Benefits and Advancements in Aluminum Products for Upper Wings

Progress in the development of several plate and extrusion products for use in compression dominated upper wing applications is presented here. Advanced aluminum-lithium plate alloy candidates target compressive strength equivalent to that of 7055-T7751 with higher modulus, similar fracture toughness and improved fatigue, fatigue crack growth and corrosion performance.  Advanced Al-Li extruded alloys that complement the plate product for the manufacture of wing skins are also discussed. The improved fatigue performance of these products is highlighted. Trade studies showing the benefit in terms of weight savings and durability using advanced products and advanced design considerations are discussed