Influence of the pressure dependent coefficient of friction on deep drawing springback predictions

• A pressure dependent coefficient of friction model is fitted to three steels.
• Springback predictions of HSS are influenced by the coefficient of friction model.
• In low strength steel the coefficient of friction model is negligible.
• The pressure dependent coefficient of friction improved the accuracy of springback prediction in a 25%.

The aim of this work is to show the influence of defining a pressure dependent friction coefficient on numerical springback predictions of a DX54D mild steel, a HSLA380 and a DP780 high strength steel. The pressure dependent friction model of each material was fitted to the experimental data obtained by Strip Drawing tests and then implemented in the numerical simulation of an industrial automotive part drawing process. The results showed important differences between defining a pressure dependent or a constant friction coefficient. Finally, the experimental part was produced to compare the real geometry with the predictions obtained with the different simulation strategies. An improvement of 20–25% in springback prediction was achieved when using the pressure dependent friction model.

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