Splitting at regions of local thinning below die entry radii is a critically important mechanism of failure in hot gas-pressure forming of sheet materials. Local thinning is controlled by sheet-die friction and die geometry, as well as sheet material properties. In this study, local thinning is investigated at a particularly severe die entry radius during hot forming of a fine-grained AA5083 sheet at . Particular emphasis is placed on the relationship between local thinning and sheet-die friction conditions. A simple analysis of the mechanics of this thinning phenomenon is presented. Finite element simulation results are presented for different sheet-die friction conditions. Sheet thickness profiles measured from parts produced in forming experiments using three different lubrication conditions are compared with predictions from simulations. Simulation predictions agree well with experimental data for the occurrence and location of thinning below a die entry radius. Additional insights into sheet-die friction for controlling local thinning and preventing premature necking failure are detailed.
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e-mail: taleff@mail.utexas.edu
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February 2010
Research Papers
Local Thinning at a Die Entry Radius During Hot Gas-Pressure Forming of an AA5083 Sheet
Eric M. Taleff,
e-mail: taleff@mail.utexas.edu
Eric M. Taleff
The University of Texas at Austin
, 1 Univeristy Station C2200, Austin, TX 78712-0292
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Louis G. Hector, Jr.,
Louis G. Hector, Jr.
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055
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John R. Bradley,
John R. Bradley
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055
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Ravi Verma,
Ravi Verma
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055
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Paul E. Krajewski
Paul E. Krajewski
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055
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Eric M. Taleff
The University of Texas at Austin
, 1 Univeristy Station C2200, Austin, TX 78712-0292e-mail: taleff@mail.utexas.edu
Louis G. Hector, Jr.
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055
John R. Bradley
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055
Ravi Verma
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055
Paul E. Krajewski
Research and Development,
General Motors Corp.
, MC 480-106-212, 30500 Mound Road, Warren, MI 48090-9055J. Manuf. Sci. Eng. Feb 2010, 132(1): 011016 (7 pages)
Published Online: February 2, 2010
Article history
Received:
January 21, 2009
Revised:
December 18, 2009
Online:
February 2, 2010
Published:
February 2, 2010
Citation
Taleff, E. M., Hector, L. G., Jr., Bradley, J. R., Verma, R., and Krajewski, P. E. (February 2, 2010). "Local Thinning at a Die Entry Radius During Hot Gas-Pressure Forming of an AA5083 Sheet." ASME. J. Manuf. Sci. Eng. February 2010; 132(1): 011016. https://doi.org/10.1115/1.4000884
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