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Plane-Strain Formability of Sheet Metal at High Velocity

Windholtz, Timothy Nolan
http://rave.ohiolink.edu/etdc/view?acc_num=osu1332509672

Abstract Details

2012, Master of Science, Ohio State University, Materials Science and Engineering.
Electromagnetic forming via die impact has shown results beyond normal forming limits but there is little experimental research presenting the potential of kinetic type presses. This thesis introduces a suite of sheet metal forming methods to assess forming velocity’s affect on plane-strain formability using ten different materials within three different categories of sample dimensions. In addition to strain rate effects from each technique, lubricant is varied on self-similar forming dies to investigate impact geometry and frictional conditions. Three very different ‘press’ types are used to apply a large uniform pressure over flat sheet materials into a single sided die that is accompanied by no draw-in of the material. These presses include a traditional quasi-static press, QS; an electromagnetically driven high speed press, HSP; an electromagnetically driven uniform pressure actuator, UPA; and an electromagnetically exploded foil, EF. Experimental energy requirements for electromagnetic forming, EMF, limits are reported along with characterization of the HSP peak current and velocity through the use of a Photon-Doppler Velocimeter, PDV. Cross-sectional photographs and thickness strain measurements are presented to see the strain rate effects on the samples. The resulting methodologies allow for predictions of shearing conditions and forming limits of nominally flat grooved structures.
Glenn Daehn, PhD (Advisor)
Peter Anderson, PhD (Committee Member)
94 p.
Materials Science
electromagnetically high speed press, HSP; electromagnetically uniform pressure actuator, UPA; electromagnetically exploded foil, EF; Photon-Doppler Velocimeter, PDV

Recommended Citations

Citations

  • Windholtz, T. N. (2012). Plane-Strain Formability of Sheet Metal at High Velocity [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1332509672

    APA Style (7th edition)

  • Windholtz, Timothy. Plane-Strain Formability of Sheet Metal at High Velocity. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1332509672.

    MLA Style (8th edition)

  • Windholtz, Timothy. "Plane-Strain Formability of Sheet Metal at High Velocity." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1332509672

    Chicago Manual of Style (17th edition)

osu1332509672
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© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.