Mechanical behavior of commonly used aeronautical aluminum alloys under dynamic tension

The dynamic as well as quasi-static tensile response of five kinds of commonly used aluminium alloys (i. e. 2A12-CZ, 2A12-M, 2024-T351, 7050-T74 and 7050-T7451) were investigated by using split Hopkinson tension test (SHTB) and universal test machine. The results show that the yield stress of 7050 aluminium alloys is higher than the others. 2A12-M alloy has the lowest tensile strength among the five kinds of alloys. All of the five kinds of alloys have positive strain-rate sensitivity. The strain-rate sensitivity of 2A12-CZ is high, while the strain-rate sensitivity of 7050-T7451 is low. The dynamic tensile failure strain is much higher than the quasi-static tensile failure strain for all tested alloys. 2A12-M alloy and 2024-T351 alloy have higher dynamic tensile failure strain than the others. Finally, the Johnson-Cook and Cowper-Symonds models were chosen to characterize aluminium alloys' behavior and the parameters were obtained by fitting the experiment data. The models coincide with the experiment results fairly well.