Analytical model for straight hemming based on minimum energy method |
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| Authors: | Qian Wang Xiang-huai Dong He-zong Li and Hai-ming Zhang |
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| Institution: | (1) General Motors Research and Development Center, MC: 480-106-212, 30500 Mound Road, Warren, MI 48090, USA |
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| Abstract: | An analytical model for straight hemming was developed based on minimum energy method to study the effect of flanging die
corner radius on hemming qualities. In order to calculate plastic strain and strain energy more exactly, the neutral layer
of specimen corner after hemming is assumed to be a half ellipse with its major semi-axis unknown. Isotropic hardening rule
is adopted to describe bending and reverse bending processes neglecting Bauschinger effect. The model takes into account the
material property parameters in order to satisfy a wide application range of different materials. Specimen profile, creepage/growing
(roll-in/roll-out) and maximum equivalent strain are predicted, which are greatly influenced by the flanging die corner radius.
Experimental facilities were designed and hemming experiments were undertaken. The predicted results of the present analytical
model were compared to experimental data as well as finite element (FE) simulation results. It was confirmed that they are
in good agreement, and the model can be used to evaluate whether the material used as an outer panel for hemming is appropriate
and to optimize process parameters when the material used for hemming is changed. |
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