NDLI: Effects of Pressure-Dependent Contact Resistivity on Contact Interfacial Conditions

Content Provider	IEEE Xplore Digital Library
Author	Hsieh, K.-T. Satapathy, S. Hsieh, M.-T.
Copyright Year	1965
Abstract	Adequate contact pressure needs to be applied at electrical contacts to overcome contact separation force due to current constriction effects. In the railgun operation, the initial contact pressure is provided by the interference pressure between the armature and the rail. As the magnetic field is established in the bore, the electromagnetic force provides the contact pressure, as the initial contact pressure reduces due to wear or contact melting. Excessive initial contact pressure may delay the motion of the armature and cause overheating of the armature. On the other hand, insufficient initial pressure would result in contact separation of armature and rail. The contact interface is never perfectly smooth. It only contacts at discrete asperities at micro scale and at discrete points due to deformation of the contact interface at macro scale. The interface characteristics are different from the bulk behavior. A detailed model of contact resistivity is essential to compute the interfacial current density and temperature distributions accurately. A contact resistivity model was developed that is a function of contact pressure, the hardness of the softer contact member, average bulk resistivity, and contact constants. The model was implemented into the code EMAP3D. This paper presents the simulation results of the start-up of a sample railgun with and without contact resistivity.
Sponsorship	IEEE Magnetics Society
Starting Page	313
Ending Page	318
Page Count	6
File Size	894379
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity Contacts Railguns Rails Interference Magnetic fields Boring Electromagnetic forces Delay Computer interfaces sliding electrical contact (SEC) Contact resistivity
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Effects of Pressure-Dependent Contact Resistivity on Contact Interfacial Conditions

New solid armature design concept (for railguns)

Dynamic bore/interaction effects on metal armature performance (railguns)

Analysis of rotational forces in round bore railguns

Railgun recoil forces cannot be modeled as gas pressure

Laminated low cost rails and armatures for rail launchers

Sliding contact performance of multiple brush armatures

Velocity effects on metal armature contact transition (railguns)

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Effects of Pressure-Dependent Contact Resistivity on Contact Interfacial Conditions

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Effects of Pressure-Dependent Contact Resistivity on Contact Interfacial Conditions

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