Dynamic mechanical experiment and constitutive model research of 7075-T6 aluminum alloy
XIE Can-jun1,2, TONG Ming-bo1, LIU Fu3, LI Zhi-gang3, GUO Ya-zhou4, LIU Xiao-chuan5
1. Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. Commercial Aircraft Corporation of China, Ltd., Shanghai 200120, China;3. Aeronautical Science & Technology Research Institute of COMAC, Beijing 102211, China;4. College of Aeronautics, Northwestern Polytechnical University, Xi’an 710012, China;5. Aircraft Strength Research Institute of China, Xi’an 710065, China
Abstract：Dynamic mechanical experiments of 7075-T6 aluminum alloy under quasi-static、medium strain rate and high strain rate were performed by using the electronic universal testing machine、high velocity testing system and split Hopkinson tensile bar (SHTB) at room temperature. Stress-strain curves under different rates were obtained. The experimental results show that the strain rate hardening effect of 7075-T6 aluminum alloy is obvious, the necking phenomena of specimen fracture is more remarkable with strain rate increasing. Johnson-Cook constitutive model which can reflect strain and strain rate hardening effect of 7075-T6 aluminum alloy were fitted. The term of strain rate hardening in the Johnson-Cook equation was improved, making the fitting results agree better with the experimental results.
2014, Vol. 33 
