Predicting plasticity and fracture of severe pre-strained EN AW-5182 by Yld2000 yield locus and Hosford-Coulomb fracture model in sheet forming applications

The objective of this contribution is to evaluate the capabilities of the Yld2000 yield locus and the Hosford-Coulomb fracture model under isothermal conditions for an EN AW-5182 H18 material in sheet metal forming applications. The calibration of the Yld2000 model is based on uniaxial tension tests in 0°, 45° and 90° in respect to rolling direction and additional layer compression tests. Subsequently, the calibrated plasticity model is evaluated under shear stress and plane strain dominant conditions. Stress state dependent fracture strains are obtained from various tensile tests as well as from FLD tests. The implemented failure prediction is based on a generalized incremental stress-state dependent fracture model (GISSMO) combined with a three-parameter Hosford-Coulomb fracture and instability curve. Finally, the plasticity and fracture models are validated at a cross die cup. It is shown that the models are capable to provide an accurate prediction of the onset of fracture and could be used for a non-isothermal extension in future work. (paper)