Identification of plastic behaviour and formability limits of aluminium alloys at high temperature

In order to simulate accurately the stamping process of sheet metals, their constitutive behaviour, as well as their formability limits, must be accurately evaluated. In this work, tensile and Nakazima tests are conducted at high temperature on aluminium alloys of the 5000 series. The tensile tests are mainly used to determine the flow stress curve of the material, while the Nakazima tests, are used to determine the admissible elongation before failure at different strain ratios. The raw load-displacement curves and the deformation of the samples, measured by the optical grid method, are included in an inverse FEM procedure to best identify the real elasto-plastic law of the material and its formability limits.