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Dynamic Flow Stress Measurements for Machining Applications



Steven P. Mates, Eran Vax, Richard Rhorer, Michael B. Kennedy, Eric P. Whitenton, Stephen W. Banovic, Timothy J. Burns


Metals undergo a combination of rapid loading and rapid heating during normal and high speed machining processes. Constitutive models for these materials, however, generally lack any information regarding kinetics of thermally-induced transformations, such as austenite formation in carbon steels, that can have profound effects on their mechanical viscoplastic behavior. The NIST electrically-pulse-heated Kolsky bar was developed specifically to probe material response under conditions approaching those present during machining operations. We have achieved heating rates in excess of 1000 °C/s combined with strain rates above 1000 s-1 with this system. This paper presents recent experimental results for AISI 1045 and AISI 1075 steel using the pulse-heated Kolsky Bar, and examines some aspects of the uncertainty of the method.
Proceedings Title
Society for Experimental Mechanics (SEM) Annual Meeting
Conference Dates
June 2-5, 2014
Conference Location
Greenville, SC


High Heating Rate, High Strain Rate, Kolsky Bar, Machining, Steel


Mates, S. , Vax, E. , Rhorer, R. , Kennedy, M. , Whitenton, E. , Banovic, S. and Burns, T. (2014), Dynamic Flow Stress Measurements for Machining Applications, Society for Experimental Mechanics (SEM) Annual Meeting, Greenville, SC, [online], (Accessed June 15, 2024)


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Created December 19, 2014, Updated February 6, 2020