Investigation of Basic Assumption for Contact Between Spheric Asperities in Rough Surface
Caixia Guo1,2, Feng Gao1,2, Yangsen Mu1,2
1College of Mechanical Engineering, Baoji University of Arts and Sciences, Baoji 721016, China.
Materials (Basel, Switzerland)
|January 11, 2025
Summary
Simplified assumptions for rough surface contact analysis are valid for elastic deformation but require careful consideration in plastic deformation. The lower yield strength is key, with ratios above 3 having minimal impact.
Area of Science:
- Tribology
- Materials Science
- Mechanical Engineering
Background:
- Accurate analysis of rough surface contact is crucial but often relies on simplifying assumptions.
- Approximating asperities as hemispheres with uniform radii and Gaussian height distributions can limit accuracy.
Purpose of the Study:
- To investigate the validity of common assumptions in rough surface contact analysis.
- To determine the conditions under which these assumptions hold true for different deformation regimes.
Main Methods:
- Utilized the finite element method (FEM) to create spherical asperity contact models.
- Compared results from four models with varying radii and materials under different yield strengths.
Main Results:
- Assumptions are fully applicable during elastic deformation.
- In plastic deformation, the lower yield strength of contacting bodies is the primary factor.
- Yield strength ratios between 1.2 and 3 influence plastic contact; ratios > 3 have negligible impact.
Conclusions:
- The study provides a theoretical basis for refining rough surface contact models.
- Identifies the scope of applicability for simplified asperity contact assumptions.
- Highlights the importance of considering yield strength in plastic contact scenarios.
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