Predicting the forming limit diagram of AA 5182-O

Abstract

The prediction of a forming limit diagram (FLD) for aluminium alloy sheet using finite element analysis without implementing pre-defined geometrical imperfections or material imperfections is studied. The limit strains of the FLD are determined by applying a new proposed localization criterion in the dome stretching test. The elements just outside the necking area, where their major and minor principal strains have no simultaneous change after localized necking happens, are chosen as the reference elements for measurement of limit strains. Simulations are carried out for various strain paths ranging from balanced biaxial stretching to uniaxial stretching. The predicted FLD of AA 5182-O is compared with an experimentally determined FLD and very good agreement is achieved. It is demonstrated that FLDs can be predicted by the finite element method without requiring any assumed geometric or material imperfections in the numerical model.

Effect of temperature and punch speed on forming limit strains of AA5182 alloy in warm forming and improvement in failure prediction in finite element analysis

“…Tensile deformation behavior of aluminum alloys in the warm working temperature range at different strain rates has been studied by several researchers. [8][9][10][11][12][13] Shehata et al 14 performed tensile tests of several Al-Mg alloys in the temperature range of 20°C-300°C. They observed that total elongation increased by five times when temperature was increased from 20°C to 300°C.…”

Numerical determination of the forming limit curves of anisotropic sheet metals using GTN damage model

“…Because of the expenses involved by the experimental procedures of FLC construction, the theoretical (Hill, 1952;Marciniak and Kuczynski, 1967) and numerical (Li et al, 2010) methods have been more attractive to researchers. One of the suitable theoretical approaches for determination of the FLC is the Gurson-Tvergaard-Needleman (GTN) damage model (Gurson, 1977;Tvergaard, 1981Tvergaard, , 1982Tvergaard and Needleman, 1984).…”

Predicting forming limit diagrams for AZ31 magnesium alloy and 7050 aluminum alloy by numerical simulation

“…According to the Nakazima hemispherical punch experiment, the FE model including sheet, punch, die and blank holder is shown in the Figure 2. 30 The various dimensional parameters of the model are set according to the standard GB/T 15825.8-2008 “Sheet metal formability and testing methods-Guidelines for the determination of forming-limit diagrams.” The detailed dimensions are shown in Table 1.…”