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A Pulse-Heated Kolsky Bar Technique for Measuring Flow Stress of Metals at High Loading and Heating Rates

Published

Author(s)

Steven P. Mates, Richard L. Rhorer, Eric P. Whitenton, Timothy J. Burns, D Basak

Abstract

The National Institute of Standards and Technology (NIST) has developed an electrical pulse-heated Kolsky Bar technique for measuring the constitutive response of metals at heating rates of up to 6000 K/s and strain rates up to 104 1/s. Under these conditions, which are approaching those found in high speed machining, thermally-activated microstructural processes such as grain growth, solid state phase transformation and dislocation annealing can be bypassed, leading to unique non-equilibrium superheated microstructural states. Flow stresses can thus differ significantly from equilibrium high temperature conditions. This paper describes the NIST pulse-heated Kolsky bar technique in detail, including a thorough assessment of uncertainties in temperature and flow stress measurement.
Citation
Experimental Mechanics
Volume
48

Keywords

flow stress measurement, high strain rate, Kolsky Bar, pulse heating

Citation

Mates, S. , Rhorer, R. , Whitenton, E. , Burns, T. and Basak, D. (2008), A Pulse-Heated Kolsky Bar Technique for Measuring Flow Stress of Metals at High Loading and Heating Rates, Experimental Mechanics, [online], https://doi.org/10.1007/s11340-008-9137-1 (Accessed June 15, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created April 5, 2008, Updated November 10, 2018