Orthogonal Cutting of Gallium Nitride A Numerical Investigation

Abstract

The objective of this research is to simulate the chip formation and cutting force during the orthogonal cutting of Gallium Nitride (GaN) by conventional diamond tool. Numerical simulations were conducted to find out the Von-Mises stress, cutting force, energy balance and how these output parameters change during the machining process. The mechanical properties of GaN and Diamond, such as density, young's modulus, shear modulus, cohesion value, angle of friction, and dilation angle were taken from literature. Before conducting the numerical simulations for the machining of GaN, Steel (AISI 1045) was numerically machined, and its plastic flow stresses were matched with the published results. For Steel, Johnson-Cook material model and failure criteria were used inside ANSYS/LS-DYNA module with a rigid diamond tool. For the simulation about GaN, Mohr-Coulomb material model with Smooth Particle Hydrodynamics (SPH) approach was used. These explicit numerical simulations have been performed using ANSYS/LS-DYNA. The numerical predictions of Von-Mises stresses were found to be consistent with the literature