Abstract
This paper aims to investigate the twist springback characteristics of advanced high strength steel sheet subjected to deep drawing. A C-rail benchmark, which leads to a particularly pronounced twist springback characteristics, was developed. For an accurate numerical modeling of the process, a non-quadratic anisotropic yield criterion integrated with combined isotropic and kinematic hardening model was used to describe the strain-stress behavior including anisotropy and Bauschinger effects. The corresponding mechanical experiments, namely uniaxial tension and forward-reverse simple shear tests were performed to determine the material parameters. The digital image correlation technique was applied for component tests as well as the deformation and stress-strain analysis. The experimental validation of the elastic-plastic finite element model was assessed by comparing maximum in-plane strain, thickness reduction distribution and twist springback of the drawn rail. To explore the source of twist springback, the deformation associated with in-plane stress and bending moment was analyzed. The results indicate that the bending moment before springback caused by non-symmetric stress states play an important role in twist springback and control. Certain regions of the die radius were varied in a numerical analysis to control the bending moment for the minimization of twist springback as well as the preliminary results of the relationship between the ratio of variable die radius and twist springback.
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Acknowledgments
The authors would like to thank Engineer António Festos for all support concerning the experimental tool machining. This work is funded by FEDER funds through the Operational Program for Competitiveness Factors - COMPETE and National Funds through the FCT - Foundation for Science and Technology of Portugal under the Project (PTDC/EMS-TEC/0777/2012 and SFRH/BD/103010/2014).
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Xue, X., Liao, J., Vincze, G. et al. Twist springback characteristics of dual-phase steel sheet after non-axisymmetric deep drawing. Int J Mater Form 10, 267–278 (2017). https://doi.org/10.1007/s12289-015-1275-2
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DOI: https://doi.org/10.1007/s12289-015-1275-2