45 research outputs found
Rubber friction on smooth surfaces
We study the sliding friction for viscoelastic solids, e.g., rubber, on hard
flat substrate surfaces. We consider first the fluctuating shear stress inside
a viscoelastic solid which results from the thermal motion of the atoms or
molecules in the solid. At the nanoscale the thermal fluctuations are very
strong and give rise to stress fluctuations in the MPa-range, which is similar
to the depinning stresses which typically occur at solid-rubber interfaces,
indicating the crucial importance of thermal fluctuations for rubber friction
on smooth surfaces. We develop a detailed model which takes into account the
influence of thermal fluctuations on the depinning of small contact patches
(stress domains) at the rubber-substrate interface. The theory predicts that
the velocity dependence of the macroscopic shear stress has a bell-shaped f
orm, and that the low-velocity side exhibits the same temperature dependence as
the bulk viscoelastic modulus, in qualitative agreement with experimental data.
Finally, we discuss the influence of small-amplitude substrate roughness on
rubber sliding friction.Comment: 14 pages, 16 figure
Bruit rayonne par les machines, modelisation theorique, logiciel de prevision et validation experimentale
Available from INIST (FR), Document Supply Service, under shelf-number : AR 16056 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEMinistere de l'Education Nationale de l'Enseignement Superieur et de la Recherche, 75 - Paris (France)FRFranc
Definition d'un nouveau type de suspension moteur
SIGLECNRS-CDST / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc