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Calculation of the wear surface and the coefficient of friction for various coated contact geometries.pdf
Wear 368-369 (2016) 390–399
Contents lists available at ScienceDirect
Wear
journal homepage: /locate/wear
Calculation of the wear surface and the coef?cient of friction for various coated contact geometries
Tobias Dyck a,c,n, Philipp Ober-W?rder a,b, Andreas Bund c
a WAGO Kontakttechnik GmbH Co. KG, Minden, Germany b Paderborn University, Paderborn, Germany c TU Ilmenau, Institute of Materials Science and Engineering, Ilmenau, Germany
article info
Article history: Received 4 May 2016 Received in revised form 13 October 2016 Accepted 18 October 2016 Available online 20 October 2016
Keywords: Sliding wear Friction Electrical Contacts
abstract
The scope of this work is the calculation of a coef?cient of friction as a function of wear cycles for a degrading coated contact. The coating system guarantees a speci?c number of insertions and withdrawals with a constant low electrical resistance. Another requirement is a low friction force. In the last years the importance of this demand has considerably increased. The number of pins per connector increased because of miniaturization and integration. Since the insertion and withdrawal forces are the sum of the force per pin, the total forces increased equally. A mathematical analysis of the coef?cient of friction for hemispherical and cylindrical geometries is given. Experimental results con?rm the theoretical considerations.
2016 Elsevier B.V. All rights reserved.
1. Introduction
Electrical contacts have to ensure a secure connection with a low electrical resistance. Geometry, material and contact force are the most important factors of in?uence in relation to the electrical resistance [1]. The choice of the ideal coating and contact parameters is crucial for the development of successful product. An often used contact concept for electrical connectors is the combination of a rider and a ?at contact. Commonly used geometries for the contact area are hemispherical and cylindrical geometries (Fig. 1). The contact force is us
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