On predicting the forming limit diagram for automotive aluminium sheet

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Aluminum has considerable potential as a material for automotive panels. The ability to predict forming limit diagrams accurately for aluminum is important for preventing failure in the forming process. A method is proposed to develop forming limits using Hill's1993 yield criterion. Predicted limit strains based on both Hill's 1948 and 1993 yield criterion are compared with experimental data for Aluminum 6111-T4. It is found that Hill's 1993 yield criterion can characterize localized necking in aluminum sheets well, while Hill's 1948 criterion cannot. The critical thickness rule is found useful in predicting the left hand side of FLDs.

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CIRP Annals - Manufacturing Technology