Dynamic mechanical property and constitutive model for TC4 titanium alloy

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (22) : 161-168.

XI Xulong1, MU Rang-ke1, BAI Chun-yu1, LIU Xiao-chuan1, SHI Tong-cheng2

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Abstract

In order to study the dynamic mechanical property and constitutive model of TC4 titanium alloy , dynamic experiments for TC4 titanium alloy under quasi-static，intermediate strain rate and high strain rate were performed by using an electronic universal testing machine, a high velocity hydraulic servo-testing machine and a split Hopkinson press bar ( SHPB) at room temperature. The stress-strain curves under different strain rates were obtained, and a Johnson-Cook constitutive model was fitted. The dynamic mechanical property under intermediate strain rate and the effect to the constitutive model were analyzed. The experimental results show that the strain rate hardening effect and strain hardening effect of TC4 titanium alloy is obvious between 10-4~10-3s-1, the strain rate hardening effect decreases with increase in strain, and the strain hardening effect decreases with increase in strain rate. Moreover, the mechanical property under intermediate strain rate can improve the veracity of the rate sensitive parameters. Good agreement is obtained between experimental results and numerical predictions of the high speed tensile and ball impact process, which validates the accuracy of Johnson-Cook constitutive model.

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TC4 titanium alloy / intermediate strain rate / strain rate effect / Johnson-Cook constitutive model / plate impact / numerical simulation

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XI Xulong1, MU Rang-ke1, BAI Chun-yu1, LIU Xiao-chuan1, SHI Tong-cheng2. Dynamic mechanical property and constitutive model for TC4 titanium alloy[J]. Journal of Vibration and Shock, 2016, 35(22): 161-168

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