Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7195975 | Theoretical and Applied Fracture Mechanics | 2018 | 10 Pages |
Abstract
The aim of this work was to investigate the role of the normal and shear stress gradients on the life estimation of notched Al 7050-T7451 components under multiaxial stress states. In this setting, a new concept of an equivalent critical distance, Leq, was proposed. To validate the analysis a wide number of experimental fatigue data were generated for smooth and notched specimens under push-pull, torsion and combined in phase axial-torsional loadings. From these data, critical distance versus life curves (L-Nf) were obtained under torsion and push-pull loading conditions. The Modified Wöhler Curve Method (MWCM) critical plane based multiaxial model was used in conjunction with these curves and with the new Leq-Nf relationship to estimate lives. The results showed that the L-Nf curves obtained from the fully reversed torsion and push-pull tests had opposite behaviours. The best life estimates for the notched specimens under combined in phase axial-torsional loadings were obtained considering the new Leq-Nf relationship curve proposed in this work.
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Authors
M.V.C. Sá, J.L.A. Ferreira, C.R.M. da Silva, J.A. Araújo,