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Thermomechanical Oscillations in Material Flow During High-Speed Machining

Published

Author(s)

Matthew A. Davies, Timothy J. Burns

Abstract

This paper presents a nonlinear dynamics approach for predicting the transition from continuous to shear-localized chip formation in machining. Experiments and a simplified one-dimensional model of the flow both show that, as cutting speed is increased, a transition takes place form continuous to shear-localized chip formation in the flowfield of the material being cut. Initially, the process appears to be somewhat disordered. With further increases in cutting speed, the average spacing between shear bands increases monotonically, and the spacing becomes more regular and asymptotically approaches a limiting value that is determined by the cutting conditions and the properties of the workpiece material.
Citation
Philosophical Transactions of the Royal Society London. Series A
Volume
359
Issue
No. 1781

Keywords

adiabatic shear band, high-speed machining, Hopf Bifurcation, plasticity, relaxation oscillations chaotic dynamics

Citation

Davies, M. and Burns, T. (2001), Thermomechanical Oscillations in Material Flow During High-Speed Machining, Philosophical Transactions of the Royal Society London. Series A (Accessed April 16, 2024)
Created April 1, 2001, Updated February 19, 2017