Static friction in shearingmode can be expressed as the product of the shearstrenght of the interface and the real contact area.The influence of roughness on friction in elastic adhesion contact is analyzed.The effect of adheison is inclouded using Maugis'expansion of the Greenwood and Williamson model.Special attention is paid to low loading conditions,in which the number of contact poitns is small and the statistical models fail.A discrete contact model is proposed for this regime.The models areused to analyze friction experiments in a MEMS fricton mether.The measured friction force as a function of the load can be explained by the discrete contact model,assuming three contact points.
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