We investigate the evolution of heterogeneous stress states along frictional interfaces. Using finite-element simulations, we model the occurrence of precursory slip sequences on a deformable-deformable as well as a deformable–rigid interface between two solids. Every interface rupture creates a stress concentration at its arrest position and erases the stress concentrations produced by previou...

Chaotic oscillators with Coulomb-type friction were extensively studied in the past. However, these investigations mostly deal with rather complex mechanical models that are closely related to everyday’s engineering applications. In the present paper, we introduce a stick-slip oscillator consisting only of a spring and a block sliding on a rough surface, and the block is periodically forced. A ...

0039-6028/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.susc.2009.06.022 * Corresponding author. Address: Department of Me University, 110 Cummington Street, Boston, MA 0221 358 4406; fax: +1 617 353 5866. E-mail address: [email protected] (Y. Zhang). Molecular dynamics simulations were performed to study the friction between hydroxylated aAl2O3(0 0 0 1) surfaces at the temperature of 300 ...

Current address – Department of Industrial Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53201 † Corresponding author – [email protected] Tel: (414) 229-3377 ABSTRACT Surface texture influences friction during sliding contact conditions. In the present investigation, the effect of surface texture of soft materials on friction during sliding against hard materials was studied usin...

Despite the emphasis it now receives in the marketing of self-ligating brackets, friction is not the major component of resistance to sliding in clinical treatment. Laboratory studies show that binding of the wire against the corners of the bracket, which occurs soon after tooth movement begins, is much more important than previously thought, and that notching of the archwire, which temporarily...

Modulations of the friction force in dry solid friction are usually attributed to macroscopic stick-slip instabilities. Here we show that a distinct, quasistatic mechanism can also lead to nearly periodic force oscillations during sliding contact between an elastomer patterned with parallel grooves, and abraded glass slides. The dominant oscillation frequency is set by the ratio between the sli...

We present an extensive experimental study and scaling analysis of friction of gelatin gels on glass. At low driving velocities, sliding occurs via propagation of periodic self-healing slip pulses whose velocity is limited by collective diffusion of the gel network. Healing can be attributed to a frictional instability occurring at the slip velocity V=Vc. For V>Vc, sliding is homogeneous and fr...

Friction and wear tests were performed on AISI 1045 steel specimens with different initial roughness parameters, machined by a creep-feed dry grinding process, to study the friction and wear behavior on a pin-on-disc tester in dry sliding conditions. Average surface roughness (Ra), root mean square (Rq), skewness (Rsk) and kurtosis (Rku) were involved in order to analyse the influence of the fr...

synopsis A simple calculation gives, to a first approximation, the ,influence of sliding friction on the motion of a top, spinning on a horizontal plane. For a spherical body with axially symmetric mass distribution two effect are found : 1. The centre of gravity will be lifted if it lies eccentric in the sphere; 2. the axis with the greatest moment of inertia moves towards the vertical, if the...

B.N.J. Persson and E. Tosatti 1 Institut für Festkörperforschung, Forschungszentrum Jülich, D–52425 Jülich, Germany International School for Advanced Studies (SISSA), Via Beirut 2, I-34014 Trieste, Italy, and Istituto Nazionale di Fisica della Materia (INFM), Trieste, (Italy), and Abdus Salam International Center for Theoretical Physics (ASICTP), P.O. Box 586, I-34014 Trieste, Italy ABSTRACT In...