Effect of material and geometrical parameters on the springback of metallic sheets

One of the greatest challenges of manufacturing sheet metal parts is the elastic recovery phenomenon during unloading which leads to springback. Precise prediction of springback after removing the bending tools is the key to designing the bending tools, to controling the bending process and assessing of the accuracy of the part's geometry. This paper aims at the numerical investigation of the effects of material and geometrical parameters on springback amount. The plane-strain finite element model of the air-bending process, which is based on the updated Lagrangian elastoplastic finite element approximation, is employed for this purpose. Results showed that the Springback decreases with the elastic modulus, increases with the yield stress, Strength coefficient, die width, and sheet thickness. The most significant parameters which influence the springback are the sheet thickness, the strength coefficient the young's modulus, and the die width respectively.