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Comparative Analysis of Springback in DP780 and TRIP780 Draw-bend Test

This study measures springback in DP780 and TRIP780 alloys using draw-bend tests. Yield strength, tool radius, and thickness variation were key parameters. The study examined R/t ratios and draw restraints at different levels. Equipment used included draw-bend equipment and tested specimens. Results show springback angles at different draw widths for both alloys.

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Comparative Analysis of Springback in DP780 and TRIP780 Draw-bend Test

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  1. Measurement of Springback DP780 and TRIP780

  2. Draw-bend Test • Yield Strength = 450 MPa • Tool radius =7/8 in. • Thickness was measured at 10 random points and averaged. 1.5755mm (DP), 1.4535mm (TRIP) • R/t = 7.053 (DP), 7.645 (TRIP) • Draw restraint (via back force) set at a fraction of material’s yield strength : 0.4, 0.6, 0.8, 0.9, 1.0, 1.1 25 mm, 50mm 25 in

  3. Draw-bend Equipment

  4. Draw-bend Equipment with sample loaded

  5. Tested Specimen (w=25mm) DP780 TRIP780

  6. Tested Specimen (w=50mm) DP780 TRIP780

  7. Springback Angles (w=25mm)

  8. Springback Angles (w=50mm)

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