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Open AccessArticle

Determination of Johnson–Cook Constitutive Parameters for Cutting Simulations

Institute for Machine Tools, University of Stuttgart, Holzgartenstraße 17, 70174 Stuttgart, Germany
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Metals 2019, 9(4), 473; https://doi.org/10.3390/met9040473
Received: 29 March 2019 / Revised: 12 April 2019 / Accepted: 19 April 2019 / Published: 23 April 2019
(This article belongs to the Special Issue Constitutive Modelling for Metals)
The Johnson–Cook constitutive equation is very widely used for simulating cutting processes. Different methods are applied for establishing parameters of the constitutive equation. Based on the methods analysed in this study, two algorithms were worked out to determine the constitutive parameters for the prevailing conditions during cutting processes. In the first algorithm, all constitutive parameters were established simultaneously with standardized test methods. In the second algorithm, the constitutive parameters were established separately in accordance with the cutting conditions prevailing in machining processes. The developed methodology was verified with AISI 1045 heat-treatable steel and Ti10V2Fe3Al (Ti-1023) titanium alloy. The two materials were examined in standardized tensile and compression tests with varying strain rates and temperatures. In addition, the kinetic characteristics of the orthogonal cutting process were established. Based on the results obtained by experiment and the algorithms developed, the constitutive parameters for the cutting conditions were calculated. The parameters were used to determine the material model for simulating the orthogonal cutting process. The algorithms developed were verified by comparing the simulated and experimentally determined kinetic cutting characteristics, which confirmed their good quality. View Full-Text
Keywords: computational constitutive modelling and experimental validation; Johnson–Cook constitutive equation; tensile/compression and cutting test; cutting simulation computational constitutive modelling and experimental validation; Johnson–Cook constitutive equation; tensile/compression and cutting test; cutting simulation
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Storchak, M.; Rupp, P.; Möhring, H.-C.; Stehle, T. Determination of Johnson–Cook Constitutive Parameters for Cutting Simulations. Metals 2019, 9, 473.

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