Evaluation of Atkin's model of ductile machining including the material separation component
Melkote, Shreyes N.
Date of Issue2007
School of Mechanical and Aerospace Engineering
Georgia Institute of Technology
This paper provides data along with experimental evidence of ductile material separation that supports the Atkins' model of machining, which includes the energy needed for material separation along with shear and frictional dissipation. This model proposed earlier explicitly includes the energy needed for material separation in addition to that needed for shear and friction. However, no experimental evidence for material separation via ductile tearing or fracture was provided. In this work, orthogonal cutting is performed on oxygen-free high conductivity (OFHC) Copper, a highly ductile metal, at very low speeds and low uncut chip thickness where size-e ect is observed. The chip-workpiece interface is observed under a scanning electron microscope to nd evidence of material separation via ductile fracture. For values of fracture toughness and shear yield stress, that are of the same order of magnitude as that reported in the literature for OFHC Copper, the Atkins model captures the trend and the predictions are seen to be comparable to experimental data.
Journal of materials processing technology
© 2007 Elsevier This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Materials Processing Technology, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/j.jmatprotec.2006.08.019]