7.3    Fretting

7.3.1    Background

This subject is also discussed in Chapters 5 and 6. An understanding of the mechanisms that contribute to connector degradation is necessary to facilitate the correct selection of contact materials and component designs, and to establish the conditions in which the materials must be used in order to assure reliable performance. One of these contact failure processes is fretting or small amplitude contact movement. The small displacements may range from a few micrometers to as much as 100 μm in electronic connectors [99] and are caused by external vibrations [100] or changing temperature [101], for example, due to differences in the coefficients of thermal expansion of the elements to which mating contacts ...

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