Problem solving of spring back for automotive components from advanced high strength steel grade RP783-980B

Presently, in automotive industries have an intensive challenge by increasing environmental regulations and the enhancement of passenger’s safety. The use of high strength steels was highly interested in research and industry applications. These materials have special forming properties such as high strength and high elongation value but in forming processes the main problem is the large amount of spring back. It occurs after released the workpiece from the die cavity and makes problem in the assembly process. Therefore, the usage of finite element (FE) simulation with kinematic hardening materials model to improve production processes is necessary. Yoshida-Uemori (Y – U) material model combined with Barlat 1989 (Yield89) yield criteria is the one of kinematic hardening materials model that shows the great capability for prediction of elastic recovery behavior. In consequence, this research has investigated on a high strength steel, RP783-980B grade, applied for producing an automotive component under forming process, and FE simulation with Y – U coupled by Yield89 model has also been used. RP783-980B steel specimens were inspected under tension and tension-compression tests. Then, all necessary material parameters were obtained and to be used for simulation of such material under the processing. Finally, the simulating results were compared with the real experimental forming parts. As a result, FE simulation with Y – U model combined with Yield89 is well suited for application to predict and improve the quality of the REINF-EXT RR SIDE MBR LH part made from RP783-980B under forming process.