Monday  |  Salon 10  |  02:10 PM–02:30 PM

#15926, Thermo-mechanical Characterization of High-strength Steel through Inverse Methods

The thermo-mechanical characterization of the plastic behavior of high-strength steel is extremely important for the correct simulation of the forming process in the industry. From an experimental point of view, several tests at different temperatures are necessary to suitably identify the constitutive behavior of the material. In this work, a different approach was used and a mixed experiment was designed where the specimen undergoes different temperatures in different zones in order to test a relatively large range of temperatures with a single experiment. This can be done using a Gleeble system that allows to produce a parabolic temperature gradient along a specimen thanks to resistance heating and cooled jaw carriers. The specimen shape wa optimized to avoid large strain localization in the zone of maximum temperature using multiphysics simulations able to reproduce the heating system and the deformation process. From this experiment, the constitutive parameters of a thermo-mechanical model can be extracted using an inverse method, e.g. the Virtual Fields Method (VFM) or the Finite Element Model Updating (FEMU). In particular, VFM can be used if both the strain field and the temperature field are known from the experiments, for instance using digital image correlation and an IR-camera, while FEMU can be used in other cases.

Marco Rossi   Università Politecnica delle Marche
Luca Morichelli   Università Politecnica delle Marche
Steven Cooreman   ArcelorMittal Global R&D Gent - OCAS N.V.