We calculate the friction force acting on a hard cylinder or spherical ball rolling on a flat surface of a viscoelastic solid. The rolling-friction coefficient depends non-linearly on the normal load and the rolling velocity. For a cylinder rolling on a viscoelastic solid characterized by a single relaxation time Hunter has obtained an exact result for the rolling friction, and our result is in...

Strip tearing during cold rolling process has always been considered among the main concerns for steel companies, while several works have been done so far regarding the examination of this issue. In this paper, experimental data from cold rolling tandem mill is used for detecting strip tearing. Sensors are placed across the cold rolling tandem mill, to collect information on parameters (such a...

for helpful discussions and comments, and to Pam Dillon and Paula Drew for assistance in preparing this document. The views expressed are those of the authors and should not be attributed to the Reserve Bank of Australia.

Selectin-mediated cell adhesion is an essential component of the inflammatory response. In an attempt to unambiguously identify molecular features of ligands that are necessary to support rolling adhesion on P-selectin, we have used a reconstituted ("cell-free") system in which ligand-coated beads are perfused over soluble P-selectin surfaces. We find that beads coated with the saccharides sial...

Leukocyte recruitment into inflammatory sites is initiated by a reversible transient adhesive contact with the endothelium called leukocyte rolling, which is thought to be mediated by the selectin family of adhesion molecules. Selectin-mediated rolling precedes inflammatory cell emigration, which is significantly impaired in both P- and L-selectin gene-deficient mice. We report here that approx...

Leukocyte rolling has been postulated to be mandatory for subsequent leukocyte adhesion and tissue injury observed during ischemia/reperfusion. The objective of this study was to systematically assess this hypothesis at the microvascular level by examining the effects of various concentrations of a selectin-binding carbohydrate (fucoidin) on the increased rolling and adhesion of leukocytes in p...

The outer surface of the tube is worn under interaction between velocity difference and rolling pressure, in process circular into a rectangular tube. In order to predict wear depth, according characteristics roll forming, causes forming are analyzed. finite element model was established based on Archard theory, 40 mm × 27.5 3 SUS304 stainless steel simulated. simulated results were compared wi...

Flexible Roll Forming (FRF) allows the forming of components with a variable cross section along length component. However, process has only limited application in automotive industry due to wrinkling flange which currently prevents high strength steels and limits part shape complexity. This paper presents new technology, Incremental Shape Rolling (ISR), where pre-cut blank is clamped between t...

Abstract Bistable metal sheets with a coiled transport geometry and an unfolded profile as second stable state, are of great interest lightweight components. It is well known that specific distribution residual stresses necessary to enable bistable properties. With the help numerical FE models, optimal process parameters for production such evaluated. Afterwards, incremental bending roll formin...

The mechanical rolling conditions in hot strip mills are precisely defined by various variables, which are taken directly froth the rolling schedule (separation force, torque. speed. strip thickness) or calculated from figures of the rolling schedule and dimensions of the mill (strip reduction, roll diameter etc.). These variables allow to describe the mechanical rolling conditions of all passe...