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

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Author(s): Steven P. Mates; Richard L. Rhorer; Eric P. Whitenton; Timothy J. Burns; D Basak;
Title: A Pulse-Heated Kolsky Bar Technique for Measuring Flow Stress of Metals at High Loading and Heating Rates
Published: April 05, 2008
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
Pages: pp. 799 - 807
Keywords: flow stress measurement;high strain rate;Kolsky Bar;pulse heating
Research Areas:
DOI: http://dx.doi.org/10.1007/s11340-008-9137-1  (Note: May link to a non-U.S. Government webpage)