Accuracy issues in modeling superplastic metal forming Metadata

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  • Main Title Accuracy issues in modeling superplastic metal forming


  • Author: Johnson, K.I.
    Creator Type: Personal
  • Author: Khaleel, M.A.
    Creator Type: Personal
  • Author: Lavender, C.A.
    Creator Type: Personal
  • Author: Smith, M.T.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)


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


  • Creation: 1995-02-01


  • English


  • Content 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.


  • Keyword: Materials Working
  • Keyword: Testing
  • Keyword: Mathematical Models
  • Keyword: Friction
  • Keyword: Experimental Data
  • STI Subject Categories: 66 Physics
  • Keyword: Finite Element Method
  • Keyword: Mesh Generation


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


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


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


  • Display Note: OSTI as DE95008934