hyperplasticity.html

Our group is interested in developing high velocity forming techniques to facilitate aggressive sheet metal forming. Over the past several years we have shown materials can be stretched to much higher strains at high velocity versus conventional quasi-static stretching. We refer to this extended ductility in high velocity conditions as hyperplasticity . We have worked in both understanding formability in a fundamental way and applying this to practical sheet metal forming. One of the most attractive ways of developing high velocity metal forming is with electromagnetic forming. Here, an intense electrical pulse from a capacitor bank flows through an actuator. This produces intense eddy currents in any nearby conductors which then gives strong mechanical repulsion. The non-contact launch of an aluminum sheet above is one such example. The following links describe our work and this general technology area.

Please note, this page is updated frequently. Please check back and you will likely see new content.

Theses advised by Prof. Glenn S. Daehn
in Electromagnetic and High Rate Forming

	M. Altynova, M.S., (1995). "The Improved Ductility of Aluminum and Copper Rings (Tubes) by Electromagnetic Forming Technique".
	V. S. Balanethiram, Ph.D., (1996) "Hyperplasticity: Enhanced Formability of Sheet Metals at High Velocity".
	G. Fenton, M. S., (1996) "Development of Numerical Tools to Model Plasticity in Aluminum Due to Electromagnetic Forces".
	M. Padmanabhan , M. S., (1997) "Wrinkling and Springback in Electromagnetic Sheet Metal Forming and Electromagnetic Ring Compression".
	W-F. Pon*, Ph.D., (1997) "A model for Electromagne tic Ring Expansion and its Application to Material Characterization".
	V. Vohnout **, Ph.D., (1998) "A Hybrid Quasi-Static/Dynamic Process for Forming Large Sheet Metal Parts from Aluminum Alloys".
	H.M. Panshikar M. S., (2000) "Computer Modeling of Electromagnetic Forming and Impact Welding".
	S. Datta M. S., (2000) "Electromagnetic Forming and Flanging of Aluminum 6061 Tubes".
	Anthony J. Turner M.S., (2002) "Spot Impact Welding of Aluminum Sheet.
	* Co-advisor to Steve Bechtel of Applied Mechanics Program ** Co-Advisor to Rajiv Shivpuri of Industrial Systems and Welding Engineering

Downloadable PDF's
Anthony J. Turner M.S., (2002) "Spot Impact Welding of Aluminum Sheet

Anthony J. Turner , M.S. Thesis Presentation.

Manish Kamal, Ph.D (2005) "A Uniform Pressure Electromagnetic Actuator for Forming Flat Sheets"

Copyright Notice: The information on these pages is NOT public domain. Copyright is held by the authors of the content. You are welcome to browse and use the information depicted herein in teaching, lectures, presentations and publications, so long as you acknowledge where it came from. That is, use the same standards you would use if you took the information from a journal. No guarantees on accuracy are provided and no liability is accepted for loss or damage due to the use of the information contained on these pages.

Sponsors: Primary support for our work featured in this site is provided by the National Science Foundation , Division of Design, Manufacture and Industrial Innovation and The Center for Advanced Materials and Manufacturing of Automotive Components (CAMMAC) at the Ohio State University.

Comments, questions, etc., to Glenn Daehn

Last updated 13 October 2003

Basic Understanding of Electromagnetic Forming (OSU Group)
Introductory material:
	Recent overview paper
	Simple Electromagnetic Analysis Procedures
	Electromagnetic Forming Overview Article from Metal Forming (Jan '97)
	Overview Presentation on High Velocity Aluminum Forming
	State of the Art Report on Electromagnetic Forming & Application
	Electromagnetic Forming to Reduce Auto Design to Build Time
Application of electromagnetic forming to large sheet component
	Some Details on USAMP Demonstrations (Details in Ph.D. Thesis of V. Vohnout)
Books and Articles (more soon):
	Electromagnetic Metal Forming Handbook An English translation of the Russian book by Belyy, Fertik, and Khimenko
	The Pulse Magnetic Fields for Progressive Technologies A book by Yuri Batygin with assistance from Glenn Daehn (a new book published January, 2000, *here!*)
	Illustrations to magnetic pulse stamping of the printed circuit boards for electrical engineering (the tools and experimental results) by Yuri Batygin.
Modeling of Electromatnetic Forming (Electromagnetics + Plasticity + Dynamics)
	Multi-Physics Analysis Code (MAC) of R. Douglas Everhart (examples)
Manufacturers of Pulse Power Equipment
Manufactures
	Maxwell-Magneform
	IAP Research
	Pulsar Technologies (welding / crimping)
	Manget-Physik (German Mfr. of Electromagnetic Forming Hardware &MagnetoPulS Technology)
	Kharkov Polytechnic University, Ukraine (research and equipment)
Other sites related to high velocity deformation and/or hardware
Pulse Power Equipment
	Richardson Electric (ingitrons)
	Maxwell Technologies
	Aerovox Corp. (capacitor mfgr. )
	Darrah Electronics (solid state switching)
	Contents of IEEE Pulsed Power Conferences
High Velocity Forming and Pulse Power Applications
	Electroimpact Home Page (mfr. of electromagnetic dent removers etc.
	Bert Hickman's Very Interesting web-site (don't try this at home!) Many excellent links here, too
	Electrohydraulic Forming Practiced at Miller Company, Texas
	Very Large Electrohydraulic Forming Facility in Ukraine
Related Unconventional Metalworking
	Comprehensive Superplasticity site (of Dr. John Pilling of Michigan Tech)
	Superform (superplastic aluminum formers)
	FormTech (Germany) (superplastic forming)
	Lourdes Systems, Inc. (High velocity blanking)
	Examples of Explosively Formed Artwork