Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Cyclic deformation and fatigue of 7050-T7451 aluminum alloy
Submission Author:
Karen Viviana Fabara , Colombia , Brazil
Co-Authors:
Cainã Bemfica de Barros, Fábio Castro, JORGE FERREIRA, Karen Viviana Fabara
Presenter: Fábio Castro
doi://10.26678/ABCM.COBEM2017.COB17-0600
Abstract
The cyclic stress-strain and fatigue behaviors of 7050-T7451 aluminum alloy are investigated in this work. Solid cylindrical specimens were subjected to strain-controlled uniaxial loading with strain ratio Rε = -1 and 0.01 and strain amplitudes from 0.3% to 1.5%. For Rε = -1, a small amount of cyclic softening was observed for strain amplitudes greater than 0.85%. For strain amplitudes less than 0.85%, insignificant cyclic hardening/softening was observed. For the fully reversed tests performed at strain amplitudes lower than 0.6%, the deviation in the ascending branches of the stabilized stress–plastic strain hysteresis loops indicates a non-Masing behavior. For Rε = 0.01, small cyclic hardening was observed in the material for strain amplitudes greater than 0.5%, while insignificant cyclic hardening/softening was observed for strain amplitudes less than 0.5%. The tensile mean stress observed in the first loading cycle is relaxed when the strain amplitude is greater than 0.4%. No significant variation of the cyclic properties along the thickness of the alloy 7050 plate was observed in the range of fatigue lives investigated (10‒105 cycles to failure). The Smith‒Watson‒Topper parameter can satisfactorily correlate the fatigue life of 7050-T7451 Al alloy under strain-controlled cycling with Rε = -1 and Rε = 0.01.
Keywords
7050-T7451 aluminum alloy, Cyclic deformation, Fatigue life.
