Mechanical behavior of aluminum alloy 1520 under tension in the range of strain rates from 10-1 to 103 s-1

The mechanical behavior of aluminum alloy 1520 is studied in a wide range of strain rates under uniaxial tension and pressing of plates with a hemispherical indenter at velocities up to 10 m/s at room temperature using an Instron VHS 40/50-20 high-velocity servo-hydraulic test machine. The experiments are performed in accordance with the test standards ASTM E 8/E 8M, ISO 26203-2:2011, ASTM E3205, and GOST 10510-80. The obtained results are used to calibrate a constitutive equation and a model of the alloy failure under dynamic loading. The numerical simulation results for uniaxial tension of specimens with constant strain rates and high-speed punching of 1 mm thick plates with a hemispherical punch with a diameter of 20 mm are consistent with the experimental data. Numerical simulations are performed using the LS DYNA solver (ANSYS WB 15.2). To obtain adequate predictions of the mechanical behavior of aluminum-magnesium alloy 1520 using the Johnson-Cook models, it is necessary to use higher plastic strains before failure as compared to the average macroscopic values recorded during tension testing of the alloy. The presented results can be used when performing numerical studies of the mechanical behavior of structural elements and metamaterials made of alloy 1520 under dynamic loading.