Effect of pre-strain on cyclic plastic behaviour of 7050-T6 aluminium alloy

R. Branco, L.P. Borrego, J.D. Costa, F.V. Antunes
2019 Procedia Structural Integrity  
This paper aims at studying the pre-strain effect on cyclic plastic behaviour of the 7050-T6 aluminium alloy. In order to meet this goal, different series of tests with various pre-strain histories are performed under fully-reversed strain-controlled conditions. In a second stage, fracture surfaces are examined by scanning electron microscopy to identify the main fracture damage micromechanisms associated with the pre-strain scenarios. Overall, the results show that higher tensile pre-strain
more » ... els lead to lower fatigue lives. This reduction of the fatigue life expectancy tends to increase for higher cyclic strain amplitudes.
doi:10.1016/j.prostr.2019.08.024 fatcat:7tr6v3bcrfckzevicpbtdv6f2y