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Monday, July 8 • 15:30 - 15:50
VIBRATION ANALYSIS OF ELECTRICAL CONNECTOR UNDER DIFFERENT AMBIENT CONDITIONS

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In automotive field, vehicle vibrations induce movement on hundreds of connectors which are located near the engine or inside the vehicle compartment. These vibrations produce induced-frictions between male and female parts in contact inside the connector (named pin and clip respectively) and generate electrical failure due to the well-known fretting-corrosion phenomenon. A relative displacement of 5 micrometers between the pin and the clip is sufficient to generate debris at the contact zone and lead to an intermittent conduction at this interface which represents 60 % of electrical failure within a car. Connectors are made of a substrate of copper alloy plated with a tin layer. Tin is used to coat and protect the copper substrate. The oxygen reacts with the soft tin and formed a hard and brittle layer of tin debris and cause high degradations. This third-body layer is composed of insulated (oxide) and conductive debris (non-oxides). The electrical conduction could be disturbed through this granular layer. The displacement and evacuation of oxidized debris is not so well understand. For our study, an automotive connector was submitted to vibration tests. The used bench is composed of a piezo-electric actuator which provides a controlled movement between the clip and the pin. A generator provides a stable current through the connector and the measurement were performed with a voltmeter, a temperature controller and an oscilloscope for real-time analysis. The bench is mounted on an anti-vibration table in order to avoid external vibrations. The measurement of electrical behavior was undertaken under two atmospheres: air and nitrogen gas. The use of air atmosphere shows a typical augmentation of the amplitude of the contact voltage whereas the use of nitrogen gas induces a contact voltage decrease. The measurement of these electrical characteristics provides new information to understand the fretting-corrosion phenomena.

Moderators
LH

Lars Håkansson

professor, Linnaeus University
TK

Triantafillos Koukoulas

Dr, Korea Research Institute of Standards and Science

Authors

Monday July 8, 2019 15:30 - 15:50 EDT
Westmount 2
  T01 Ac. meas. & instrum., RS02 Measur techniq & sens

Attendees (5)