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Friction on a Microstructured Elastomer Surface

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Abstract

The friction of microstructured polydimethylsiloxane samples against a glass surface is studied through force measurements and simultaneous optical microscopy. Both average friction forces and the amplitude of stick-slip oscillations are greatly reduced by the structuring. Optical microscopy reveals waves propagating through the contact in connection which stick-slip events. The experimental observations are interpreted with the help of simulations of a spring-block model for which parameters are directly derived from the experiment. Stress gradients across the contact area are found to play an important role for the frictional behavior.

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Acknowledgments

M.U. acknowledges support of German-Israeli Project Cooperation Program (DFG-DIP, KL 1948/1-1, GA 309/10). K.B. and R.B. thank E. Arzt for continuous support of this project. This study was supported by the Deutsche Forschungsgemeinschaft within the European Science Foundation project FANAS.

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Correspondence to Roland Bennewitz.

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Brörmann, K., Barel, I., Urbakh, M. et al. Friction on a Microstructured Elastomer Surface. Tribol Lett 50, 3–15 (2013) doi:10.1007/s11249-012-0044-3

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Keywords

  • Stick-slip
  • Static friction
  • Unlubricated friction
  • Elastomers
  • Stress analysis
  • Optical microscopy