A modified Johnson-Cook constitutive model for improved thermal softening prediction of machining simulations in C45 steel

A new modified Johnson-Cook model is developed to capture the non-linear thermal softening behaviour below the austenite transformation temperature (723°C) in C45 ferritic-pearlitic steel, which is not captured by the original Johnson-Cook (JC) model. The physical mechanisms responsible for this beh...

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Bibliographic Details
Published in:Procedia CIRP 2022, Vol.108, p.106-111
Main Authors: Priest, Joshua, Ghadbeigi, Hassan, Ayvar-Soberanis, Sabino, Liljerehn, Anders, Way, Matthew
Format: Article
Language:English
Subjects:
C45
Johnson-Cook
machining
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Summary:A new modified Johnson-Cook model is developed to capture the non-linear thermal softening behaviour below the austenite transformation temperature (723°C) in C45 ferritic-pearlitic steel, which is not captured by the original Johnson-Cook (JC) model. The physical mechanisms responsible for this behaviour are also studied. The model is developed by experimental quasi-static and high strain rate axisymmetric compression testing from 20°C to 720°C and implemented into 3D finite element drilling simulations. The improvement over the original JC model is demonstrated by comparison to experimentally measured torque and thrust force.
ISSN:2212-8271
2212-8271
DOI:10.1016/j.procir.2022.03.022