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Numerical study of asperity distribution in an electrical contact
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). ABB Corporate Research, Sweden .
2011 (English)In: Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts, 2011, 156-160 p.Conference paper (Refereed)
Abstract [en]

Electrical contacts consists of parts where the surfaces are in contact and where the actual physical contact occur just in a few contact asperity points scattered over the whole apparent contact area. Through these contact spots between the mating bodies the mechanical load and the electric current is transmitted. Often a soft coating is used to enlarge the real contact area. Modeling the mechanical stress on the contacting material includes nonlinear effects of the electric conduction and heat generation as well as the actual mechanical contact of the asperities. A finite element model has been used to study the multiphysics of thermo electromechanical phenomena when two surface asperities are in contact. A three dimensional model describing the asperity size, distribution, normal and shear loads and material property. With geometry of hexagonal shape and symmetrical boundary conditions a larger contact surface of similar roughness can be described.

Place, publisher, year, edition, pages
2011. 156-160 p.
, Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts, ISSN 0361-4395
Keyword [en]
Coating, Finite element, Friction, Apparent contact area, Contact spots, Contact surface, Electric conduction, Electrical contacts, Electromechanical phenomenon, Finite element models, Hexagonal shapes, Material property, Mechanical contact, Mechanical loads, Mechanical stress, Multi-physics, Nonlinear effect, Numerical studies, Physical contacts, Real contact area, Shear loads, Soft coating, Surface asperities, Three-dimensional model, Coatings, Finite element method, Normal distribution, Stresses, Surfaces, Three dimensional, Electric contacts
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-150718DOI: 10.1109/HOLM.2011.6034796ISI: 000297131500024ScopusID: 2-s2.0-80054903482ISBN: 9781612846484OAI: diva2:745514
2011 IEEE 57th Holm Conference on Electrical Contacts, Holm 2011, 11 September 2011 through 14 September 2011, Minneapolis, MN

QC 20140910

Available from: 2014-09-10 Created: 2014-09-09 Last updated: 2014-09-10Bibliographically approved

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Lindholm, Per
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