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000189218 1001_ $$0P:(DE-Juel1)145207$$aDapp, Wolfgang$$b0$$eCorresponding Author$$ufzj
000189218 245__ $$aContact mechanics of and Reynolds flow through saddle points: On the coalescence of contact patches and the leakage rate through near-critical constrictions
000189218 260__ $$aLes Ulis$$bEDP Sciences$$c2015
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000189218 520__ $$aWe study numerically local models for the mechanical contact between two solids with rough surfaces. When the solids softly touch either through adhesion or by a small normal load L, contact only forms at isolated patches and fluids can pass through the interface. When the load surpasses a threshold value, $L_{\text{c}}$ , adjacent patches coalesce at a critical constriction, i.e., near points where the interfacial separation between the undeformed surfaces forms a saddle point. This process is continuous without adhesion and the interfacial separation near percolation is fully defined by scaling factors and the sign of $L_{\text{c}}-L$ . The scaling leads to a Reynolds flow resistance which diverges as $(L_{\text{c}}-L)^{-\beta}$ with $\beta = 3.45$ . Contact merging and destruction near saddle points become discontinuous when either short-range adhesion or specific short-range repulsion are added to the hard-wall repulsion. These results imply that coalescence and break-up of contact patches can contribute to Coulomb friction and contact aging.
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000189218 7001_ $$0P:(DE-Juel1)144442$$aMüser, Martin$$b1$$eCorresponding Author$$ufzj
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