Influences of microcontact shape on the state of a frictional interface

Pilvelait, Tom; Dillavou, Sam; Rubinstein, Shmuel M.

doi:10.1103/physrevresearch.2.012056

Cited by 14 publications

(10 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface roughness and other local properties directly affect how frictional strength changes depending on slip δ, slip rate ∂ t δ, and state (Rabinowicz, 1995;Pilvelait et al, 2020). This is often modeled in phenomenological rate-and-state friction models (Dieterich, 1979;Ruina, 1983;Rice and Ruina, 1983).…”

Section: Implications Of the Physical Problemmentioning

confidence: 99%

Stochastic Properties of Static Friction

Albertini,

Karrer,

Grigoriu

et al. 2020

Preprint

View full text Add to dashboard Cite

The onset of frictional motion is mediated by rupture-like slip fronts, which nucleate locally and propagate eventually along the entire interface causing global sliding. The static friction coefficient is a macroscopic measure of the applied force at this particular instant when the frictional interface loses stability. However, experimental studies are known to present important scatter in the measurement of static friction; the origin of which remains unexplained.Here, we study the nucleation of local slip at interfaces with slip-weakening friction of random strength and analyze the resulting variability in the measured global strength. Using numerical simulations that solve the elastodynamic equations, we observe that multiple slip patches nucleate simultaneously, many of which are stable and grow only slowly, but one reaches a critical length and starts propagating dynamically. We show that a theoretical criterion based on a static equilibrium solution predicts quantitatively well the onset of frictional sliding. We develop a Monte-Carlo model by adapting the theoretical criterion and pre-computing modal convolution terms, which enables us to run efficiently a large number of samples and to study variability in global strength distribution caused by the stochastic properties of local frictional strength. The results demonstrate that an increasing spatial correlation length on the interface, representing geometric imperfections and roughness, causes lower global static friction. Conversely, smaller correlation length increases the macroscopic strength while its variability decreases. We further show that randomness in local friction properties is insufficient for the existence of systematic precursory slip events. Random or systematic non-uniformity in the driving force, such as potential energy or stress drop, is required for arrested slip fronts. Our model and observations provide a necessary framework for efficient stochastic analysis of macroscopic frictional strength and establish a fundamental basis for probabilistic design criteria for static friction.

show abstract

Section: Implications Of the Physical Problemmentioning

confidence: 99%

Stochastic Properties of Static Friction

Albertini,

Karrer,

Grigoriu

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…One should keep in mind that N 2 shares the same timedependence as f 1 , and that A increases with larger normal force [18]. This indicates a coupled interaction between f 2 , N 2 and A.…”

mentioning

confidence: 91%

“…It is established that the growth of static friction coefficient stems from the creep of asperities between two surfaces, resulting in an observable increase of real contact area A which is generally only a small fraction of the apparent surface area [15,16,19]. Such contacts between asperities are recognized as proxy for frictional force [19,20,29], related by f ∝ A, and can be directly observed to the micrometer scale via optical procedures [18,20]. A schematic setup of our second parallel experiment is shown in Fig.…”

mentioning

confidence: 99%

Aging-induced dynamics for statically indeterminate systems

Lin

Cheng

et al. 2021

Phys. Rev. E

View full text Add to dashboard Cite

Statically indeterminate systems are experimentally demonstrated to be in fact dynamical at the microscopic scale. Take the classic ladder-wall problem, for instance. Depending on the Young's modulus of the wall, it may take up to twenty minutes before its weight saturates. This finding is shown to be shared by other statically indeterminate systems, such as a granule silo and a beam with three support points. We believe that the aging effect is responsible for this surprising phenomenon because it can be correlated with the evolution of microscopic contact area with the wall and floor. Finally, a heuristic and simple method is introduced that can uniquely determine and analytically solve the saturated weight without invoking detailed material properties.

show abstract

“…However, reality is much more complicated. The static friction coefficient s has been reported to vary considerably in the same system [4][5][6]. It notably depends on the time that the surfaces have spent in contact.…”

mentioning

confidence: 99%

Non-monotonic Dynamics in the Onset of Frictional Slip

Farain

Bonn

2022

Tribol Lett

View full text Add to dashboard Cite

The transition from static to dynamic friction is often described as a fracture instability. However, studies on slow sliding processes aimed at understanding frictional instabilities and earthquakes report slow friction transients that are usually explained by empirical rate-and-state formulations. We perform very slow ($$\sim$$ ∼ nm/s) macroscopic-scale sliding experiments and show that the onset of frictional slip is governed by continuous non-monotonic dynamics originating from a competition between contact aging and shear-induced rejuvenation. This allows to describe both our non-monotonic dynamics and the simpler rate-and-state transients with a single evolution equation.

show abstract

Influences of microcontact shape on the state of a frictional interface

Cited by 14 publications

References 30 publications

Stochastic Properties of Static Friction

Stochastic Properties of Static Friction

Aging-induced dynamics for statically indeterminate systems

Non-monotonic Dynamics in the Onset of Frictional Slip

Contact Info

Product

Resources

About