Al–Li–Cu–Mg–Zr alloys are widely used in the aerospace industry for different applications and make an excellent concurrent to high-performance composites. This family of alloys has remarkable properties like low density, high elastic modulus, high strength and specific stiffness, fracture toughness, fatigue crack growth resistance, and improved corrosion resistance.
To produce different cups from sheet metal, deep drawing is a vital process demanded by different industries such as automobile, aeronautics and so on. The comprehension of the process’s mechanics led to the correct determination of the factors which affect the deep drawing results. Experimental tests and numerical simulations are two significant ways for analysing the deep drawing process. Experimental tests are beneficial in studying the process to control the defect of the final product. However, to gain time and substantially reduce costs the numerical modelling became a common method which could be investigate the deep drawing technique through all steps of deformation. The Coulomb friction in contact regions is one of the most influencing parameters during deep drawing. This research emphasizes the influence of friction coefficient on deep drawing in three different regions: between blank surface and punch, blank surface and die, and blank surface and blank holder. For this purpose, a 3D Finite Element Model of AA2090 Al-Li alloy was carried out to simulate the process using ABAQUS software with A combination of the statistical approach based on Taguchi Techniques in order to predict the impact of friction coefficient Thickness variation have been studied, and the thinning region have been analysing for a cylindrical deep drawing process the results obtained were used as imputes of Taguchi method and the most appropriate combination of the Coulomb friction in the three regions concerning AA2090 Al-Li alloy was found.
Aluminum lithium (Al-Li) alloys have attracted attention for military applications and aeronautic industry because of their properties especially low density compared to conventional aluminum alloys, the excellent characteristics that are attributed to the lithium addition, and to the different types of precipitations that have a radical effect on mechanical properties of Al-Li alloys. The 3rd generation of Al–Li alloys has been improved to reduce the defects of previous generations by combining the density reduction with high strength. This paper provides a review on the third generation of Al-Li alloys and its applications, the different types of precipitations, heat treatments and their influence on mechanical properties and grain refinement. Most early studies that have been realized by researchers over the last few years on aluminum lithium alloys for additive manufacturing are also reviewed in this paper.
29 October 2024 in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
Deep drawing is a manufacturing process used to produce billions of metal containers, crucial for the aerospace industry in forming thin-walled components efficiently. However, wrinkling due to compressive instability remains a significant challenge in sheet metal forming. This study investigates plastic wrinkling in sheet metal forming to enhance the final drawn shape. A 3D finite element model using ABAQUS/Explicit was developed to examine the effects of mesh topology, blank holder force, and sheet thickness on wrinkling in AA2090 Al–Li alloy. The finding indicates that that an increase in blank holder force increases wrinkle number and amplitude. Additionally, it was found that a 2000 N blank holder force is necessary to prevent wrinkling.