Forming Limit Predictions for Single-Point Incremental Sheet Metal Forming

• Published in: 10th Esaform Conference on Material Forming: Part A(AIP Conference Proceedings Volume 907) Vol. 907; no. 1; pp. 309 - 314
• Main Authors: Van Bael, A, Eyckens, P, He, S, Bouffioux, C, Henrard, C, Habraken, A M, Duflou, J, Van Houtte, P
• Format: Journal Article
• Language: English
• Published: United States 01.01.2007
• Subjects: ALLOYS; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; DEFORMATION; FINITE ELEMENT METHOD; LOADING; MATERIALS WORKING; MATHEMATICAL MODELS; METALS; NUMERICAL ANALYSIS; SHEETS; STRAINS; THICKNESS
• ISBN: 0735404143; 9780735404144
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.2729530

A characteristic of incremental sheet metal forming is that much higher deformations can be achieved than conventional forming limits. In this paper it is investigated to which extent the highly non-monotonic strain paths during such a process may be responsible for this high formability. A Marciniak-Kuczynski (MK) model is used to predict the onset of necking of a sheet subjected to the strain paths obtained by finite-element simulations. The predicted forming limits are considerably higher than for monotonic loading, but still lower than the experimental ones. This discrepancy is attributed to the strain gradient over the sheet thickness, which is not taken into account in the currently used MK model.