As a relatively mature lightweight and high-strength alloy, aluminum alloy is widely used in aerospace. The aircraft aluminum alloys are are generally used as structural materials and have higher specific strength and better processing properties than steel. The aerospace field mainly develops aluminum alloy sheets with high strength, high toughness and strong corrosion resistance to meet the harsh usage conditions of aerospace.
Traditional aluminum alloys used for large aircraft structures are mainly high-strength 2××× series (2024, 2224, 2324, 2424, 2524, etc.) and ultra-high-strength 7××× series (7075, 7475, 7050, 7150, 7055 , 7085, etc.).
After the 1980s, although competition from new materials such as aluminum-lithium alloys, rapidly solidifying aluminum alloys, and composite materials emerged, the traditional 2××× series and 7××× series aluminum alloys still show strong vitality.
7075 aluminum alloy is a high-strength, heat-treatable deformed alloy developed by Alcoa in 1943. The alloy contains zinc, magnesium, chromium and copper as hardeners, along with smaller amounts of iron, silicon, manganese and titanium. After heat treatment, Al-7075 is much stronger than carbon steel. Its common tempers are 7075-T6, T651, T7351, T73, T76, T7651, O, W, W51, etc.
7075 t651 has an ultimate tensile strength of 570 MPa (83,000 psi) and a yield strength of 500 MPa (73,000 psi). It has an elongation to failure of 3-9%. These properties can vary depending on the form of material used. 7075 thick aluminum sheet may exhibit lower strength and elongation than the numbers listed above.
How about aa2024 properties? 2024 aluminum alloy is an aluminum alloy with copper as the main alloy element. It is used in applications requiring a high strength-to-weight ratio as well as good fatigue resistance. It can only be welded by friction welding and has moderate machinability. Due to poor corrosion resistance, they are often protected by aluminum cladding, although this may reduce fatigue strength.
2024-T3 is one of the most widely used alloys in airframe structures. It has moderate yield strength, good resistance to fatigue crack growth and good fracture toughness. 2024 aluminum alloy remains an important aircraft structural material due to its excellent damage tolerance and high resistance to fatigue crack growth under T3 aging conditions.
Original Source:https://www.aircraftaluminium.com/a/aluminum-sheet-for-airplane-fuselage.html
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