Modeling springback of thick sandwich panel using RSM

The current paper attempts to develop a mathematical model to predict springback of thick sandwich panel made of steel/polyurethane (PUR)/steel in air bending process. Firstly, the behavior laws of sandwich panel components were experimentally obtained. Secondly, numerical simulations of the sandwich panel were conducted in bending process followed by springback for various process parameters. We found that the predicted springback agrees with experiment. Thirdly, three factors with three levels were considered in order to obtain a mathematical model to predict springback by using response surface method (RSM). Punch radius, die opening, and foam thickness are chosen as the main input parameters. The springback is considered as the output response. A relationship between the different factors and the response was obtained, and regression analysis has been done. The obtained results were analyzed with analysis of variance (ANOVA) in order to identify the factors’ importance on the response.