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Identification of material constitutive law constants using machining tests: a response surface methodology based approach

机译：使用加工试验鉴定材料本构法常数：基于响应面方法的方法

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The finite element modeling (FEM) of chip formation is one of the most reliable tools for the prediction and optimization of machining processes; thanks to the high performance of advanced computers and robust finite element codes which made the modeling of complex machining processes (turning, milling, and drilling) possible. The success of any FEM strongly depends on constitutive law which characterizes the thermo-mechanical behavior of the machined materials. Johnson and Cook's (JC) constitutive model is widely used in the modeling of machining processes. However, one can find in the literature, different coefficients of JC's constitutive law for the same material which can significantly affect the predicted results (cutting forces, temperatures, etc.). These differences were attributed to the different methods used for the determination of the material parameters. In the present work, an inverse method, based on orthogonal machining tests, was developed to determine the parameters of the JC constitutive law. The originality of this study lies in the use of the response surface methodology (RSM) as a technique to improve the existing inverse method. The studied material is a 6061T6 high strength aluminum alloy. It is concluded that the calculated flow stresses obtained from the proposed approach were in a good agreement with the experimental ones. Moreover, the material parameters obtained from the present study predict more accurate values of flow stresses as compared to those reported in the literature.
机译：芯片形成的有限元建模（FEM）是最可靠的加工工艺预测和优化的工具之一;由于高级计算机的高性能和强大的有限元码，使得复杂加工过程（转动，铣削和钻井）建模。任何FEM的成功都强烈取决于构成机加工材料的热力学行为的本构规定。约翰逊和厨师（JC）本构模型广泛用于加工过程的建模。然而，人们可以在文献中找到，JC的不同系数的同一材料的不同系数可以显着影响预测结果（切割力，温度等）。这些差异归因于用于确定材料参数的不同方法。在本作工作中，开发了一种基于正交加工测试的逆方法以确定JC本构法的参数。本研究的原创性在于使用响应面方法（RSM）作为提高现有逆方法的技术。研究的材料是6061T6高强度铝合金。得出结论，从拟议方法获得的计算流量应与实验性吻合一致。此外，与文献中报道的那些相比，从本研究中获得的材料参数预测了流动应力的更准确值。

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