NDLI: Model of contact transitioning with realistic armature-rail interface

Content Provider	IEEE Xplore Digital Library
Author	Barber, J.P. Dreizin, Y.A.
Copyright Year	1965
Abstract	Arcing transition of metal-to-metal contacts is a key technical challenge in the development of railgun launchers. Theoretical understanding of the process remains poor and controversial. Several authors have explained transitioning by a velocity skin effect driven "melt wave" Others have shown experimentally, that arcing transition even occurs for static contacts subject to high current pulses, and have proposed a "contact resistance" model, with the contact resistance due to A-spots. This model explained the available experimental data reasonably well for armatures with relatively short lengths of the contact zone. The velocity skin effect model assumes a perfect, resistance free contact, while the contact resistance model neglects any velocity related effects. In this paper we combine the two approaches to obtain a more realistic picture of the velocity skin effect and its role in transitioning of armature contacts. We show that when realistic properties of the contact interface are taken into account, the structure of the velocity skin effect and the speed of a wave of local transitioning may significantly differ from the "ideal" theory.<>
Sponsorship	IEEE Magnetics Society
Starting Page	96
Ending Page	100
Page Count	5
File Size	407939
File Format	PDF
ISSN	00189464
Volume Number	31
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Contact resistance Skin effect Rails Railguns Conductivity Copper Aluminum Current density Magnetic analysis Contracts
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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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
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Effect of rail/armature geometry on current density distribution and inductance gradient

Electric-Current-Induced Liquid Al Deposition, Reaction, and Flow on Cu Rails at Rail–Armature Contacts in Railguns

Velocity effects on metal armature contact transition (railguns)

Effect of Current Crowding on Microstructural Evolution at Rail-Armature Contacts in Railguns

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Experimental Investigation of Pseudo-Liquid Armature With Air-Spring for Railguns at Zero Speed

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Model of contact transitioning with realistic armature-rail interface

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