Springback Analysis with a Modified Hardening Model

Paper #:
  • 2000-01-0768

Published:
  • 2000-03-06
Citation:
Geng, L. and Wagoner, R., "Springback Analysis with a Modified Hardening Model," SAE Technical Paper 2000-01-0768, 2000, https://doi.org/10.4271/2000-01-0768.
Pages:
13
Abstract:
Previously-reported draw-bend tests showed large discrepancies in springback angles from those predicted by two-dimensional finite element modeling (FEM). In some cases, the predicted angle was several times the measured angle. With more careful 3-D simulation taking into account anticlastic curvature, a significant discrepancy persisted. In order to evaluate the role of the Bauschinger Effect in springback, a transient hardening model was constructed based on novel tension-compression tests for for three sheet materials: drawing-quality steel (baseline material), high-strength low-alloy steel, and 6022-T4 aluminum alloy. This model reproduces the main features of hardening following a strain reversal: low yield stress, rapid strain hardening, and, optionally, permanent softening or hardening relative to the monotonic hardening law. The hardening law was implemented and 3-D FEM was carried out for comparison with the draw-bend springback results. Marked improvement was obtained, particularly for large springback angles.
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