Nogueira, F.Cunha, J.Mateus, A.Malça, C.Costa, J. D.Branco, R.2025-10-102025-10-102020F. Nogueira, J. Cunha, A. Mateus, C. Malça, J.D. Costa, R. Branco, Cyclic plastic behaviour of 7075 aluminium alloy, Procedia Structural Integrity, Volume 25, 2020, Pages 438-444, ISSN 2452-3216, https://doi.org/10.1016/j.prostr.2020.04.049.http://hdl.handle.net/10400.8/14246Conference name - 1st Virtual Conference on Structural Integrity, VCSI 2020; Conference city - Virtual, Online; Conference date - 16 January 2020; Conference code - 161742Cunha, Jorge - Scopus ID: 57210722517This paper aims at studying the cyclic plastic behaviour of the 7075-T651 aluminium alloy under fully-reversed strain-controlled conditions. Tests are conducted under strain-control mode, at room temperature, in a conventional servo-hydraulic machine, from smooth samples, using the single step method, with strain amplitudes (∆ε/2) in the range ±0.5 to ±2.75%. This material has exhibited a mixed behaviour, i.e. cyclic strain-hardens at higher strain amplitudes (∆ε/2/>1.1%) and cyclic strain-softens at lower strain amplitudes (∆ε/2<1.1%). A linear relationship between the degree of cyclic strain-hardening and the strain amplitude has been established for higher strain amplitudes. Fatigue-ductility and fatigue-strength properties agree with those found in the open literature for the same loading conditions.engLow-cycle fatiguecyclic plastic behaviourstrain-softeningaluminium alloy7075-T651conference paper10.1016/j.prostr.2020.04.0492452-3216