tip plasticity have been correlated with theoretical descriptions and models. The effects of a 60% overload on crack propagation has been investigated in terms of flaw profiles and the effective stress-intensity factor. Cyclic plasticity was originally found to depend qualitatively on crack length as much as on the overload-affected growth rate. The implications on crack closure of the moiré results are also discussed.

Author Information

Nicoletto, G
University of Bologna, Bologna, Italy
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Developed by Committee: E08
Pages: 415–432
DOI: 10.1520/STP26786S
ISBN-EB: 978-0-8031-5063-8
ISBN-13: 978-0-8031-1174-5