Analysis of the Contact Area of Smooth and Rough Surfaces in Contact with Sphere Indenter Using Finite Element Method

Abstract

This paper analyzes the contact area of the contact between a deformable rough surface (smooth and rough) and a hard smooth sphere indenter using finite element method. A method was introduced to generate a three dimensional rough surfaces using Computer Aided Design (CAD) software. The rough surface model was developed based on the surface measurement data, while the smooth surface model was generated from the CAD software. Contact area and contact deformation were analyzed. Results showed that the contact area between rough surface versus sphere and smooth surface versus sphere is different.

Sphere and Random Flat Surface Contact

“…2). The first integral I 1 determines the wellknown roughness support length: (7) where ξ (Z r , c) is a random variable with only two values: then ,…”

“…This type of contact is used in measur-ing instruments, sinus mechanisms, pin-ondisc type tribometer, etc. Similar calculations of sphere and plane contact are also considered in several works [1]- [7], where surface contact is defined as elastic, plastic, and elastic-plastic [8]. Finite element modelling methodology and fractal surface modelling are often used for contact modelling and calculations [9].…”

Effects of Different Post-Treatments on Arc Erosion Resistance of Cold-Sprayed AgC Composite Electric Contact

“…One is the different stress states, as original compressive stress can prevent the structure from loosening [25,26], which will reduce the erosion. The other category is the different surface morphologies that can change the character of the connection between the stationary and movable contacts [27,28]. Figure 8 shows the schematic image of the erosion process influenced by surface morphology.…”

Analysis of sheet surface roughness change under contact with flat and spherical indenters

“…The rough surface of the sheets can be described as the collection of hill and valley or called the "asperity" [1]. Plastic deformation produces qualitative changes in the distribution of local pressures in the contact and the size of connected contact regions [2].…”

“…Real contacting surfaces are rough, leading to the concentration of contact in a cluster of microscopic actual contact areas [3]. In other words, asperity against asperity is the real contact interaction in the engineering surface [1]. In the literature, there are some studies on the simplification of the interactions between the asperity contacts.…”