Effect of the determination method of the material parameters on the accuracy of forming limit analyses for 5000 series aluminum alloy

• Main Authors: Hakoyama, Tomoyuki, Kuwabara, Toshihiko, Barlat, Frédéric
• Format: Conference Proceeding
• Language: English
• Subjects: Aluminum alloys; Aluminum base alloys; Contours; Forming limits; Limit analysis; Metal sheets; Parameters; Plastic deformation; Strain analysis; Two dimensional models
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.4963627

The effect of the method used to determine the material parameters of a yield function on the accuracy of the forming limit strains predicted using the Marciniak-Kuczyński-type (M-K) forming limit analysis for a 5000 series aluminum alloy sheet is investigated. A tube subjected to tension-expansion loading under linear paths in the first quadrant of the stress space are performed to measure the multiaxial plastic deformation behavior and the forming limit strains of the test material. The anisotropic parameters and the exponent of the Yld2000-2d yield function (Barlat et al, 2003) are optimized to approximate the contours of the plastic work and/or the directions of the plastic strain rates. The M-K analyses are performed using the different model identifications based on the Yld2000-2d yield function. It is concluded that the yield function best capturing both the plastic work contours and the directions of the plastic strain rates leads to the most accurate predicted forming limit strains.