Finite element models of orthogonal cutting with application to single point diamond turning

Abstract

Two computer models are described that treat the special case of orthogonal cutting. The models are based on the finite element method, which is used to discretize a portion of the workpiece in the vicinity of the cutting tool. From the models, the detailed stress and strain fields in the chip and workpiece, chip geometry and tool forces can be determined. The first model is based on a specially modified version of a large deformation updated Lagrangian code developed at Lawrence Livermore National Laboratory called NIKE2D, which employs an elastic-plastic material model. The second model treats the region in the vicinity of the cutting tool as an Eulerian flow field. Material passing through the field is modeled as viscoplastic. Results obtained from both models show excellent agreement when compared with measured tool forces for slow speed cutting of aluminium 2024-T361. © 1988.