Numerical Study of Predicting Forming Process Based on Different Hardening Models in Advanced High Strength Steel Sheets

Abstract

Sheet metal shaping for advanced high strength (AHS) steel sheets is commonly utilized in the manufacturing of automobile components. This helps to decrease the weight of new structures and increase the crashworthiness performance of these structures. The phenomenon known as springback deviation plays a significant role in creating such components via deformation and fracture. This study investigated the production of an S-rail from components made of steel grade 780 with a thickness of 1 millimeter by employing appropriate simulations using finite elements (FE) and generation. The materials were initially tested in order to collect the necessary parameter sets for the models being employed. The Barlat89 yield function, the Y-U kinematic hardening model, and a model combining the Y-U kinematic hardening model with the Barlat89 yield function were all used in the simulations. In addition, the forming limit curves (FLCs were utilized to assess the computed formabilities and served as the failure criteria. The deformation, springback effect, deviations, and twist springback of the components developed after the S-rail forming were subsequently studied, measured, and the findings compared. It was discovered that the proposed yield criteria and kinematic hardening models could accurately predict the formability of the material without causing any damage. The strain distributions acquired from the Y-U kinematic hardening indicated that the sidewall curl area was slightly larger than what was predicted by previous models. The model combining the Y-U kinematic hardening model with the Barlat89 yield function produced the most accurate predictions for overall springback effect, deviations, and twist springback of the AHS steel sheets.

Finite element modeling for analyzing the production of high-strength steel sheets for automobile parts

“…10. The stress distribution on the Member C inner sample during the final forming process using the Y-U model, particularly on the sidewall area, was significantly different from the stress distribution obtained with other material models [18]. The springback angles for the generated samples could be predicted once the tooling was removed from the Member C inner forming simulation.…”

“…To evaluate the mechanical properties of high-strength sheet metal using cyclic compression and compression testing, it is necessary to have cyclic stress-strain curves with the appropriate compressive strain. The process of molding has been simulated by Sanrutsadakorn et al [18] who compared the results of the different material models based on finite element simulations. The study on V bending by Julsri et al [19] discovered that the values exhibited by AHS steel grade 980 were equivalent to the findings obtained from finite element calculations.…”