TY - JOUR
AU1 - Lew, A.
AU2 - Kingstedt, O.T.
AB - BackgroundExtreme application conditions frequently consist of environments involving one or more of the following factors: very high (or low) temperatures, irradiation, corrosive medium exposure, elevated stresses, and high-strain-rate loading. Due to challenges in replicating environments where more than one factor is present, experiments typically are restricted to investigating a single environmental condition.ObjectiveThe objective of the efforts outlined herein is to demonstrate the precisely-controlled high-rate heating of a variety of metallic material systems up to one-half their melting temperature within a Tension Split-Hopkinson Pressure Bar (TSHPB).MethodsSpecific materials investigated include Ti-6Al-4V, Inconel 718, and Magnesium alloy AZ31B. The adopted method integrates a duty-cycle controlled Joule heating system with a TSHPB system.ResultsAccurate and repeatable heating profiles (i.e., within ±5\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\pm 5$$\end{document} °C of the desired temperature up to 725 °C) allow testing without direct temperature monitoring. Combined, the Joule heating system and TSHPB provide an experimental setup capable of strain-rates up to 103s-1\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$10^3 \, s^{-1}$$\end{document}, a heating system that can produce currents up to 250A\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$250 \, A$$\end{document}, resulting in material-specific heating rates exceeding 100K/s\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$100 \, K/s$$\end{document}. Constraining heating times to a few seconds limits microstructural changes, thereby suppressing annealing or grain growth processes, resulting in unique, non-equilibrium superheated microstructure states.ConclusionThe presented system enables the study of elevated temperature high-strain-rate material behavior, which is relevant to improving understanding of material behavior during high-speed machining, forging, high-velocity vehicle crashes, protection system response to impacts and blast, as well as nuclear energy applications.
TI - A Joule Heated High-Temperature Tensile Split Hopkinson Pressure Bar
JF - Experimental Mechanics
DO - 10.1007/s11340-022-00866-2
DA - 2022-09-01
UR - https://www.deepdyve.com/lp/springer-journals/a-joule-heated-high-temperature-tensile-split-hopkinson-pressure-bar-P4vr3ZYxYF
SP - 1163
EP - 1174
VL - 62
IS - 7
DP - DeepDyve
ER -