This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Sheet Thinning during Plane-Strain Bending
Technical Paper
2009-01-1394
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Knowledge of the net thinning strain that occurs in a sheet as it is bent over a single radius is an important component in understanding sheet metal formability. The present study extends the initial work of Swift on thinning during plane-strain bending to sheet steels with power law stress-strain behavior and with the inclusion of friction. The experimental data come from studies on the enhanced forming limit curve on DQSK steel and analysis of the curl behavior of 590R and DP600 steels. Results for single radius bending from these studies are used in the present investigation. It has been found that the amount of net thinning strain depends on back tension, initial plane-strain yield strength, and the maximum true bending strain calculated for the neutral plane at the mid-thickness of the sheet. It has also been found that for a constant initial plane-strain yield strength, as back tension increases, the amount of the thinning strain associated with unbending (i.e. straightening) progressively increases compared to amount of the thinning strain associated with bending.
Recommended Content
Citation
Levy, B. and Van Tyne, C., "Sheet Thinning during Plane-Strain Bending," SAE Technical Paper 2009-01-1394, 2009, https://doi.org/10.4271/2009-01-1394.Also In
References
- Levy B.S. Green D.E. 2002 “Analysis and Documentation of Laboratory Studies on the Enhanced FLC Concept” Auto/Steel Partnership
- Levy B.S. Van Tyne C.J. “Effect of Draw Beads on the Mechanical Properties of Steel Sheet” SAE 2007-01-1692 2007
- Swift H.W. 1948 “Plastic Bending-Under-Tension” Engineering 166 333 335
- Levy B.S. Van Tyne C.J. MacLean S.H. “Assessing the Increase in Strain as Bending Progresses”
- Hilditch T.B. Matlock D.K. Levy B.S. Siekirk J.F. “Experimental Evaluation of Curl and Tensile Properties of Advanced high Strength Steel Sheets” SAE 2004-01-1045 2004
- Van Tyne C.J. Levy B.S. Moon Y.H. “Calculation of Strain after Bending over a Roller with Known Restraining Force” Proceedings of IDDRG Conference 2005