Improvement of Profile Accuracy Coincidence Rate in Press-Forming Simulation of High Tensile Strength Steel Considering the Bauschinger Effect

Application of high tensile strength steel to automobiles has progressed in recent years, but the springback phenomenon which occurs during press-forming with dies has become an issue, as this is a factor in increased forming costs. It is considered possible to predict the springback phenomenon of steel sheets with high accuracy by applying the Bauschinger effect discovered by J. Bauschinger as a material evaluation parameter in simulations.
This article introduces an example in which high accuracy was successfully achieved in a press-forming simulation of an automotive part with a complex shape and the profile accuracy coincidence rate was dramatically improved by obtaining material property data from a uniaxial tensile test and an in-plane reverse loading test using a Shimadzu Autograph universal testing instrument and applying those data in the simulation.