Publication

Numerical Modeling of Rough Contact Interfaces with Trapped Compressive Liquid Pockets

2024

Abstract

The introduced numerical model accounts for scenarios where the lubricant quantity is significant yet discontinuous, leading to the formation of trapped compressible lubricant pockets at the contact interface. Additionally, it incorporates the plastic behavior of solid surfaces through a simple plastic saturation method, enabling comprehensive analysis of contact area, pressure distribution, and variations in the friction coefficient for different lubricant types, densities, and surface roughness levels. Comparison with experiments demonstrates that the developed model can estimate the influence of partial lubrication on the friction coefficients during aluminum sheet deep-drawing. Notably, the study reveals that when the lubricant quantity is insufficient to fill the gap, even minor adjustments in its distribution can affect the friction behavior of aluminum during forming processes.

Official source

https://infoscience.epfl.ch/entities/publication/fee99f47-db1a-4341-b8d7-6d542f28f0c9

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2024

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fee99f47-db1a-4341-b8d7-6d542f28f0c9

About this result

Related concepts (32)

Friction

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction ("stiction") between non-moving surfaces, and kinetic friction between moving surfaces. With the exception of atomic or molecular friction, dry friction generally arises from the interaction of surface features, known as asperities (see Figure 1).

Contact mechanics

Contact mechanics is the study of the deformation of solids that touch each other at one or more points. A central distinction in contact mechanics is between stresses acting perpendicular to the contacting bodies' surfaces (known as normal stress) and frictional stresses acting tangentially between the surfaces (shear stress). Normal contact mechanics or frictionless contact mechanics focuses on normal stresses caused by applied normal forces and by the adhesion present on surfaces in close contact, even if they are clean and dry.

Rolling resistance

Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc., is recovered when the pressure is removed. Two forms of this are hysteresis losses (see below), and permanent (plastic) deformation of the object or the surface (e.g. soil).