Accuracy issues in modeling superplastic metal forming

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Description

The utility of finite element modeling in optimizing superplastic metal forming is dependent on accurate representation of the material constitutive behavior and the frictional response of the sheet against the die surface. This paper presents work conducted to estimate the level of precision that is necessary in constitutive relations for finite element analysis to accurately predict the deformation history of actual SPF components. Previous work identified errors in SPF testing methods that use short tensile specimens with gauge length-to-width ratios of 2:1 or less. The analysis of the present paper was performed to estimate the error in predicted stress that ... continued below

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17 p.

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Johnson, K.I.; Khaleel, M.A.; Lavender, C.A. & Smith, M.T. February 1, 1995.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this report can be viewed below.

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  • Pacific Northwest Laboratory
    Publisher Info: Pacific Northwest Lab., Richland, WA (United States)
    Place of Publication: Richland, Washington

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Description

The utility of finite element modeling in optimizing superplastic metal forming is dependent on accurate representation of the material constitutive behavior and the frictional response of the sheet against the die surface. This paper presents work conducted to estimate the level of precision that is necessary in constitutive relations for finite element analysis to accurately predict the deformation history of actual SPF components. Previous work identified errors in SPF testing methods that use short tensile specimens with gauge length-to-width ratios of 2:1 or less. The analysis of the present paper was performed to estimate the error in predicted stress that results from using the short specimens. Stress correction factors were developed and an improved constitutive relation was implemented in the MARC finite element code to simulate the forming of a long, rectangular tray. The coefficient of friction in a Coulomb friction model was adjusted to reproduce the amount of material draw-in observed in the forming experiments. Comparisons between the finite element predictions and the forming experiments are presented.

Physical Description

17 p.

Notes

OSTI as DE95008934

Source

  • Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995

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  • Other: DE95008934
  • Report No.: PNL-SA--24828
  • Report No.: CONF-950201--8
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/31668 | External Link
  • Office of Scientific & Technical Information Report Number: 31668
  • Archival Resource Key: ark:/67531/metadc683799

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  • February 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 7, 2016, 3:26 p.m.

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Johnson, K.I.; Khaleel, M.A.; Lavender, C.A. & Smith, M.T. Accuracy issues in modeling superplastic metal forming, report, February 1, 1995; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc683799/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.