Material Characterization in the Chip-Tool Deformation Zone : An Application of Boundary-layer Theory

Abstract

In high speed metal cutting the shear strain in the secondary shear zone is confined to a plastic boundary layer which is similar to that fluid mechanics. The material behavior in this zone can be described in terms of theology as a Bingham plastic flow. In the present paper Oldroyd's solution for the plastic boundary layer near a semi-infinite thin knife is applied to the secondary shear zone. Results for boundary-layer thickness, shear strain rate and shear flow strength are obtained and compared with experimental data. The comparisons are encouraging.