Abstract
Aluminum alloy has been widely used in automobile industry, aerospace and other fields due to its characteristics of high specific strength, high specific stiffness, etc. The considerable potential for broad application of the alloy requires its workability under various processing conditions and related deformation mechanisms should be well understood. In this work, the forming limits of aluminum alloy 5083 (AA5083) at various temperatures (20-250 °C) and strain rates (0.001-0.1 s-1) are investigated numerically and experimentally. Firstly, series of tensile tests for AA5083 sheet are obtained under different experimental conditions to study its rheological behavior. Based on the stress-strain curves, a Swift constitutive equation is modified and identified by inverse analysis. Then Nakazima test is simulated with the above modified Swift model to obtain the FLD of AA5083 sheet at room temperature. Meanwhile, a novel Nakazima setup is built to obtain FLDs experimentally and validate the above numerical FLD. The GOM Aramis system is used to measure the full-field strain on specimens with different shapes. Finally, the above verified numerical model is used to predict the FLDs at elevated temperatures.
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