Autor(es): Nogueira, F. de Moura ; Cunha, J. ; Mateus, A. ; Malça, C. ; Costa, J. D ; Branco, R.
Data: 2020
Identificador Persistente: https://hdl.handle.net/10316/101394
Origem: Estudo Geral - Universidade de Coimbra
Assunto(s): Low-cycle fatigue; cyclic plastic behaviour; strain-softening; aluminium alloy; 7075-T651
This 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 (/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 (/2/>1.1%) and cyclic strain-softens at lower strain amplitudes (/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
Project n.o028789, financed by the European Regional Development Fund (FEDER), through the Portugal-2020 program (PT2020), under the Regional Operational Program of the Center (CENTRO-01-0145-FEDER-028789) and the Foundation for Science and Technology IP/MCTES through national funds (PIDDAC).
