Study of vibration transfer in automotive connectors for understanding of fretting corrosion damage
Résumé
Fretting corrosion damage is caused by a relative motion of contact pairs surfaces subjected to external mechanical vibrations. Indeed, global mechanical excitation on a whole connector may cause relative displacement on contact area and then to fretting degradation. This work experimentally investigates the global relative motion in 1-way automotive connectors with many components (11 parts). Therefore, a methodology is presented, that allows to study the whole connector movement in order to analyze the relative influence on connector components. To understand the fretting degradation at the actual contact interface, a test bench and a methodology were set up to perform these relative motion measurements using a 3D laser vibrometer. We first focus to understand induced motion through different connector components from wires to male and female terminals as well as male and female holdings motions caused by vibrations. Then the whole connector relative movements were deduced from the measured displacements in three-dimensions, on components such as housing, terminals and wire. Furthermore, the experiment results were compared with the frequency response, obtained from modal analysis modeling. So, from the previous comparison, the specific damaged frequencies domains were detected. Finally, the relative displacements of the electrical contact zone are deduced and if effectively fretting corrosion may appear.
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