Calculation of the wear surface and the coefficient of friction for various coated contact geometries

The scope of this work is the calculation of a coefficient of friction as a function of wear cycles for a degrading coated contact. The coating system guarantees a specific number of insertions and withdrawals with a constant low electrical resistance. Another requirement is a low friction force. In the last years the importance of this demand has considerably increased. The number of pins per connector increased because of miniaturization and integration. Since the insertion and withdrawal forces are the sum of the force per pin, the total forces increased equally. A mathematical analysis of the coefficient of friction for hemispherical and cylindrical geometries is given. Experimental results confirm the theoretical considerations.