Negative to positive strain rate sensitivity in 5xxx series aluminum alloys: Experiment and constitutive modeling

Uniaxial tension and compression tests, at both quasi-static and dynamic ranges of loadings, are utilized to study the thermo-mechanical response of an AA5182-O sheet. The strain rate at quasi-static regime ranges from 10−4 to 100 (s−1) and at dynamic loading is chosen to be around 3500 (s−1). Measurements are reported at temperatures of 296 K, 338 K, 373 K, 423 K, and 473 K. While at temperatures lower than the critical temperature of Tc, the...