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@ARTICLE{Xu:1045778,
      author       = {Xu, R. and Zhou, F. and Persson, B. N. J.},
      title        = {{F}riction dynamics: displacement fluctuations during
                      sliding friction},
      journal      = {Soft matter},
      volume       = {},
      issn         = {1744-683X},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2025-03592},
      pages        = {10.1039.D5SM00617A},
      year         = {2025},
      abstract     = {We have investigated the fluctuations (noise) in the
                      positions of rectangular blocks, made from rubber or
                      polymethyl methacrylate (PMMA), sliding on various
                      substrates under constant driving forces. For all systems
                      the power spectra of the noise exhibit large low-frequency
                      regions with power laws, ω−γ, with the exponents γ
                      between 4 and 5. The experimental results are compared to
                      simulations and analytical predictions using three models of
                      interfacial interaction: a spring-block model, an
                      asperity-force model, and a wear-particle model. In the
                      spring-block model, small sub-blocks (representing asperity
                      contact regions) are connected to a larger block via
                      viscoelastic springs and interact with the substrate through
                      forces that fluctuate randomly in both time and magnitude.
                      This model gives a power law with γ = 4, as also observed
                      in experiments when no wear particles can be observed. The
                      asperity-force model assumes a smooth block sliding over a
                      randomly rough substrate, where the force acting on the
                      block fluctuates in time because of fluctuations in the
                      number and size of contact regions. This model predicts a
                      power law with the exponent γ = 6, which disagrees with the
                      experiments. We attribute this discrepancy to the neglect of
                      load redistribution among asperity contacts as they form or
                      disappear. The wear-particle model considers the irregular
                      dynamics of wear particles of varying sizes moving at the
                      interface. This model also predicts power-law power spectra
                      but the exponent depends on two trapping-release probability
                      distributions. If chosen suitably it can reproduce the
                      exponent γ = 5 (which corresponds to 1/f noise in the
                      friction force) observed in some cases.},
      cin          = {PGI-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-1-20110106},
      pnm          = {5211 - Topological Matter (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5211},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {40813755},
      doi          = {10.1039/D5SM00617A},
      url          = {https://juser.fz-juelich.de/record/1045778},
}