对TC8钛合金进行了不同应变速率（0.000 1，0.001，0.01 s^-1）下的室温准静态拉伸试验，并采用霍普金森压杆装置进行了不同应变速率与温度下的动态压缩试验，研究了该合金的准静态和动态力学性能；通过拟合试验数据获取参数建立J-C本构模型，并进行了试验验证。结果表明：随着准静态拉伸试验中应变速率的增大，TC8钛合金的屈服强度、抗拉强度与最大等效失效塑性应变均增大；随着室温动态压缩试验中应变速率的增大，合金的屈服强度与极限强度增大，表现出明显的应变速率强化效应，随着温度的升高，合金的屈服强度与极限强度降低，表现出明显的温度软化效应；由J-C本构模型计算得到的真应力-真应变曲线与试验结果相吻合，其平均相对误差为4.82%，说明该本构模型可以很好地预测TC8钛合金的高温动态力学性能。

TC8 titanium alloy was subjected to room temperature quasi-static tensile tests at different strain rates (0.000 1, 0.001, 0.01 s^-1) and dynamic compression tests at different strain rates and temperatures on the Hopkinson pressure bar device. The quasi-static and dynamic mechanical properties of the alloy were studied. The test data was fitted to obtain the parameters and then J-C constitutive model was established. The constitutive model was verified by tests. The results show that the yield strength, tensile strength and maximum equivalent failure plastic strain of TC8 titanium alloy all increased with increasing strain rate in the quasi-static tensile tests. The yield strength and ultimate strength of the alloy increased with increasing strain rate in the room temperature dynamic compression test, exhibiting an obvious strain rate strengthening effect; the yield strength and ultimate strength decreased with increasing temperature, exhibiting a significant temperature softening effect. The true stress-true strain curve calculated by the fitted J-C constitutive equation was consistent with the test results, and the average relative error was 4.82%, indicating that the constitutive model could predict the dynamic mechanical properties of TC8 titanium alloy at high temperature.