A conclusive demonstration has been provided that the nature of the shearthinning, that affects both film thickness and traction in EHL contacts, follows the ordinary power-law rule that has been described by many empirical models of which Carreau is but one example. This was accomplished by accurate measurements in viscometers of the shear response of a PAO that possesses a very low critical s...

This paper shows how contact curvature can be determined from a single contact with a cylindrical tactile sensor. When the tactile finger touches an unknown smooth convex surface, contact location, principal curvatures, and normal force are determined from a 4 x 4 window of strain measurements. In principle, contact properties can be determined by a linear inverse-filter process, but this appro...

Abstract A model for predicting the dynamic response of a sphere at viscoelastic interface is presented. The based on Hertz contact and in medium. In addition to elastic properties medium size sphere, considers density viscosity medium, damping oscillations due radiation shear waves. can predict not only effects mechanical physical amplitude excitation force displacement, but also these paramet...

In this study we use a novel approach to quantitatively investigate mechanical and interfacial properties of clonal β-cells using AFM-Single Cell Force Spectroscopy (SCFS). MIN6 cells were incubated for 48 h with 0.5 mM Ca(2+) ± the calcimimetic R568 (1 μM). AFM-SCFS adhesion and indentation experiments were performed by using modified tipless cantilevers. Hertz contact model was applied to ana...

A parallel-mechanism-equivalent model for repeatability analysis of an overconstrained kinematic coupling is proposed. An Kelvin-type with one additional support introduced and used method illustration. Contact forces the under a preload are computed Moore-Penrose inverse, deformations obtained using Hertz theory. The equivalently modeled as 7-SPS parallel mechanism, spherical joints which repr...

In the present paper, the problem of low-velocity impact of an elastic sphere against a viscoelastic Timoshenko-type beam is studied considering the extension of its middle surface. The viscoelastic features of the beam out of the contact domain are governed by the standard linear solid model with derivatives of integer order, while within the contact domain the fractional derivative standard l...

We use an harmonic technique to probe the dynamics of a liquid-liquid interface in a capillary. The capillary pressure drop induced by a harmonic displacement of the fluids is recorded as a function of the excitation amplitude and frequency. At low frequency there is an amplitude threshold above which the contact line depins and slides, and this threshold is related to the static hysteresis of ...