| Mechanics & Mechanical Engineering |
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| Analytical model for straight hemming based on minimum energy method |
| Qian Wang, Xiang-huai Dong, He-zong Li, Hai-ming Zhang |
| National Engineering Research Center of Die & Mold CAD, Shanghai Jiao Tong University, Shanghai 200030, China |
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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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Received: 03 November 2010
Published: 04 July 2011
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