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@ARTICLE{Persson:201822,
      author       = {Persson, Bo and Kovalev, A. and Gorb, S. N.},
      title        = {{C}ontact {M}echanics and {F}riction on {D}ry and {W}et
                      {H}uman {S}kin},
      journal      = {Tribology letters},
      volume       = {50},
      number       = {1},
      issn         = {1573-2711},
      address      = {Basel},
      publisher    = {Baltzer},
      reportid     = {FZJ-2015-04116},
      pages        = {17 - 30},
      year         = {2013},
      abstract     = {The surface topography of the human wrist skin is studied
                      using an optical method and the surface roughness power
                      spectrum is obtained. The Persson contact mechanics theory
                      is used to calculate the contact area for different
                      magnifications, for both dry and wet condition of the skin.
                      For dry skin, plastic yielding becomes important and will
                      determine the area of contact observed at the highest
                      magnification. The measured friction coefficient [M.J. Adams
                      et al., Tribol Lett 26:239, 2007] on both dry and wet skin
                      can be explained assuming that a frictional shear stress σf
                      ≈ 15 MPa acts in the area of real contact during sliding.
                      This frictional shear stress is typical for sliding on
                      polymer surfaces, and for thin (nanometer) confined fluid
                      films. The big increase in the friction, which has been
                      observed for glass sliding on wet skin as the skin dries up,
                      can be explained as resulting from the increase in the
                      contact area arising from the attraction of capillary
                      bridges. This effect is predicted to operate as long as the
                      water layer is thinner than ∼14 μm, which is in good
                      agreement with the time period (of order 100 s) over which
                      the enhanced friction is observed (it takes about 100 s for
                      ∼14 μm water to evaporate at $50\%$ relative humidity and
                      at room temperature). We calculate the dependency of the
                      sliding friction coefficient on the sliding speed on
                      lubricated surfaces (Stribeck curve). We show that sliding
                      of a sphere and of a cylinder gives very similar results if
                      the radius and load on the sphere and cylinder are
                      appropriately related. When applied to skin the calculated
                      Stribeck curve is in good agreement with experiment, except
                      that the curve is shifted by one velocity-decade to higher
                      velocities than observed experimentally. We explain this by
                      the role of the skin and underlying tissues viscoelasticity
                      on the contact mechanics},
      cin          = {IAS-1 / PGI-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000316364100003},
      doi          = {10.1007/s11249-012-0053-2},
      url          = {https://juser.fz-juelich.de/record/201822},
}