Investigation on V-Bending and Springback of Laminated Steel Sheets

Abstract

Laminated steel sheet (LSS) is a novel functional material consisting of two steel sheets sandwiched by an adhesive layer. It has good vibration damping and noise absorption attributed by the middle polymer layer, and structural function owed to the two face steel sheets. Springback is an omnipresent negative phenomenon in metal sheet bending. Experiments and simulations were conducted to analyze the effects of processing and material parameters on springback of a specified LSS for the purpose of process optimization. Various tests including lap-shear, normal tensile, and viscosity analysis were carried out to obtain the mechanical behavior of the polymer layer. A neo-Hookean hyperelastic model was accordingly developed. Tensile tests of the two skin sheets were also implemented for material model. Ninety degree V-bending experiments were fulfilled as a validation on the feasibility and efficiency of finite element method and material models. A following parametric study on 88 deg V-bending of the LSS was then implemented to provide a processing optimization for industry practice.