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| 100 | 1 | _ | |a Dapp, Wolfgang |0 P:(DE-Juel1)145207 |b 0 |e Corresponding Author |u fzj |
| 245 | _ | _ | |a Contact mechanics of and Reynolds flow through saddle points: On the coalescence of contact patches and the leakage rate through near-critical constrictions |
| 260 | _ | _ | |a Les Ulis |c 2015 |b EDP Sciences |
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| 520 | _ | _ | |a We 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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| 700 | 1 | _ | |a Müser, Martin |0 P:(DE-Juel1)144442 |b 1 |e Corresponding Author |u fzj |
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