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<p>In present study, in order to examine the dynamic contact behavior of graphite sealing surfaces, a new fractal contact mechanical model is introduced, addressing multi-scale effects and asperity interactions on rough surfaces. First, a contact mechanical model for a single asperity is developed based on its deformation and interaction forces. Next, the model incorporates multi-scale asperity effects and introduces a new area distribution function. By integrating the segment sizes of contact spots at each scale, the contact stiffness, contact area and load on the entire graphite sealing surface are calculated. Validation with experimental data shows that contact characteristics are affected by frequency exponent, morphological parameters, operational conditions, and material properties. Notably, asperities within a frequency exponent range of <i>n</i><sub>1</sub> to <i>n</i><sub>10</sub> significantly impact contact stiffness and load.</p>

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Fractal contact model of rough sealing surface considering interactions and multi-scale effects of asperities

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Zhimin Zhang,
  • Xuexing Ding,
  • Xuhui Wang,
  • Chaojun Deng

摘要

In present study, in order to examine the dynamic contact behavior of graphite sealing surfaces, a new fractal contact mechanical model is introduced, addressing multi-scale effects and asperity interactions on rough surfaces. First, a contact mechanical model for a single asperity is developed based on its deformation and interaction forces. Next, the model incorporates multi-scale asperity effects and introduces a new area distribution function. By integrating the segment sizes of contact spots at each scale, the contact stiffness, contact area and load on the entire graphite sealing surface are calculated. Validation with experimental data shows that contact characteristics are affected by frequency exponent, morphological parameters, operational conditions, and material properties. Notably, asperities within a frequency exponent range of n1 to n10 significantly impact contact stiffness and load.