Dependence of Metal Cutting Simulations on the Johnson-Cook Model Thermal Softening Parameter
A Deshpande, V Madhavan, V Pednekar, A H. Adibi-Sedeh, Robert W. Ivester
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.
May 24-26, 2006
Milwaukee, WI, USA
North American Manufacturing Research Conference (NAMRC)
, Madhavan, V.
, Pednekar, V.
, Adibi-Sedeh, A.
and Ivester, R.
Dependence of Metal Cutting Simulations on the Johnson-Cook Model Thermal Softening Parameter, North American Manufacturing Research Conference (NAMRC), Milwaukee, WI, USA
(Accessed November 30, 2023)