STRESS CORROSION AND FATIGUE TESTS ON 7001-T75 ALUMINUM ALLOY
Technical rept. Oct 1963-May 1966
BOEING WICHITA CO KS
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Test specimens of 7001-T75 aluminum alloy were evaluated for resistance to stress corrosion and for fatigue characteristics. Alternate immersion stress corrosion tests were performed at gross area stress levels of 50 ksi, 30 ksi, and 20 ksi with steel Taper-Lok and titanium lockbolt fasteners installed in plain and cold worked holes. These fasteners were installed with clearance and interference fits. This report also includes, for comparison purposes, similar stress corrosion data on 7075-T73, 7079-T7, 7079-T62, and 7079-T611 aluminum alloy. The data for these four alloys was obtained from a separate contract. Fatigue tests were performed at 15 or -5 ksi and 15 or - 10 ksi mean plus alternating stress levels. The test configurations included an open hole monoblock design and a strap reinforcement design with steel Taper-Lok fasteners. This report also includes, for comparison purposes, similar fatigue test data on 7075-T73 and 7079-T62 aluminum alloys. The data for these two alloys was obtained from a separate contract. The 7001-T75 alloy exhibited very good resistance to stress corrosion cracking at 50 ksi gross area sustained stress. The limited number of fatigue tests indicated that the 7001-T75 alloy is potentially superior to 7075-T73 and 7079-T62.
- Properties of Metals and Alloys