Determination and Application of Forming Limit Diagram of Aluminium Alloy 5083 Sheet

The present research was aimed to evaluate the formability of aluminium alloy 5083-O sheet. Two-dimensional DIC method was used to measure the strain field of uniaxial tensile specimens. The flow stress equation was obtained on the base of these measured strain and stress data. The influence of virtual gauge on strain measurement was analysed. The hemispherical punch tests were conducted, where three-dimensional DIC was used to measure the strains on the forming regions of aluminium sheets. The FLD of aluminium alloy 5083-O was established using these measured strain data. The data derived from the tests were applied in FE simulations of the inner panel of a car body. Comparison between the results of the experiments and the simulations showed that the necking and fracture of the aluminium alloy component during stamping could be accurately predicted. (paper)