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

Published

January 1, 2006

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)

Pub Type

Conferences

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 October 5, 2024)