Abstract
In sheet forming, stretch-bending deformation, (i.e. combined deformation of simultaneous stretching and bending when sheet material is stretched over a defined tool radius), is known to enhance material formability. In order to use this forming potential of sheet material, current research put its emphasis on the experimental characterization of the formability of sheet material, subjected to stretch-bending deformation and on a more reliable formability prediction in complex shaped parts. Nevertheless, significant limitations exist in the current available experimental setups for the characterization of the stretch-bending formability of sheet material. Furthermore, the predictive quality of existing formability prediction models is not sufficient to meet current industrial requirements. In this work results of an experimental characterization of influences on stretch-bending formability using existing and newly developed stretch-bending test setups are presented and a phenomenological concept that uses the experimental results to predict formability in Finite-Element simulations of complex shaped parts involving stretch-bending deformation is proposed.
References
Ghosh, A. K. and Hecker, S. S.: “Stretching limits in sheet metals: In-plane versus out-of-plane deformation”, Met. Trans., 5: 2161-2164, 1974.
Tharrett, M. R. and Stoughton, T. B.:”Stretch-Bend Forming of 1008 AK Steel”, SAE paper # 2003-011157, 2003.
D. Kitting, M. Koplenig, A. Ofenheimer, H. Pauli, E.T. Till.: “Application of a “Concave-Side Rule” Approach for Assessing Formability of Stretch-bent Steel Sheets, International Journal of Material Forming, Volume 2, Supplement 1 / August 2009. DOI: 10.1007/s12289-009-0483-z.
D.K. Uko, R. Sowerby, L.J. Duncan: “Strain Distribution in the Bending-Under-Tension Test”, CIM (Canadian Institute of Metallurgy) Bulletin, pp. 127-134, (1977).
D. Kitting, A. Ofenheimer, H. Pauli, E.T. Till: „Forming Limits of Stretch-Bent Steel Sheets”, IDDRG 2009 (Golden (CO), USA), Conference Proceedings, pp. 425-435 (2009).
T. Wierzbicki, Y. Bao, Y.W. Lee, Y. Bai: “Calibration and evaluation of seven fracture models”, International Journal of Mechanical Sciences, Vol. 47, pp. 719-743 (2005).
N.E. de Kruijf, R.H.J. Peerlings, M.G.D. Geers: “Analysis of Sheet Necking Under Combined Stretching and Bending”, International Journal of Material Forming, Volume 2, Supplement 1 / August 2009. DOI: 10.1007/s12289-009-0543-4.
M. Yoshida, F. Yoshida, H. Konishi, K. Fukumoto: “Fracture Limits of Sheet Metals Under Stretch-bending”, International Journal of Mechanical Sciences, Vol. 47, pp. 1885-1896, (2005).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kitting, D., Ofenheimer, A., Pauli, H. et al. A Phenomenological Concept to Predict Formability in Stretch-Bending Forming Operations. Int J Mater Form 3 (Suppl 1), 1163–1166 (2010). https://doi.org/10.1007/s12289-010-0979-6
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12289-010-0979-6