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Anisotropic Plasticity in Sheet Metal Forming: Experimental and Numerical Analysis of Springback Using U-Bending Test

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Gepubliceerd in:Machines vol. 13, no. 11 (2025), p. 1029-1053
Hoofdauteur: Ben Said Lotfi
Andere auteurs: Bouhamed Abir, Wali Mondher, Kamoun Taoufik, Muapper, Alhadri, Ayadi Badreddine, Alharbi Sattam, Rajhi Wajdi
Gepubliceerd in:
MDPI AG
Onderwerpen:
Kinematics
Accuracy
Plastic properties
Design of experiments
Mathematical analysis
Folding
Metal forming
Optimization techniques
Constitutive models
Computer simulation
Numerical analysis
Metal sheets
Quadratic equations
Influence
Statistical analysis
Springback
Rolling direction
Shear tests
Hypotheses
Numerical models
Hardening
Aluminum alloys
Statistical methods
Mathematical models
Anisotropy
Deformation
Shear strain
Cold working
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Samenvatting:Accurate forecasting of springback continues to pose a significant challenge in sheet metal forming processes. The present paper presents a numerical model designed for the precise prediction of springback, allowing for a deeper understanding of plasticity behavior during cold forming operations in sheet metals. The key contribution of this model is the introduction of a non-associated anisotropic constitutive model featuring nonlinear mixed isotropic–kinematic hardening. This model is derived from Hill’48 quadratic function and it was implemented into ABAQUS 6.13 software environment through the user defined UMAT subroutine. For improved precision, kinematic hardening parameters specific to 5083 aluminum sheet metal were meticulously derived from cyclic shear experiments. Our results demonstrate the model’s strong capability in predicting springback during the U-bending operation, achieving remarkable accuracy. The design of experiments DOE is used as a statistical method to optimize the number of experiments and analyze the effects of key input factors. In this study, sheet thickness, punch speed, and sampling angle relative to the rolling direction (RD) are examined at different levels to assess their impact on folding force and springback. The strong agreement between experimental results and theoretical predictions confirms the accuracy and reliability of the proposed models in estimating folding force and springback.
ISSN:2075-1702
DOI:10.3390/machines13111029
Bron:Engineering Database