Multilayer Contacts In Electrical Connectors:
Experimental Results And Modelling
Author(s)
F. Ossart, S. Noel, D. Alamarguy, S. Correia & P. Gendre
Abstract
Electrical contacts are an essential part of electrical circuits and many reliability
problems are related to their failure. The present work uses numerical simulation
in view of a better analysis of the electromechanical phenomena, in the case of
multilayer electrical contacts. We study a ball/plane contact made of bulk CuZn
alloy, protected by a thin Sn surface layer. A coupled finite element analysis is
performed in order to calculate the contact resistance of the device: an
elasto-plastic model is used to determine the geometry of the contact area, then
an electrical model gives the resulting constriction resistance. Results of the
simulation are compared to experimental data. The respective contributions of
the mechanical and electrical phenomena are analysed.
Keywords: multilayer contact, finite element modelling, constriction resistance,
tin coating, electric contact.
1 Introduction
Electrical connector performances are closely linked to the mechanical behaviour
of the contact. Much work has been devoted to understand the mechanisms
involved and their complexity has been shown [1, 2]. Many contacts are made of
cuprous alloys with various plating layers. Tin finishes are commonly used
because they are cheap and can protect fairly well the copper substrates. This
study is part of a larger one aimed at investigating and improving the properties
of electroplated tin layers [3]. The contacts under study are of the ball plane type;
their geometry simulates elementary contacts in connectors. They are submitted
to a normal load and to the various failure tests representative of their conditions
Keywords
multilayer contact, finite element modelling, constriction resistance,
tin coating, electric contact.
Related Book
Other papers in this volume
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