Abstract
The present work is devoted to the study of the fatigue of an extruded aluminum alloy 2017A under cyclic loading in axial and shear directions at room temperature. Having the lifetime under a given axial amplitude σa (say, Nf_a) and the lifetime under a given torsional amplitude τa (say, Nf_t) [1], the objective here is to evaluate the lifetime when σa and τa are applied successively according to non-proportional path: σa then τa then σa then τa and so on until the fracture of the specimen. The obtained lifetime Nf_np is then compared to (Nf_a / 2 + Nf_t / 2). The obtained results point out the importance of the loading magnitude. Microstructural analyses have been performed to better understand the fracture mechanisms for the different cases of loadings.
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