Title :
Experimental study of the conducting spots in aluminum contact interfaces
Author :
Runde, Magne ; Hodne, Elin ; Tøtdal, Bård
Author_Institution :
Norwegian Electr. Power Res. Inst., Trondheim, Norway
fDate :
12/1/1990 12:00:00 AM
Abstract :
Experimental results from a study of contact spots in aluminum-aluminum interfaces that have passed heavy direct currents are reported. The size, shape and appearance of the spot fractures were found to be correlated to the surface roughness and to the recorded voltage and resistance characteristics. Rough contact surfaces caused irregularly shaped contact spots to develop, while high and unstable resistances were always associated with large contact spots. The latter observation indicates that the electrical conductivity of the contact spots has been reduced by the electrical stresses
Keywords :
aluminium; crack detection; electrical conductivity of crystalline metals and alloys; electrical contacts; mechanical contact; surface topography; Al contact interfaces; Al-Al interfaces; conducting spots; contact spots; electrical conductivity; electrical resistance; electrical stresses; fracture shape; fracture size; irregularly shaped contact spots; rough contact surfaces; spot fractures; surface roughness; voltage; Aluminum; Conductivity; Contacts; Electric resistance; Rough surfaces; Shape; Surface cracks; Surface resistance; Surface roughness; Voltage;
Journal_Title :
Components, Hybrids, and Manufacturing Technology, IEEE Transactions on
