Springback behavior of dp600 steel: an implicit finite element simulation

摘要

The paper deals with simulating the springback behavior of DP 600 sheet metal, widely used in automotive industry, after the bending process. ANSYSY commercial software was used to analyze the forming operation. Tensile tests had been conducted to obtain stress-strain curve, strain hardening exponent and anisotropy coefficients. The experimental data were used as input for the modeling. The finite element analysis is carried out to determine the degree of springback of four different bending angles, five different punch radiuses and six different sheet metal thickness. Springback is found to be dependent on the punch radius to sheet metal thickness ratio. An equation is proposed to calculate the degree of springback for DP600 dual phase steel sheet, taking into account die angle, punch radius and sheet metal thickness. To investigate the springback elimination, bottoming was simulated after bending for different forming angles. The stroke of the punch was increased by 3%, 6% and 9% of sheet metal thickness for bottoming analysis after bending. The analysis showed that the springback has been reduced by bottoming.