Effect of mechanical properties on wrinkling limit diagrams for Aluminum 5086 alloy annealed at different temperature

• Published in: Journal of materials science 2008-01, Vol.43 (1), p.43-54
• Main Authors: Narayanasamy, R, Satheesh, J, Loganathan, C
• Format: Article
• Language: English
• Subjects: alloys; Aluminium; Aluminum; Aluminum base alloys; Annealing; Applied sciences; Blanks; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Cross-disciplinary physics: materials science; rheology; Crystallography and Scattering Methods; Deep drawing; Dies; Exact sciences and technology; Materials Science; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metal sheets; Metals. Metallurgy; Other topics in materials science; Physics; Polymer Sciences; Punches; researchers; Solid Mechanics; Strain; temperature; Wrinkling
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-007-2126-4

This article deals with the wrinkling limit diagrams for Aluminium 5086 alloy sheets having thickness of 2.00 mm annealed at three different temperatures namely 200, 250 and 300 °C. The study pertains to deep drawing into cylindrical cups through conical die using a flat bottom punch. When a conical die is employed, the need for a hold down or clamping ring is eliminated. However, this enhances the propensity of the blank to fail by wrinkling or buckling, particularly in the early stages of a drawing process in which thin sheet blanks are used. It is proved by these researchers and others that the onset of wrinkling takes place when the ratio of strain increments (dεᵣ/dεθ) or the ratio of strain (εᵣ/εθ) reaches a critical value during the drawing process. These values which could be determined experimentally over which the wrinkling takes place has been shown in the form of wrinkling limit diagrams for the above grade at different annealed temperatures. An attempt is also made to develop the wrinkling theory that predicts the wrinkling based on results obtained in the form of wrinkling limit diagrams established for the above grade at different annealed temperatures. Further it was observed that the annealed sheets having high n-value, high R-value and high UTS/σy ratio improve the resistance against wrinkling.