Bouzera A.,Rennes Institute of Physics |
Bouzera A.,British Petroleum |
Carvou E.,Rennes Institute of Physics |
Ben Jemaa N.,Rennes Institute of Physics |
And 3 more authors.
Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts | Year: 2010
For automotive applications, the mechanical behaviour of the contact area under vibrations is one of the key factors for connector reliability. Such vibrations are typically in the range of 10-2000Hz and result in displacements of only a few microns, at the contact interface. In the present study, a bench test has been developed to control more representative motions down to 1μm. The objective is to determine the minimum amplitude for fretting-corrosion degradation based on the evolution of contact resistance and to study the effects of the material, the contact force, the coating for these low displacement amplitudes. To obtain the limit of the appearance of fretting, a sub-micrometer incrementing displacement amplitude methodology was applied on high stiffness bench test including a double PZTactuator. It was found that the fretting degradation starts to occur from 2μm to 6μm when the contact force is from 0.5N to 2.5N with a tin coated terminal. Moreover pure copper, tin and nickel have similar amplitude fretting limits while noble metals confirm the absence of fretting up to 10μm amplitude and for a large number of operations (106 cycles). Best fitting of the obtained minimum fretting amplitude data to Mindlin equation is discussed and improved by correcting factor. ©2010 IEEE.