Springback analysis for sheet forming processes by explicit finite element method in conjunction with the orthogonal regression analysis

A new method to evaluate the amount of springback in sheet forming processes based on the explicit _nite element method and the orthogonal regression analysis is presented in this paper[ To calculate springback accurately\ a simple but e}ective contact searching algorithm is described and Lagrangian multiplier method was used to evaluate the contact force[ The loading and unloading process could be simulated within one code[ The numerical results by the present method were compared with the results by the commercial dynamic explicit code LS!DYNA2D\ also with the experimental results and very good agreement was drawn[ In order to obtain the springback conveniently for the purpose of practical use\ the orthogonal regression analysis was implemented to establish the explicit relationship between the springback and some design parameters[ The present method has been applied to the analysis of some actual sheet forming processes and very good agreement between the numerical results and the experimental results in the _nal geometry was obtained