Investigation on Contact Behaviors Exhibited by Non-Gaussian Rough Surfaces

In mechanical systems, the machining surfaces of various components, especially those subjected to precision machining such as the roller and track surfaces in feed systems, often exhibit non-Gaussian roughness characteristics, which significantly differ from the Gaussian surface model widely adopted in traditional contact models. In order to thoroughly investigate the influence mechanism of characteristic parameters of non-Gaussian rough surfaces on the contact performance of mechanical interfaces, this study specifically constructs a contact model for non-Gaussian rough surfaces. This model elaborately elucidates the complex effects of skewness and kurtosis, two key parameters, on contact force, actual contact area, and contact stiffness. Thus, it deepens the understanding of contact characteristics of non-Gaussian rough surfaces and provides a theoretical basis for the analysis and optimization of the contact performance between rollers and tracks in feed systems.