Calibration of a modified Johnson-Cook model using the Virtual Fields Method and a heterogeneous thermo-mechanical tensile test

Classical calibration procedures for phenomenological thermo-elasto-viscoplastic constitutive models usually involve a large number of tests to identify all the material parameters, leading long experimental campaigns. In present work, novel methodology that takes full advantage full-field measurements heterogeneous test is proposed. It relies on an innovative combination Virtual Fields Method and thermo-mechanical carried out Gleeble 3500 system. To assess feasibility this methodology, modified version Johnson-Cook (J-C) model dual-phase steel DP980 are selected. The three terms correspond strain-hardening, temperature, strain rate effects calibrated simultaneously behaviour material. attempted using single at constant displacement rate. This procedure repeated nominal rates 10−4, 10−3 10−2 s−1. Accurate predictions flow stress attained, but information insufficient capture positive sensitivity then combined in database calibrate model. results show reasonably predicted considered range temperatures. These unveil potential simplify process