Inverse identification of large strain plasticity using the hydraulic bulge-test and full-field measurements

The hydraulic bulge test (HBT) is an important experimental technique to identify the properties of materials and, in particular, metals. One main advantages such technique, testing metals, possibility reaching high levels deformation before fracture. Moreover it allows investigation a biaxial loading condition. A hemispherical can be performed using mechanical punches or pressure fluid. When used, not affected by friction. therefore very efficient method evaluate metals at large strains. Usually, outcome HBT hardening curve equi-biaxial stress state that occurs top dome, during expansion. In this paper different approach proposed, where full-field displacement field obtained with stereo-DIC used inverse identification scheme. finite strain theory map and reference configuration so problem reduced 2D plane case. was first validated numerical model then applied on real BH340 steel.