CARATTERIZZAZIONE E MODELLAZIONE AD ELEVATO STRAIN-RATE DI UNA LEGA DI ALLUMINIO

A correct material calibration is fundamental in order to simulate complex scenario like ballistic impacts. The material in the area involved by the impact can experience high deformation in a very short time. As a consequence, dynamic tests are needed in order to calibrate the constitutive law. In this work, several dynamic tests, are carried out on Al 6061 T6 specimens and the experimental data are elaborated with a procedure useful to take into account also the thermal phenomena. As a matter of fact, thermal phenomena generally affect high strain-rate tests due to the adiabatic overheating related to the conversion of plastic work. The method presented requires strong effort both from experimental and numerical point of view but could provide great advantages when high reliability of the material behavior is necessary.