中国物理B ›› 2023, Vol. 32 ›› Issue (4): 44602-044602.doi: 10.1088/1674-1056/ac9043

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Micro sliding friction model considering periodic variation stress distribution of contact surface and experimental verification

Sheng-Hao Lu(卢晟昊), Jing-Yu Han(韩靖宇), and Shao-Ze Yan(阎绍泽)†   

  1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
  • 收稿日期:2022-06-16 修回日期:2022-08-26 接受日期:2022-09-08 出版日期:2023-03-10 发布日期:2023-04-04
  • 通讯作者: Shao-Ze Yan E-mail:yansz@mail.tsinghua.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11872033) and the Beijing Natural Science Foundation, China (Grant No. 3172017).

Micro sliding friction model considering periodic variation stress distribution of contact surface and experimental verification

Sheng-Hao Lu(卢晟昊), Jing-Yu Han(韩靖宇), and Shao-Ze Yan(阎绍泽)†   

  1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2022-06-16 Revised:2022-08-26 Accepted:2022-09-08 Online:2023-03-10 Published:2023-04-04
  • Contact: Shao-Ze Yan E-mail:yansz@mail.tsinghua.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11872033) and the Beijing Natural Science Foundation, China (Grant No. 3172017).

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摘要： Micro sliding phenomenon widely exists in the operation process of mechanical systems, and the micro sliding friction mechanism is always a research hotspot. In this work, based on the total reflection method, a measuring device for interface contact behavior under two-dimensional (2D) vibration is built. The stress distribution is characterized by the light intensity distribution of the contact image, and the interface contact behavior in the 2D vibration process is studied. It is found that the vibration angle of the normal direction of the contact surface and its fluctuation affect the interface friction coefficient, the tangential stiffness, and the fluctuation amplitude of the stress distribution. Then they will affect the change of friction state and energy dissipation in the process of micro sliding. Further, an improved micro sliding friction model is proposed based on the experimental analysis, with the nonlinear change of contact parameters caused by the normal contact stress distribution fluctuation taken into account. This model considers the interface tangential stiffness fluctuation, friction coefficient hysteresis, and stress distribution fluctuation, whose simulation results are consistent well with the experimental results. It is found that considering the nonlinear effect of a certain contact parameter alone may bring a greater error to the prediction of friction behavior. Only by integrating multiple contact parameters can the accuracy of friction prediction is improved.

关键词: periodic variation stress distribution, micro sliding friction model, tangential stiffness, experimental analysis, stick-slip

Abstract: Micro sliding phenomenon widely exists in the operation process of mechanical systems, and the micro sliding friction mechanism is always a research hotspot. In this work, based on the total reflection method, a measuring device for interface contact behavior under two-dimensional (2D) vibration is built. The stress distribution is characterized by the light intensity distribution of the contact image, and the interface contact behavior in the 2D vibration process is studied. It is found that the vibration angle of the normal direction of the contact surface and its fluctuation affect the interface friction coefficient, the tangential stiffness, and the fluctuation amplitude of the stress distribution. Then they will affect the change of friction state and energy dissipation in the process of micro sliding. Further, an improved micro sliding friction model is proposed based on the experimental analysis, with the nonlinear change of contact parameters caused by the normal contact stress distribution fluctuation taken into account. This model considers the interface tangential stiffness fluctuation, friction coefficient hysteresis, and stress distribution fluctuation, whose simulation results are consistent well with the experimental results. It is found that considering the nonlinear effect of a certain contact parameter alone may bring a greater error to the prediction of friction behavior. Only by integrating multiple contact parameters can the accuracy of friction prediction is improved.

Key words: periodic variation stress distribution, micro sliding friction model, tangential stiffness, experimental analysis, stick-slip

中图分类号:  (Tribology and mechanical contacts)

  • 46.55.+d
42.30.Va (Image forming and processing) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))