Formability studies and process Parameters optimization in v and u Bending of titanium grade 2 sheet

Abstract

In recent years, the passenger and fighter jet manufactures are configuring the structure of the aircraft with strong lightweight durable materials. The selection of titanium and titanium alloys in the aerospace industry is mainly due to the exceptional properties such as high strength to density ratio and good corrosion resistance. Titanium alloys are categorized into alpha, alpha-beta and beta alloys. The alpha and beta are single phase alloys. The alpha beta is a dual phase alloy. The addition of beta stabilizers improves the strength of titanium material. The unique property of titanium such as high temperature strength has been identified as a reason for utilization of material in extreme heat applications. Aircraft manufactures articulated that about two-third of titanium material produced are used in aircraft engines and frames. The structure of SR-71 Blackbird aircraft was built with extensive use of titanium. 85% of the aircraft structure was comprised of titanium. American Society for Testing and Materials (ASTM) has recognized 31 grades of titanium and its alloys. Grade 1 to 4 is Commercially Pure (CP) titanium. Titanium grade 2 (Ti-Gr2) is preferred for its combination of properties such as excellent formability; good strength and superior corrosion resistance in industrial applications.Ti-Gr2 sheet is widely used in airframe skins, ductwork, brackets, galley equipment, heat exchangers and medical implants. The tensile test is a primary test used to determine the mechanical properties of material used in engineering applications. The result of the tensile test is a stress strain curve. The stress strain curve provides the relation between applied stress and the resulting strain newline