Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-03-28
J. Phys.: Condens. Matter 20 (2008) 215214
Physics
Condensed Matter
Soft Condensed Matter
15 pages, 23 figures
Scientific paper
10.1088/0953-8984/20/21/215214
We present a molecular dynamics study of the contact between a rigid solid with a randomly rough surface and an elastic block with a flat surface. The numerical calculations mainly focus on the contact area and the interfacial separation from small contact (low load) to full contact (high load). For small load the contact area varies linearly with the load and the interfacial separation depends logarithmically on the load. For high load the contact area approaches the nominal contact area (i.e., complete contact), and the interfacial separation approaches zero. The numerical results have been compared with analytical theory and experimental results. They are in good agreement with each other. The present findings may be very important for soft solids, e.g., rubber, or for very smooth surfaces, where complete contact can be reached at moderate high loads without plastic deformation of the solids.
Persson B. N. J.
Yang Changchun
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