Study on springback prediction based on neutral layer displacement in three-dimensional stretch-bending forming of profiles

• Published in: International journal of solids and structures Vol. 311; p. 113241
• Main Authors: Yang, Songyue, Wen, Yu, Sun, Hao, Liang, Ce, Li, Yi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2025
• Subjects: Neutral layer; Profile; Simulation; Springback; Stretch-bending; Simulation; Stretch-bending; Profile; Neutral layer; Springback
• ISSN: 0020-7683
• DOI: 10.1016/j.ijsolstr.2025.113241

•This study investigates the phenomenon of springback during stretch-bending process..•The deflection of neutral layer in 3D forming section is complicated.•A composite model combining two perpendicular plane bending is proposed. Springback is an unavoidable defect in plastic forming processes, and in three-dimensional stretch-bending of profiles, it becomes even more complex due to multi-directional bending deformations. The neutral layer, where strain theoretically equals zero during bending, is subject to deflection within the cross-section of the profile due to combined bending in different planes, causing shifts in the springback direction. This study aims to investigate the springback in three-dimensional stretch-bending and predict its values. Using roller-based three-dimensional stretch-bending equipment to deform an L-shaped profile, a corresponding finite element model was constructed, complemented by experimental validation of the deformation process. Results showed that, under smaller deformation conditions, the springback matched well with predicted values, with a deviation of about 5 %. Considering the influence of discrete dies, this model effectively predicts springback behavior.