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 language | English |
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| Pages | 197-204 |
| Number of pages | 8 |
| State | Published - 1995 |
| Externally published | Yes |
| Event | Proceedings of the 1995 124th TMS Annual Meeting - Las Vegas, NV, USA Duration: Feb 13 1995 → Feb 16 1995 |
Conference
| Conference | Proceedings of the 1995 124th TMS Annual Meeting |
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| City | Las Vegas, NV, USA |
| Period | 02/13/95 → 02/16/95 |