Dynamic mechanical experiment and constitutive model research of 7075-T6 aluminum alloy

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (18) : 110-114.

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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

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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.

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strain rate / constitutive relation / Johnson-Cook model / 7075-T6 aluminum alloy / experiment

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XIE Can-jun;TONG Ming-bo;LIU Fu;LI Zhi-gang;GUO Ya-zhou;LIU Xiao-chuan. Dynamic mechanical experiment and constitutive model research of 7075-T6 aluminum alloy[J]. Journal of Vibration and Shock, 2014, 33(18): 110-114