The effect of surface roughness on the adhesion of elastic solids

Details The effect of surface roughness on the adhesion of elastic solids The effect of surface roughness on the adhesion of elastic solids

2001-04-10

arxiv.org/abs/cond-mat/0104180v1

Physics

Condensed Matter

Materials Science

15 pages, 16 figures. Submitted to J. Chem. Phys

Scientific paper

10.1063/1.1398300

We study the influence of surface roughness on the adhesion of elastic solids. Most real surfaces have roughness on many different length scales, and this fact is taken into account in our analysis. We consider in detail the case when the surface roughness can be described as a self affine fractal, and show that when the fractal dimension D_f >2.5, the adhesion force may vanish, or be at least strongly reduced. We consider the block-substrate pull-off force as a function of roughness, and find a partial detachment transition preceding a full detachment one. The theory is in good qualitative agreement with experimental data.

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