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Surface separation in elastoplastic contacts.

A Almqvist1, B N J Persson2,3,4

  • 1Luleå University of Technology, Division of Machine Elements, 97187 Luleå, Sweden.

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Summary
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Plastic deformation smooths rough surfaces, reducing separation between solids. This study introduces a new method within multiscale contact mechanics to predict this effect, validated by simulations.

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Area of Science:

  • Tribology and Surface Engineering
  • Materials Science
  • Mechanical Engineering

Background:

  • Contact mechanics of rough surfaces is vital for predicting friction and wear.
  • Plastic deformation significantly alters surface interactions, complicating contact predictions.
  • Existing models often struggle to accurately capture the effects of plasticity on surface separation.

Purpose of the Study:

  • To investigate the influence of plastic deformation on the surface separation of randomly rough solids.
  • To develop a theoretical framework for predicting contact behavior under plastic deformation.
  • To provide a method for incorporating plastic stiffening effects in contact models.

Main Methods:

  • Utilized Persson's multiscale contact mechanics theory.
  • Developed an iterative smoothing procedure simulating elastoplastic shakedown.
  • Applied elastic formulation to an effective power spectrum accounting for plastic smoothing.
  • Validated theoretical predictions using boundary element method (BEM) simulations.

Main Results:

  • The proposed iterative smoothing procedure accurately predicts average surface separation under plastic deformation.
  • Numerical simulations confirmed good agreement with theoretical predictions.
  • The model successfully accounts for plastic smoothing of rough surfaces.
  • The framework allows for the inclusion of plastic stiffening at large deformations.

Conclusions:

  • Plastic deformation leads to a reduction in surface separation due to smoothing effects.
  • The developed iterative method offers a robust approach to modeling elastoplastic contact.
  • This work enhances the understanding of rough surface interactions under significant plastic strain.