Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 18, Issue 4, Pages 487-506Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0749-6419(01)00006-7
Keywords
plasticity; adiabatic shear; machining; relaxation oscillations
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We compare the repeated adiabatic shear band formation that takes place at sufficiently large cutting speeds in a number of materials during high-speed machining operations with the more well-known formation of a single shear band that often takes place at sufficiently large strain rates in dynamic torsion tests on these: materials. We show that there are several major differences in the physics of the two deformation processes. In particular, the shear stress in machining over the tool-material contact length is not even approximately homogeneous. Additionally, in high-speed machining, the material flow can become convection-dominated, so that the tool can outrun the thermal front generated in the workpiece material by the high-strain-rate cutting process. We demonstrate by means of a one-dimensional continuum model that these differences can lead to repeated oscillations in the plastic flow of the workpiece material during high-speed machining, leading to the repeated formation of adiabatic shear bands. Published by Elsevier Science Ltd.
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