Biaxial bulge test, simulation software provide accurate data on sheet materials--Test alerts to splits, wrinkles in large-strain deformation, warm forming

摘要

Editor's Note: This article discusses a new methodology to determine sheet material properties using the biaxial bulge test. A commercially available finite element package, LS-DYNA, and its optimization module, LS-OPT, are used to inversely determine sheet material properties under biaxial deformation conditions. In stamping, accurate material property data, or the flow stress curve, is an essential parameter for process simulation to predict metal flow and optimize die design in an effort to eliminate splits and wrinkles.