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The relationship between surface wear and contact resistance during the fretting of in-vivo electrical contacts

By J.W. McBride


A study of the high frequency intermittency events occurring<br/>during the fretting of contact surfaces used for in-vivo electronic<br/>systems, is presented. The emphasis of the study is to determine<br/>and the relationship between the contact resistance during<br/>the fretting process and to relate this to surface wear, as a function<br/>of the applied force. The emphasis is on fretting experiments in the<br/>crossed rod configuration with a range of contact forces, between<br/>1.75 and 0.05 N.<br/>An established test system and test methodology are used for the<br/>study, but in the paper the additional control of the contact force<br/>and the measurement of the surface wear using a 3-D surface scanning<br/>system is introduced. The level of the applied voltage and current<br/>are critical in defining the intermittency events; in this study<br/>a dry circuit test, with 20 mV and 100 mA supply is used. The results<br/>show that for the materials used, intermittency events occur<br/>during every fretting cycle after an initial settling period; that the<br/>contact force level is directly coupled to the wear in-line with established<br/>theory; and that the minimum contact resistance is linked to<br/>the established relationship with force

Topics: TA, TK
Year: 2008
OAI identifier: oai:eprints.soton.ac.uk:63827
Provided by: e-Prints Soton

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