Investigation on Twisting and Side Wall Opening Occurring in Curved Hat Channel Products Made of High Strength Steel Sheets

Modelling of mandrel rotary draw bending for accurate twist springback prediction of an asymmetric thin-walled tube

“…Being different to twist springback in the occurrence of residual stress released, the extrinsic parameter of torsion loading is provided as known condition. In sheet metal stamping, Takamura et al (2011) show that twist torque around the longitudinal axis using the stress distributions can be obtained by FE analysis. Through the investigation of twist torque and its transition during the drawing and die removal processes, they find that the negative torque generated by side wall opening occurring in the die removal process is the dominant factor in positive twist.…”

Pre-strain effect on twist springback of a 3D P-channel in deep drawing

“…However, the springback problems of DP steel caused after sheet metal forming process are serious due to the relatively high level of elastic deformation. Furthermore, the non-linear elastoplastic behavior of the sheet under non-proportional loading is likely to induce more complicate springback (Takamura, et al, 2011). In particular for the hat-shaped channels, springback not only causes a longitudinal offset, but also a certain degree of twist (Pham, et al, 2014).…”

Reduction of Springback in Hat Channel with High-Strength Steel Sheetby Stroke Returning Deep Drawing

“…In order to address twisting phenomenon, we carried out experiments in previous studies in an attempt to clarify the causes of twisting [1] and reduce twisting [2]. In this study, the drawing operation of hat channel products with curved and straight parts combined in the longitudinal direction was investigated.…”