Fatigue crack growth behaviour of the 6082-T6 aluminium using CT specimens with distinct notches

AbstractThis paper presents a study aiming at characterizing the fatigue crack growth behaviour of the 6082-T6 aluminium alloy using standard CT specimens. The fatigue crack growth threshold is also characterized according to the ASTM E 647 standard. Besides the standard CT specimens with sharp notches, specimens with initial circular notches were also fatigue tested. The threshold stress intensity factor ranges, ΔKth, are compared for the distinct notches under study. The fatigue crack propagation rate in the regime II are obtained using the Paris law. A comparison is made between the CT specimens geometries with distinct notches under consideration. The ΔKth values for the geometry of standard CT specimens present lower values when compared with the geometry of the CT specimens with blunted notches