The CEB static friction model is extended to include asymmetric distributions of asperity heights, using the normalized one-parameter Weibull distribution. The normal contact, tangential (friction), and adhesion forces are calculated for different skewness values, and are used to obtain the static friction coefficient. It is predicted that surfaces with negative skewness experience higher static friction coefficient compared to the Gaussian case, under the same external normal load, which agrees with published data. This effect is magnified for lower external loads, as is commonly encountered in microtribological applications.

Issue Section:
Technical Notes
Keywords:
Weibull distribution, rough surfaces, adhesion
Topics:
Adhesion, Stiction, Surface roughness, Weibull distribution, Friction, Stress
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