A modified Johnson-Cook constitutive model for improved thermal softening prediction of machining simulations in C45 steel
Joshua D. Priest, Hassan Ghadbeigi, Sabino Ayvar-Soberanis, Anders Liljerehn, Matthew Way
Abstract
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.
Topics & Concepts
ThrustMaterials scienceConstitutive equationAusteniteMachiningSofteningFinite element methodThermalRotational symmetryTorqueDrillingMetallurgyStructural engineeringComposite materialMechanical engineeringMechanicsEngineeringThermodynamicsPhysicsMicrostructureHigh-Velocity Impact and Material BehaviorMetal Alloys Wear and PropertiesMicrostructure and Mechanical Properties of Steels