The effect of a notch on the tensile properties of a commercial 7075-Al alloy

The effect of notch angle and depth on the tensile properties of a peak-age d commercial 7075 alloy has been investigated. Although there seems to be l ittle or no effect of the specimen geometry on toughness, there is a notch effect on tensile properties and this is more pronounced when the notch dep th is higher. The crack extension has been observed to be predominantly tra nsgranular by dimple formation in this alloy. A relationship between the di mple size measured on the fracture surfaces and the toughness has also been established, It is argued that the fracture roughness at the onset of frac ture can be readily measured by using circumferentially notched bar tensile specimens.