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首页> 美国卫生研究院文献>Materials >Sensitivity Analysis of Johnson-Cook Material Constants and Friction Coefficient Influence on Finite Element Simulation of Turning Inconel 718
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Sensitivity Analysis of Johnson-Cook Material Constants and Friction Coefficient Influence on Finite Element Simulation of Turning Inconel 718

机译：Johnson-Cook材料常数和摩擦系数对车削Inconel 718有限元模拟的敏感性分析

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摘要

The Johnson-Cook (J-C) constitutive model, including five material constants ( , , , , ), and the Coulomb friction coefficient ( ) are critical preprocessed data in machining simulations. Before they become reliable preprocessed data, investigating these parameters’ effect on simulation results benefits parameter-selecting. This paper aims to investigate the different influence of five settings of the J-C constitutive equation and Coulomb friction coefficient on the turning simulation results of Inconel 718 under low-high cutting conditions, including residual stress, chip morphology, cutting force and temperature. A three-dimensional (3-D) finite element model was built, meanwhile, the reliability of the model was verified by comparing the experiment with the simulation. Sensitivity analysis of J-C parameters and friction coefficient on simulation results at low-high cutting conditions was carried out by the hybrid orthogonal test. The results demonstrate that the simulation accuracy of Inconel 718 is more susceptible to strain hardening and thermal softening in the J-C constitutive model. The friction coefficient only has significant effects on axial and radial forces in the high cutting condition. The influences of the coefficient , , and on the residual stress, chip thickness, cutting force and temperature are especially significant. As the cutting parameters increase, the effect of the three coefficients will change visibly. This paper provides direction for controlling simulation results through the adjustment of the J-C constitutive model of Inconel 718 and the friction coefficient.
机译：包括五个材料常数（，，，，）和库仑摩擦系数（）的Johnson-Cook（J-C）本构模型是加工仿真中的关键预处理数据。在它们成为可靠的预处理数据之前，研究这些参数对模拟结果的影响有利于参数选择。本文旨在研究J-C本构方程的五个设置和库仑摩擦系数对Inconel 718在低高切削条件下车削仿真结果的不同影响，包括残余应力，切屑形态，切削力和温度。建立了三维（3-D）有限元模型，并通过与仿真实验的比较验证了模型的可靠性。通过混合正交试验，对J-C参数和摩擦系数在低-高切削条件下的模拟结果进行了敏感性分析。结果表明，在J-C本构模型中，Inconel 718的仿真精度更容易受到应变硬化和热软化的影响。在高切削条件下，摩擦系数仅对轴向力和径向力有重要影响。系数和对残余应力，切屑厚度，切削力和温度的影响尤为明显。随着切削参数的增加，这三个系数的效果将发生明显变化。本文通过调整Inconel 718的J-C本构模型和摩擦系数，为控制仿真结果提供了方向。

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