| About this Abstract |
| Meeting |
13th International Conference on the Technology of Plasticity (ICTP 2021)
|
| Symposium
|
13th International Conference on the Technology of Plasticity (ICTP 2021)
|
| Presentation Title |
Forming Limit Results Comparing the Bragard Technique with a Statistical, Deformation-history Analysis |
| Author(s) |
Michael Stout, Javier Signorelli, Analía Roatta |
| On-Site Speaker (Planned) |
Michael Stout |
| Abstract Scope |
We designed a laboratory scale, Marciniak and Kuczynski, testing device to record the deformation history from limit-strain experiments and used this equipment to test a commercially designated Zn20 sheet and a drawing-quality steel. Reference limit strains were calculated with the Bragard analysis, norm ISO 12004-2, and we compared these results to a time-history approach based on Pearson’s correlation coefficient. The Bragard analysis uses the deformations outside of the necking instability to calculate the strain limits, while the time-history approach studies the deformation history within the plastic instability. For the highly rate-sensitive Zn20 the Bragard standard is conservative for all strain states. For the moderately strain-rate sensitive steel, results from the two techniques were nearly identical in balanced-biaxial tension. However, the Bragard analysis is again conservative for plane-strain and uniaxial-tension deformations. Our results indicate that the Bragard and temporal analysis should be combined to obtain the optimal forming-limit diagram. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |