Abstract：In order to ensure the structural safety of 1420 Al-Li alloy due to the coupling effect of dynamic load and temperature rising of high-speed airflow friction during service, the high temperature dynamic mechanical behavior of 1420 Al-Li alloy was fully tested and characterized in this paper. According to the experimental results, an improved Johnson-Cook constitutive model considering temperature, strain rate and strain coupling effects is proposed. On this basis, the established constitutive model and damage model were written into the finite element model to accurately simulate the mechanical behavior of the solid round bar specimen under the condition of 293 ~ 573 K and the torsion velocity of 472 °/min. Finally, the equivalent stress-strain curves obtained from the tensile test and torsion test of 1420 Al-Li alloy are compared, and the applicable range of the constitutive and damage model based on the torsion test is discussed.
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