Abstract In order to construct the constitutive model for high speed machining of aviation aluminum alloy with different forming directions, the Split Hopkinson Pressure Bar (SHPB) impact compression experiment and the high speed orthogonal cutting experiment are carried out in the normal direction (ND), rolling direction (RD) and transverse direction (TD) of aviation aluminum alloy 7050-T7451 rolling sheet. Firstly, the deformation parameters are solved mathematically, and the shear angle, cutting force and cutting temperature are obtained. Subsequently, the initial Johnson–Cook (JC) constitutive model parameters of the material are obtained based on dynamic impact compression experiment. Then, the constitutive model parameters for high speed machining are obtained by modifying the inverse solution program of Oxley orthogonal cutting model. Finally, the modified constitutive model for high speed cutting of aviation aluminum alloy 7050-T7451 rolling sheet considering anisotropy is established. The rationality of the modified JC constitutive model and the accuracy of the results are verified by the finite element simulation.

中文翻译：

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铝合金高速切削各向异性本构模型研究

摘要 为构建不同成形方向航空铝合金高速加工本构模型，在法线方向（ND）进行了分裂霍普金森压力棒（SHPB）冲击压缩实验和高速正交切削实验，航空铝合金7050-T7451轧制板的轧制方向（RD）和横向（TD）。首先对变形参数进行数学求解，得到剪切角、切削力和切削温度。随后，基于动态冲击压缩实验获得了材料的初始 Johnson-Cook (JC) 本构模型参数。然后，通过修改Oxley正交切削模型的逆求解程序，得到高速加工的本构模型参数。最后，建立了考虑各向异性的航空铝合金7050-T7451轧制板高速切削修正本构模型。通过有限元仿真验证了修正JC本构模型的合理性和结果的准确性。