Functionalities Affected By 3D Surface Roughness
Average surface roughness helps predict how well two mating components may seal. But texture amplitude distribution as measured by bearing area (Spk/Sk, Svk/Sk), texture spacing (Rsm) and structure complexity (Str, Sal) may describe the sealing surfaces better.
Average roughness, measured by Sa or Ra, may meet specs yet the brake system may still make noise. In some cases the noise has been related to amplitude symmetry (Ssk, Spk/Sk) and surface slope (Sdq).
Developing transmission clutch mechanisms involves many advanced surface texture designs such as precision shot peening. By adjusting the peak heights, valley depths, spacings and other bearing area related parameters (Spk, Sk, Svk) the surfaces may be optimized for frictional characteristics.
Cylinder bores, particularly at "Top Dead Center," may undergo severe wear. Using replication methods and large field of view "stitching" measurements, the complete wear pattern may be measured for wear depth, width, volume and texture changes within the wear scar.
The surface roughness of the metal used to form panels may affect the final paint appearance. The spatial wavelengths and amplitudes comprising the texture may contribute to different issues such as haze, orange peel, waviness, gloss etc.
Components such as bearings, pumps and clutches experience various noise characteristics that are sometimes related to the surface texture and various phenomena such as "stick-slip."
For some polymer film applications it is critical to include small asperities to optimize handling, coating and adhesion properties. Various texture parameters help quantify the asperities, such as Summit Density (Sds) and Summit Curvature (Ssc).
Advanced 3D analysis can show how mating surface interact in close proximity and how they will slide, mate, slip or otherwise fit.
Components such as brakes, steering mechanisms, ball screws, etc. experience varying degrees of vibration that may be related to the surface roughness of the engaging components.