Because of the massive work and high cost of milling experiments, finite element analysis technology (FEA) was used to analyze the milling process of ADC12 aluminum alloy. An improved Johnson–Cook (J–C) constitutive equation was fitted by a series of dynamic impact tests in different strain rates and temperatures. It found that the flow stress gradually increases as the strain rate rises, but it decreases as the test temperature rises. Compared with the J–C constitutive model, the predicted flow stress by the improved J–C constitutive model was closer to the experimental results when the strain rate was larger than 8000 s⁻¹ and the temperature was higher than 300 °C. A two-dimensional cycloidal cutting simulation model was constructed based on the two J–C constitutive equations which was validated by milling experiments at different cutting speeds. The simulation results based on the improved J–C constitutive equation were closer to the experimental results and showed the cutting force first increased and then decreased, with cutting speed increasing, reaching a maximum at 600 m/min.

中文翻译：

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改进的Johnson-Cook本构模型及ADC12铝合金高速铣削切削力的实验验证

由于铣削实验的繁重工作和高昂的成本，有限元分析技术（FEA）被用于分析ADC12铝合金的铣削过程。通过一系列在不同应变率和温度下的动态冲击试验，对改进的Johnson-Cook（J-C）本构方程进行了拟合。发现流动应力随着应变率的增加而逐渐增加，但是随着测试温度的升高而减小。与J–C本构模型相比，当应变率大于8000 s ^-1时，改进的J–C本构模型预测的流应力更接近于实验结果。并且温度高于300°C。基于两个J–C本构方程，构建了二维摆线切削仿真模型，该模型通过铣削实验以不同的切削速度进行了验证。基于改进的J–C本构方程的仿真结果更接近于实验结果，结果表明切削力随着切削速度的增加先增大然后减小，在600 m / min时达到最大值。