Numerical investigation of temperature and forming rate effect on AA5086 warm formability

Cunsheng Zhang (1) , Guoqun Zhao (1) , Hao Chen (1) , Lionel Leotoing (2)

1 Key laboratory for liquid-solid structural evolution and processing of materials
2 LGCGM - Laboratoire de Génie Civil et Génie Mécanique

The poor formability of aluminum alloy at room temperature limits its use in some products with complex shapes, hence the warm forming process is intended to overcome this problem by using an elevated temperature. Now, the warm formability of AA5086 has not previously been well investigated in the literatures, especially at a rapid forming rate. In this paper, a numerical method has been developed to investigate the warm formability of an AA5086 sheet. Firstly, the dynamic tensile test was carried out under different forming temperatures and forming rates to identify an appropriate constitutive law for the sheet. The inverse analysis was performed to identify the parameter values in the constitutive law. Then based on the commercial finite element program ABAQUS, the Marciniak test was simulated to evaluate the sheet formability of by implementing a user-defined material subroutine UHARD. The effects of forming temperature and forming rate on sheet formability were investigated and it is shown that the formability of AA5086 seems to be insensitive to the forming temperature and forming rate.

Mots clés: Forming Limit Diagrams (FLDs); Marciniak test; Warm formability

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Cunsheng Zhang, Guoqun Zhao, Hao Chen, Lionel Leotoing. Numerical investigation of temperature and forming rate effect on AA5086 warm formability. 7th International Forum on Advanced Material Science and Technology, Jun 2010, Dalian, China. pp.607-610. ⟨hal-00979407⟩