An experimental study is presented to measure the elastic, yielding, and crushing properties of individual particles under compression using substrates made aluminum alloy, stainless steel, sapphire. Carefully selected, highly spherical Ottawa sand 0.75–1.1 mm in nominal diameter were compressed between two smooth substrates, load–deformation curves analyzed by Hertz elastic contact theory deri...

– We have investigated both experimentally and theoretically the spreading behavior of latex particles deposited on solid substrates. These particles, which are composed of cross-linked polymer chains, have an intrinsic elastic modulus. We show that the elasticity must be considered to account for the observed contact angle between the particle and the solid substrate, as measured through atomi...

Abstract The paper studies the initial boundary value problem related to dynamic evolution of an elastic beam interacting with a substrate through elastic-breakable forcing term. This discontinuous interaction is aimed model phenomenon attachment-detachment occurring in adhesion phenomena. We prove existence solutions energy space and exhibit various counterexamples uniqueness. Furthermore we c...

This paper describes a method for evaluating material properties of multi-layered systems and functional gradient materials using data obtained from indentation testing. The measurement data collected from the penetration force-depth curves in the test are employed for identifying elastic moduli of thin films and functional gradient materials. An indentation problem is first analyzed on the bas...

The objective of this study is to explore and compare the mechanical response AlCrSiN coatings deposited on two different substrates, namely, WC-Co cBN. Nano-indentation was used measure hardness elastic modulus coatings, micro-indentation for observing contact damage under Hertzian with monotonic cyclic (fatigue) loads. Microscratch tests were also evaluate strength adhesion between substrates...

In this work the effect of substrate roughness on the adhesion of gecko foot-hair like nano structures as opposed to solid elastic materials is described and models of both synthetic nano-hairs and hair-substrate interaction are developed. First, by combining linear beam theory and geometric constraints, a nonlinear elastic model for the hair is derived. Then it is shown how for a given random ...

We report on the elastic contact between a spherical lens and a patterned substrate, composed of a hexagonal lattice of cylindrical pillars. The stress field and the size of the contact area are obtained by means of numerical methods: a superposition method of discrete pressure elements and an iterative bisection-like method. For small indentations, a transition from a Hertzian to a soft-flat-p...