Chemical aging of large-scale randomly rough frictional contacts.

@article{Li2018ChemicalAO,
  title={Chemical aging of large-scale randomly rough frictional contacts.},
  author={Zhuohan Li and Lars Pastewka and Izabela Szlufarska},
  journal={Physical review. E},
  year={2018},
  volume={98 2-1},
  pages={
          023001
        }
}
It has been shown that contact aging due to chemical reactions in single asperity contacts can have a significant effect on friction. However, it is currently unknown how chemically induced contact aging of friction depends on roughness that is typically encountered in macroscopic rough contacts. Here we develop an approach that brings together a kinetic Monte Carlo model of chemical aging with a contact mechanics model of rough surfaces based on the boundary element method to determine theโ€ฆย 
Load-velocity-temperature relationship in frictional response of microscopic contacts
Frictional properties of interfaces with dynamic chemical bonds have been the subject of intensive experimental investigation and modeling, as it provides important insights into the molecular originโ€ฆ
Length Scale Effect in Frictional Aging of Silica Contacts.
TLDR
Frictional aging, the key manifestation of the evolutional behavior, of silica-silica contacts is studied via slide-hold-slide tests with apparent contact size spanning across 3 orders of magnitude, and a clear and strong length scale dependency in frictional aging characteristics is demonstrated.
Adhesive wear mechanisms in the presence of weak interfaces: Insights from an amorphous model system
Engineering wear models are generally empirical and lack connections to the physical processes of debris generation at the nanoscale to microscale. Here, we thus analyze wear particle formation forโ€ฆ
Memory Distance for Interfacial Chemical Bond-Induced Friction at the Nanoscale.
TLDR
A physically based kinetic model for the nanoscale memory effect, the "activation-passivation loop" model, is proposed, which accounts for the activation and passivation of chemical reaction sites and the formation of new chemical bonds from dangling bonds during sliding.
Contact and macroscopic ageing in colloidal suspensions
TLDR
The progressive stiffening of the solidโ€“solid contacts that freeze dense colloidal suspensions are shown to cause the macroscopic ageing of such materials, thus questioning the understanding of ageing dynamics in these systems.
Load and Velocity Dependence of Friction Mediated by Dynamics of Interfacial Contacts.
TLDR
This work revisits the load dependence of interfacial chemical-bond-induced (ICBI) friction experimentally and finds that the velocity dependence of friction can be reversed by changing the normal load.
Physical Origin of the Mechanochemical Coupling at Interfaces.
TLDR
The results indicate that the large range of activation volumes measured in the previous experiments even for the same material system might originate from the different degrees of contributions probed from the bulk vs interface.
An ultrafast quartz crystal microbalance based on a frequency comb approach delivers sub-millisecond time resolution.
TLDR
A design of an ultrafast QCMD with submillisecond time resolution is presented, based on a frequency comb approach applied to a high-fundamental-frequency resonator through a multifrequency lock-in amplifier.
Stochastic properties of static friction
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 frictionโ€ฆ

References

SHOWING 1-10 OF 146 REFERENCES
Multiphysics model of chemical aging in frictional contacts
An increase of static friction during stationary contacts of two solids due to interfacial chemical bonding has been reported in multiple experiments. However, the physics underlying such frictionalโ€ฆ
Load and Time Dependence of Interfacial Chemical Bond-Induced Friction at the Nanoscale.
TLDR
This work shows that for nanoscale ICBI friction of silica-silica interfaces, aging increases approximately linearly with the product of the normal load and the log of the hold time, which implies that the average pressure, and thus the average bond formation rate, is load independent within the accessible load range.
Chemical origins of frictional aging.
TLDR
This work discovers molecular mechanisms that can lead to a logarithmic increase of friction based purely on interfacial chemistry and predicts of the model are consistent with published experimental data on the friction of silica.
Friction laws at the nanoscale
TLDR
It is demonstrated that the breakdown of continuum mechanics can be understood as a result of the rough (multi-asperity) nature of the contact, and that roughness theories of friction can be applied at the nanoscale.
Frictional ageing from interfacial bonding and the origins of rate and state friction
TLDR
The results of atomic force microscopy experiments are presented that show that frictional ageing arises from the formation of interfacial chemical bonds, and the large magnitude of ageing at the nanometre scale is quantitatively consistent with what is required to explain observations in macroscopic rock friction experiments.
Contact between rough surfaces and a criterion for macroscopic adhesion
TLDR
A parameter-free analytic theory is presented that describes changes in these numerical results over up to five orders of magnitude in load, explaining why most macroscopic surfaces do not stick and relates the threshold adhesive strength to roughness and material properties.
Universal Aging Mechanism for Static and Sliding Friction of Metallic Nanoparticles.
TLDR
This work shows experimental evidence of stick-slip friction for nanoparticles sliding on graphite over a wide dynamic range and can assign defined periods of aging to the stick phases of the particles, which agree with simulations explicitly including contact aging.
The evolving quality of frictional contact with graphene
TLDR
Atomistic simulations reproduce the experimental observations of layer-dependent friction and transient frictional strengthening on graphene and reveal that the evolution of static friction is a manifestation of the natural tendency for thinner and less-constrained graphene to re-adjust its configuration as a direct consequence of its greater flexibility.
Finite element modeling of elasto-plastic contact between rough surfaces
This paper presents a finite element calculation of frictionless, non-adhesive, contact between a rigid plane and an clasto-plastic solid with a self-affine fractal surface. The calculations areโ€ฆ
Influence of contact aging on nanoparticle friction kinetics.
TLDR
Experiments of sliding nanoparticles, where friction is measured as a function of sliding velocity and interface temperature, show complex interdependence with Monte Carlo simulations, in which the energy barrier for contact breaking increases logarithmically with time, at a rate governed by thermal activation.
...
1
2
3
4
5
...