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Finite Element Method in Assessing Springback of Stamped Parts – A DKT Shell Model
Technical Paper
2005-01-0519
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Springback is one of the main detrimental factors affecting the dimensional quality of stamped parts in automotive industry. Accurate determination of springback is vital to the design of tools used in the automotive sheet stamping operations. Generally the least distance from a point on a stamped part to the die surface is used as a measurement of the amount of springback. This paper presents a reversed finite element method for assessing the springback of stamped parts. First, the point cloud (coordinate measurement data) scanned from actual stamped parts is triangulated to generate a finite element mesh with triangles. Contrary to the traditional finite element mesh from an existing CAD model, this is a reversed process in which the actual CAD data for the surface is unknown. Then finite element method is utilized to determine the deformation the stamped part needed to conform to the die surface using the minimum amount of work. In this process, only the displacement vector will be refined through optimization, which is also a reversed process. A simple example is used to verify that the nearest point is not the least energy point. Thus, the method presented here is more appropriate for assessing the springback. The proposed methodology is validated using a couple of examples with simple shell sheet. The results show that the numerical scheme is an effective, accurate, and appropriate method for assessing the springback of stamped sheet metals.
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Citation
Zheng, Q., Gu, R., and Song, J., "Finite Element Method in Assessing Springback of Stamped Parts – A DKT Shell Model ," SAE Technical Paper 2005-01-0519, 2005, https://doi.org/10.4271/2005-01-0519.Also In
References
- He N. Wagoner R. H. Springback in simulation in sheet metal forming 1996 308 315
- Xia Z. Tang S. Cames C. Accurate springback prediction with mixed solid/shell elements Simulation of Materials Processing: Theory, Methods and Applications Huetink Baaijens Balkema, Rotterdam 1998 813 818
- Ogawa H. Makinouchi A. Development of an elasto-plastic FE code for accurate prediction of springback in sheet bending processes and it's validation by experiments Advanced Technology of Plasticity 1993 1641 1646
- Li K. Wagoner R. H. Simulation of springback Simulation of Materials Processing: Theory, Methods and Applications Huetink Baaijens Balkema, Rotterdam, The Netherlands 1998 21 31
- Hu Y. A few issues on accuracy of springback simulation of automobile parts SAE SP 1999-01-1000 1999 101 105
- Rama S. Zhang J. M. A study on the effects of simulation parameters on springback prediction SAE SP 2000 1536 2000 135 142
- Gu R. J. Barber G. C. Determination of True Dimensional Quality and Build Errors Using Coordinate Measurement Data ASME Journal of Manufacturing Science and Engineering 121 1999 749 755
- Zheng Q. Gu R. J. Triangulation of Point Cloud Data for Stamped Parts Reliability and Quality in Design, 2001 Seventh ISSAT International Conference Proceedings Pham H. Lu M. 2001 205 208
- Zheng Q. Reversed Finite Element Method in Assessing Springback of Stamped Parts Oakland University 2003
- Cook R. D. Malkus D. S. Plesha M. E. Witt R. J. Concepts and Applications of Finite Element Analysis fourth John Wiley & Sons 1981
- Reklaitis G. V. Ravindran A. Ragsdell K.M. Engineering Optimization: Methods and Applications New York John Wiley 1983
- Hosford W. F. Caddell R. M. Metal Forming: Mechanics and Metallurgy Second 1993
- Matlab Online Document The MathWorks, Inc 2001
- Hughes T. J. R. Tezduyar T. E. Finite elements based upon Mindlin plate theory with particular reference to the four-node bilinear isoparametric element J. Applied Mechanics 48 587 596 1981
- Bathe K. J. Dvorkin E. N. A formulation of general shell elements - The use of mixed interpolation of tensorial components Int. J. Numerical Methods in Engg. 22 697 722 1985