The dynamic mechanical properties of Ti-6Al-4V alloy prepared by laser direct deposition (LDD) at different strain rates are of great significance for the application of LDD technology in the manufacture and repair of aero-engine parts. The quasi-static tensile test and dynamic compression test of Ti-6Al-4V alloy prepared by LDD (LDD-Ti-6Al-4V) were carried out under the quasi-static and high strain rate using INSTRON-5982 tensile test equipment and Split Hopkinson pressure bar (SHPB) equipment. The true stress–strain curve is obtained, which indicates that the LDD-Ti-6Al-4V has a strain rate strengthening effect. Moreover, the Johnson–Cook (J–C) constitutive model of LDD-Ti-6Al-4V was fitted based on experimental data, and the experimental process of SHPB was numerically simulated. The simulation results are basically the same as the experimental results, which proves the correctness of the J–C constitutive model of LDD-Ti-6Al-4V.

中文翻译：

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激光直接沉积制造的 TI-6AL-4V 合金：动态力学性能、本构模型和数值模拟

激光直接沉积(LDD)制备的Ti-6Al-4V合金在不同应变率下的动态力学性能对LDD技术在航空发动机零件制造和修复中的应用具有重要意义。采用 INSTRON-5982 拉伸​​试验设备和 Split霍普金森压力棒 (SHPB) 设备。得到真实的应力-应变曲线，表明LDD-Ti-6Al-4V具有应变率强化作用。此外，基于实验数据拟合了LDD-Ti-6Al-4V的Johnson-Cook（J-C）本构模型，并对SHPB的实验过程进行了数值模拟。