Numerical Prediction of Springback Shape of Severely Bent Sheet Metal
- Advanced Metal Lab., Toyota Central R and D Labs., Nagakute, Aichi, 480-1192 (Japan)
- Stamping Engineering Div., Toyota Motor Corporation, 1, Motomachi-cho, Toyota, Aichi, 471-8573 (Japan)
- Chassis Production Engineering Div., Toyota Motor Corporation, 1, Toyota-cho, Toyota, Aichi, 471-8571 (Japan)
- Measurement and Instrumentation Engineering Div., Toyota Motor Corporation, 1, Toyota-cho, Toyota, Aichi, 471-8571 (Japan)
- Engineering Technology Div., JRI Solutions, Ltd., 3-10-19 Minami-semba, Chuo-ku, Osaka, 542-0081 (Japan)
In the sheet metal forming simulation, the shell element widely used is assumed as a plane stress state based on the Mindlin-Reissner theory. Numerical prediction with the conventional shell element is not accurate when the bending radius is small compared to the sheet thickness. The main reason is because the strain and stress formulation of the conventional shell element does not fit the actual phenomenon. In order to predict precisely the springback of a bent sheet with a severe bend, a measurement method for through-thickness strain has been proposed. The strain was formulated based on measurement results and calculation results from solid element. Through-thickness stress distribution was formulated based on the equilibrium. The proposed shell element based on the formulations was newly introduced into the FEM code. The accuracy of this method's prediction of the springback shape of two bent processes has been confirmed. As a result, it was found that the springback shape even in severe bending can be predicted with high accuracy. Moreover, the calculation time in the proposed shell element is about twice that in the conventional shell element, and has been shortened to about 1/20 compared to a solid element.
- OSTI ID:
- 21061759
- Journal Information:
- AIP Conference Proceedings, Vol. 908, Issue 1; Conference: NUMIFORM 2007: 9. international conference on numerical methods in industrial forming processes, Porto (Portugal), 17-21 Jun 2007; Other Information: DOI: 10.1063/1.2740908; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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