Effect of surface topography upon micro-impact dynamics

Abstract

Often the effect of interactions at nano-scale determines the tribological performance of load bearing contacts. This is particularly the case for lightly loaded conjunctions where a plethora of short range kinetic interactions occur. It is also true of larger load bearing conjunctions where boundary interactions become dominant. At the diminutive scale of fairly smooth surface topography the cumulative discrete interactions give rise to the dominance of boundary effects rather than the bulk micro-scale phenomena, based on continuum mechanics. The integration of the manifold localised discrete interactions into a continuum is the prerequisite to the understanding of characteristic boundary effects, which transcend the physical length scales and affect the key observed system attributes. These are energy efficiency and vibration refinement. This paper strives to present such an approach. It is shown that boundary and near boundary interactions can be adequately described by surface topographical measures, as well the thermodynamic conditions.

Deterministic Simulation of Surface Textures for the Piston Ring/Cylinder Liner System in a Free Piston Linear Engine

“…In view of the new challenges that the energy transition imposes [1], the search for mobility systems with lower friction losses is often linked to individual or combined actions of (i) development and use of materials and coatings that provide lower friction [2,3]; (ii) development and use of new lubricants, for example, new additive packages and/or lower viscosity lubricants [4,5]; and (iii) changes in the topography of the surfaces in contact, aiming at operating in lubrication regimes that result in less friction [6][7][8].…”

Modelling and simulation of surface topography machined by peripheral milling considering tool radial runout and axial drift

“…Some studies have investigated the influence of dynamic effects on surface topography for milling. Mohammadpour et al 17 considered the effect of cutting process dynamics in the prediction of milled surface topography. Shi et al 18 examined the influence of both static and dynamic factors on surface roughness to predict the surface roughness in a face milling operation.…”

Special issue collection on tribology in multi-scale manufacturing

“…This selection problem of functional surfaces for tribological and production purposes has motivated this special issue collection of Surface Topography: Metrology and Properties. The authors have outlined some of the important aspects concerned with surface technology-ranging from the bio-inspired surface design for tribological functions (1, 2), multiscale texturing and patterning of a surface for controlling friction and lubrication (3,4), surface topography effect upon nano-scale friction (5) and micro-impact dynamics (6), to some of the advances that have taken place in recent years for functional surface selection (7) and production (8).…”