Multispot model of contacts based on surface features

A model to account for long-term degradation of stationary contacts is proposed. The model is based on introducing a third level of multispot constrictions on the surface of each asperity. The results of simulating fretting corrosion provided good agreement with existing test data. In the latter case it was found that variation of the basic parameter which represents film breakdown indicates that asperity deformation and film growth are important variables in delaying fretting degradation. This model was also used to provide statistical data on change in resistance, and appears to agree with the often observed increase in variability as contacts degrade