Influence of auto correlation length in mean and actual summit radii based multi asperity Gaussian rough surface contact models

Different Gaussian rough surfaces are considered by varying the auto correlation length. Then, mean summit and actual summit radii based multi asperity contact models are developed. The contact parameters of contact load and contact area are calculated using single asperity contact model results. In high ACL/SL case, at extreme interference, the mean summit and actual summit radii based multi asperity contact models showed 48% and 70% difference in contact area ratio and 30% and 49% difference in contact load ratio respectively. A power law expression is developed to relate the contact load and contact area. A dynamism in elastic-plastic contact states of summits is identified which is discussed in detail too.