IMPROVED METHODOLOGY FOR VALIDATION OF THE FEA MODEL USING TESTING COMPONENTS

In most cases, the components (U-profiles, Omega-profiles, box-beams) are used to validate the material model generated from the measurement of individual sheet metal parameters. The validation process consists of comparing the resultant force vs displacement from the experiment to the simulation. The loading conditions during testing are predominantly chosen based on the final application the material, and a component manufactured from it. Taking an example, the U-profiles or Omega-profiles are usually loaded in three-point-bending mode, and the so-called box-beams are loaded axially in compression mode. In mechanical testing for automotive industry, the application of dynamic loading is necessary for observation of the material behaviour under high strain rates. The machine used for this purpose can be a drop weight tower, which is usually instrumented by a crosshead displacement measurement and one load cell. However, such an instrumentation is insufficient for precise description of the component behaviour during dynamic events. The solution is offered by the high-speed 3D DIC measurement of deformation. Nevertheless, there are still many parameters that can be obtained from these tests, which can lead to much more accurate validation of the material model. In addition to the DIC measurement, a local deformation measurement by means of strain gauges and continuous temperature measurement in the notch area were proposed in this study. The result is a complex set of the material properties in a given loading conditions.