Abstract:

In order to research dynamic mechanical property of aircraft structure common aluminum alloy materials(including 2024,7050 and 6061),universal testing machine and split Hopkinson pressure bar are used in large-scale strain rate (10-4 /s~104/s),quasi-static and dynamic,tension and compression testings. Dynamic stress-strain curves of those materials are obtained. Strain rate sensitivity is analyzed. The intrinsic mechanism is discussed according to the dislocation motion theory. The experimental results show that 2024 and 7050 have no strain rate sensitivity and 6061 has strain rate sensitivity.

Key words: aluminum alloy, dynamic mechanics property, Hopkinson pressure bar, strain rate, dynamic stress-strain curves