NDLI: Conductivity measurements of MFCG armature material under shock and high strain rates utilizing a split-Hopkinson pressure bar apparatus

Content Provider	IEEE Xplore Digital Library
Author	Hemmert, D.J. Neuber, A.A. Dickens, J.C. Kristiansen, M. Rasty, J. Le, X.
Copyright Year	2001
Abstract	Summary form only given, as follows. Modeling and characterization of a Magnetic Flux Compression Generator (MFCG) requires detailed knowledge of the changes in conductivity of the MFCG materials during the shock-loading phase. A split-Hopkinson pressure bar apparatus (SHPB) and current source/differential amplifier setup was used to study shock-loading under controlled conditions while monitoring changes in resistivity in armature material samples. The SHPB apparatus was capable of producing strain rates up to the fracture limit of the samples tested. Actual fracturing of samples would not have allowed detailed analysis of thermal and mechanical effects in sample resistivity changes. Sample strain rate levels of up to 1/spl times/10/sup 4/ strain sec/sup -1/ were achieved with the apparatus on OFHC copper and aluminum samples. This may be comparable to switching contacts under similar shock-loading and is an order of magnitude less than the expected strain rates in the MFCG. Sample resistivity showed an initial and abrupt decrease followed by a rapid increase during loading to levels twice that of virgin samples. Short and long time based resistivity monitoring and high speed framing photography allowed differentiation between changes in resistivity due to bulk material deformation, and changes due to thermal effects.
Sponsorship	Plasma Sci. & Applications Committee
File Size	84720
File Format	PDF
ISBN	0780371410
DOI	10.1109/PPPS.2001.960898
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity measurement Conducting materials Electric shock Magnetic materials Capacitive sensors Phase change materials Thermal resistance Magnetic flux Character generation Differential amplifiers
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in