Transactions of Nanjing University of Aeronautics & Astronautics
Numerical Simulation of Warm Forming Behavior of High Strength Aluminum Alloy 7075
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Abstract:
Numerical analysis is critically important to understanding the complex deformation mechanics that occur during sheet forming processes. It has been widely used in simulation of sheet metal forming processes at room temperature in the automotive industry. However, material at elevated temperature behaves more differently than at room temperature and specific material parameters and models need to be developed for the simulation of warm forming. Based on the experimental investigation of material behavior of high strength aluminum alloy 7075(AA7075), constitutive equations with strain rate sensitivity at 140, 180 and 220 ℃ are developed. Anisotropic yield criterion Barlat 89 is used in the simulation. Warm forming of limit dome height tests and limit drawing ratio tests of AA7075 at 140, 180 and 220 ℃ are performed. Forming limit diagrams developed from experiment at several elevated temperatures in the previous study are used to predict the failure in the simulation results. Punch force and displacement predicted from simulation are compared with the experimental data. Simulation results agree with experimental results, so the developed material model can be used to accurately predict material behavior during isothermal warm forming of the AA7075-T6 alloy.
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