Time dependent static friction force of agar gel-on-glass plate immersed in water

2002 ◽  
Vol 12 (9) ◽  
pp. 319-320
Author(s):  
T. Nitta ◽  
H. Haga ◽  
K. Kawabata
Keyword(s):  
Friction Force ◽  
Waiting Time ◽  
Contact Area ◽  
Glass Plate ◽  
Static Friction ◽  
Time Dependent ◽  
Asperity Contact ◽  
Contact Duration ◽  
Agar Gel ◽  
Static Friction Force

We measured the static friction force of agar gel-on-glass plate in water. The static friction force is independent of the apparent contact area between the agar gel and the glass plate. It increases with waiting time, that is, contact duration prior to motion. The static friction force is represented well by a power law of waiting time. The waiting time dependence is different from those of solid-on-solid systems. These results are discussed, based on asperity contact model.

scholarly journals The static friction force on a rod immersed in granular matter

2003 ◽  
Vol 52 (4) ◽  
pp. 879
Author(s):  
Hu Lin ◽  
Yang Ping ◽  
Xu Ting ◽  
Jiang Yang ◽  
Xu Hai-Jiang ◽  
...  
Keyword(s):  
Friction Force ◽  
Granular Matter ◽  
Static Friction ◽  
Static Friction Force

Junction Growth and Energy Dissipation at the Very Early Stage of Elastic-Plastic Spherical Contact Fretting

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
A. Ovcharenko ◽  
I. Etsion
Keyword(s):  
Energy Dissipation ◽  
Friction Force ◽  
Contact Area ◽  
Early Stage ◽  
Static Friction ◽  
Relative Displacement ◽  
Elastic Plastic ◽  
Perfectly Plastic ◽  
Direct Measurements ◽  
Elastic Perfectly Plastic

The contact area, friction force, and relative displacement evolution at the very early stage of fretting are investigated experimentally. Copper and steel spheres of various diameters are loaded against a hard sapphire flat by a range of normal loads deep into the elastic-plastic regime of deformation. A reciprocating tangential loading is then applied with a maximum loading below the static friction to avoid gross slip. Real-time and in situ direct measurements of the contact area, along with accurate measurements of the friction force and relative displacement, reveal substantial junction growth and energy dissipation mainly in the first loading cycle. The so-called “slip amplitude” is found to be attributed to residual tangential plastic deformation rather than to interfacial slip. Elastic shake-down is observed for the 2.5% hardening steel spheres while plastic shake-down is observed in the case of the elastic perfectly-plastic copper spheres.

scholarly journals The influence of the disorderded substrate potential on static friction force

2012 ◽  
Vol 61 (13) ◽  
pp. 130501
Author(s):  
Yang Yang ◽  
Wang Cang-Long ◽  
Duan Wen-Shan ◽  
Shi Yu-Ren ◽  
Chen Jian-Min
Keyword(s):  
Friction Force ◽  
Static Friction ◽  
Substrate Potential ◽  
Static Friction Force

scholarly journals Studies of maximum static friction force in granular pile with probing rod

2007 ◽  
Vol 56 (4) ◽  
pp. 2318
Author(s):  
Kong Wei-Shu ◽  
Hu Lin ◽  
Du Xue-Neng ◽  
Zhang Xing-Gang ◽  
Wang Wei-Ming ◽  
...  
Keyword(s):  
Friction Force ◽  
Static Friction ◽  
Static Friction Force ◽  
Granular Pile

Contact Mechanics Analysis of a Rubber Piece on a Smooth Plate

2009 ◽  
Author(s):  
Kyosuke Ono
Keyword(s):  
Contact Mechanics ◽  
Elastic Deformation ◽  
Contact Area ◽  
Large Scale ◽  
Glass Plate ◽  
Applied Pressure ◽  
Small Scale ◽  
Asperity Contact ◽  
The Real ◽  
Parameter Values

In order to elucidate contact and friction characteristics of rubbers, numerical analysis of asperity contact mechanics of a rubber piece with a smooth glass plate was carried out on the basis of an asperity contact model that considers van der Waal’s (vdW) pressure. First, by ignoring vdW pressure and the elastic deformation of the mean height surface, asperity contact characteristics were analyzed using the measured Young’s modulus, and surface parameter values that could yield the measured contact area were estimated. Next, asperity contact characteristics were analyzed by considering the vdW pressure and elastic deformation of a rough sphere that is a model of a large-scale asperity having small-scale asperities. It was found that the actual contact area was similar to the measured contact area; this result could not be obtained without assuming an rms asperity height of ∼0.1 μm for the small-scale asperities. It was also found that the friction coefficient decreased with an increase in the applied pressure in the cases where the friction force is proportional to the real area of contact and to the real internal contact pressure.

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