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Dependence of Metal Cutting Simulations on the Johnson-Cook Model Thermal Softening Parameter

Published

Author(s)

A Deshpande, V Madhavan, V Pednekar, A H. Adibi-Sedeh, Robert W. Ivester

Abstract

The accuracy of the constitutive model is an important contributor towards the accuracy of finite element analyses of different manufacturing processes.  Due to the presence of high values of strain, strain rate and temperature in machining, the material model plays a particularly important role.  Motivated by results of split Hopkinson pressure bar tests, we have explored the impact of changing the thermal softening parameter (m) of the Johnson-Cook material model on finite element analysis of metal cutting.  We find that the friction coefficient has to be reduced in simulations with m=1.8 in order to match experimentally determined cutting force values, leading to unrealistically low thrust forces.  Reducing the friction coefficient reduces forces through lower hydrostatic pressure rather than by changes in shear angle.
Conference Dates
May 24-26, 2006
Conference Location
Milwaukee, WI, USA
Conference Title
North American Manufacturing Research Conference (NAMRC)

Keywords

flow stress, hydrostatic pressure, Johnson-Cook model, Thermal softening parameter

Citation

Deshpande, A. , Madhavan, V. , Pednekar, V. , Adibi-Sedeh, A. and Ivester, R. (2006), Dependence of Metal Cutting Simulations on the Johnson-Cook Model Thermal Softening Parameter, North American Manufacturing Research Conference (NAMRC), Milwaukee, WI, USA (Accessed June 21, 2024)

Issues

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Created December 31, 2005, Updated October 12, 2021