Accuracy issues in modeling superplastic metal forming

K. I. Johnson, M. A. Khaleel, C. A. Lavender, M. T. Smith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationTMS Annual Meeting
Place of PublicationWarrendale, PA, United States
PublisherMinerals, Metals & Materials Soc (TMS)
Pages197-204
Number of pages8
Publication statusPublished - 1 Dec 1995
Externally publishedYes
EventProceedings of the 1995 124th TMS Annual Meeting - Las Vegas, NV, USA
Duration: 13 Feb 199516 Feb 1995

Other

OtherProceedings of the 1995 124th TMS Annual Meeting
CityLas Vegas, NV, USA
Period13/2/9516/2/95

Fingerprint

Metal forming
friction
testing method
metal
Friction
modeling
gauge
experiment
Gages
history
prediction
Experiments
Finite element method
Testing
analysis
material
code
comparison

ASJC Scopus subject areas

  • Geology
  • Metals and Alloys

Cite this

Johnson, K. I., Khaleel, M. A., Lavender, C. A., & Smith, M. T. (1995). Accuracy issues in modeling superplastic metal forming. In TMS Annual Meeting (pp. 197-204). Warrendale, PA, United States: Minerals, Metals & Materials Soc (TMS).

Accuracy issues in modeling superplastic metal forming. / Johnson, K. I.; Khaleel, M. A.; Lavender, C. A.; Smith, M. T.

TMS Annual Meeting. Warrendale, PA, United States : Minerals, Metals & Materials Soc (TMS), 1995. p. 197-204.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Johnson, KI, Khaleel, MA, Lavender, CA & Smith, MT 1995, Accuracy issues in modeling superplastic metal forming. in TMS Annual Meeting. Minerals, Metals & Materials Soc (TMS), Warrendale, PA, United States, pp. 197-204, Proceedings of the 1995 124th TMS Annual Meeting, Las Vegas, NV, USA, 13/2/95.
Johnson KI, Khaleel MA, Lavender CA, Smith MT. Accuracy issues in modeling superplastic metal forming. In TMS Annual Meeting. Warrendale, PA, United States: Minerals, Metals & Materials Soc (TMS). 1995. p. 197-204
Johnson, K. I. ; Khaleel, M. A. ; Lavender, C. A. ; Smith, M. T. / Accuracy issues in modeling superplastic metal forming. TMS Annual Meeting. Warrendale, PA, United States : Minerals, Metals & Materials Soc (TMS), 1995. pp. 197-204
@inproceedings{a7d4a8b5343e46e5abf53ca87a628a95,
title = "Accuracy issues in modeling superplastic metal forming",
abstract = "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.",
author = "Johnson, {K. I.} and Khaleel, {M. A.} and Lavender, {C. A.} and Smith, {M. T.}",
year = "1995",
month = "12",
day = "1",
language = "English",
pages = "197--204",
booktitle = "TMS Annual Meeting",
publisher = "Minerals, Metals & Materials Soc (TMS)",

}

TY - GEN

T1 - Accuracy issues in modeling superplastic metal forming

AU - Johnson, K. I.

AU - Khaleel, M. A.

AU - Lavender, C. A.

AU - Smith, M. T.

PY - 1995/12/1

Y1 - 1995/12/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0029458850&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029458850&partnerID=8YFLogxK

M3 - Conference contribution

SP - 197

EP - 204

BT - TMS Annual Meeting

PB - Minerals, Metals & Materials Soc (TMS)

CY - Warrendale, PA, United States

ER -