What is it about?

Spherical surface is a typical one broad used in friction pair and its surface roughness needs to be concerned. How to evaluate surface roughness of spherical surface is still an issue. Based on Kåsa fit, we explore a reasonable method for surface roughness of spherical surface.

Featured Image

Why is it important?

Our results show that the evaluated value of surface roughness by Kåsa fit-based procedure only deviated from the actual value by less than 10%, even in the case of considerable fitting parameters’ error (>30%). Also, the Kåsa fit can report a reasonable value of surface roughness with better preservation of shift and rotation motion of the surface profile compared to both linear fit and quadratic polynomial fitting, especially for the curved surface with a short radius.


This procedure based on Kåsa fit can be used in evaluating surface roughness of curved surface with circular arc profile no matter what pose of the object under observed.

Jian Li
Jiangsu University

Read the Original

This page is a summary of: Evaluating surface roughness of curved surface with circular profile based on arithmetic circular arc fitting, AIP Advances, December 2023, American Institute of Physics,
DOI: 10.1063/5.0174008.
You can read the full text:



The following have contributed to this page