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.
惠旭龙1 牟让科1 白春玉1 刘小川1 史同承2. TC4钛合金动态力学性能及本构模型研究[J]. 振动与冲击, 2016, 35(22): 161-168.
XI Xulong1, MU Rang-ke1, BAI Chun-yu1, LIU Xiao-chuan1, SHI Tong-cheng2. Dynamic mechanical property and constitutive model for TC4 titanium alloy. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(22): 161-168.
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