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Experimental and numerical investigations of the failure strain of aeronautical 2024-T3 aluminum were conducted. Experiments on the Double notched tube (DNT) specimen loaded in combined tension and torsion were applied to an aluminum alloy for the first time. Numerical analysis showed that the specimen exhibited uniformity in stress-strain as plastic strain developed. Low triaxiality values and a wide range of Lode parameter values were obtained at failure conditions. The failure strain of 2024-T3 aluminum showed strong dependence on the Lode parameter in agreement with the observations reported by other authors. The use of the DNT specimen was proven to be efficient in calibrating the ductile failure model of aluminum alloys.