A Pulse-Heated Kolsky Bar Technique for Measuring the Flow Stress of Metals at High Loading and Heating Rates |
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| Authors: | S P Mates R Rhorer E Whitenton T Burns D Basak |
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| Institution: | (1) Metallurgy Division, MSEL, National Institute of Standards and Technology, Gaithersburg, MD, USA;(2) Manufacturing Metrology Division, MEL, National Institute of Standards and Technology, Gaithersburg, MD, USA;(3) Mathematical and Computational Sciences Division, ITL, National Institute of Standards and Technology, Gaithersburg, MD, USA;(4) Orbital Sciences Corp., Dulles, VA, USA |
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| 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 6,000 K/s and strain rates up to 104 s−1. 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.
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| Keywords: | Kolsky-Bar Split-Hopkinson bar High heating rate Flow stress measurement High strain rate |
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