Aluminium alloy composites have been extensively investigated for use in tribo-contact applications, however little detailed literature exists on the sub-surface microstructural evolution as a result of lubricated sliding wear. In this study two un-reinforced alloys (2124 & 5056) and identical alloy composites, reinforced with 15vol.% MoSi2 intermetallic particles were produced by a powder meta...

Ceramic bearing balls are desirable for use in high-temperature and nonlubricative environments because of their ability to retain high mechanical strength and reduced wear. However, because ceramics are brittle, it is very important to inspect ceramic parts for the existence of small (l-10 pm) surface defects. The contact-contact resonant sphere technique has been shown to be able to detect th...

A simple analytical model is built up to account for the interface deformation effect in a spherical atomic force microscopy (AFM)-based quasi-static indentation of living cell covered with pericellular brush. The compression behaviour coat described using Alexander–de Gennes that allows nonlinear deformation. An approximate second-order relation between contact and indenter displacement obtain...

Abstract Adhesion between an elastic body and a smooth, rigid substrate can lead to large tensile stresses them. However, most macroscopic objects are microscopically rough, which strongly suppresses adhesion. A fierce debate has unfolded recently as whether local or global parameters determine the crossover small Here, we report simulations revealing that dependence of pull-off force F n on su...

We report the phase diagram of interpenetrating Hertzian spheres. The Hertz potential is purely repulsive, bounded at zero separation, and decreases monotonically as a power law with exponent 5/2, vanishing at the overlapping threshold. This simple functional describes the elastic interaction of weakly deformable bodies and, therefore, it is a reliable physical model of soft macromolecules, lik...

The ceramic crown structures under occlusal contact are idealized as flat multilayered structures that are deformed under Hertzian contact loading. Those multilayers consist of a crown-like ceramic top layer, an adhesive layer and the dentin-like substrate. Bio-inspired design of the adhesive layer proposed functionally graded multilayers (FGM) that mimic the dentin-enamel junction in natural t...

Railway crossings are an important source of localized ground vibration. Models required for identifying ways to tackle unacceptable levels vibration from existing as well future railway lines. Yet, the use a prediction model that directly allows non-Hertzian wheel-rail contact dynamics and also includes three dimensional calculations response would be computationally expensive. In order reduce...

The problem of a low-velocity normal impact rigid sphere upon an infinite viscoelastic Kirhhoff-Love plate is considered. dynamic behaviour the described by fractional derivative standard linear solid model. parameter defining order governs variation in viscosity plate’s material within contact domain during process. local bearing under sphere’s indentation, as well force are defined via genera...