Static friction and the dynamics of interfacial rupture

Capozza, Rosario; Urbakh, Michael

doi:10.1103/physrevb.86.085430

Cited by 49 publications

(69 citation statements)

References 39 publications

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“…We point out that, contrary to static friction, kinetic friction is weakly affected by the presence of surface patterning. Figures 6b and 7b show that after the first slip event, corresponding to the rupture of the whole interface, surface stress becomes much less uniform, thereby reducing friction force [24]. This non-uniform distribution of surface stress is not dependent on the density of surface grooves, as displayed in Figs.…”

Section: How Do Grooves Influence the Rupturementioning

confidence: 78%

Effect of Surface Grooves on the Static Friction of an Elastic Slider

Capozza

Pugno

2015

Tribol Lett

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Numerous studies have proved the usefulness of surface patterning for the modification of tribological performances of sliding contacts. Here we investigate the effects of patterning on the tribological properties of a slider over a solid substrate. We show that, depending on the numerical density of surface grooves, the tribological properties can change significantly. A low density of surface patterning leads to a decrease of static friction force, while a higher density weakens this effect. The decrease is related to a non-uniform distribution of surface stress induced by patterning. We believe these findings and approach to be relevant for technological applications and related optimal design.Comment: 15 pages, 7 figure

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Section: How Do Grooves Influence the Rupturementioning

confidence: 78%

Effect of Surface Grooves on the Static Friction of an Elastic Slider

Capozza

Pugno

2015

Tribol Lett

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“…21. The model employed in that work, however, does not take into account the effect of torque induced by the shear force and then the non-uniformity of the pressure at the bottom of the slider, which causes the transition of the precursor slip at l c in ref.…”

Section: Discussionmentioning

confidence: 99%

Novel Friction Law for the Static Friction Force based on Local Precursor Slipping

Katano

Nakano

Otsuki

et al. 2014

Sci Rep

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The sliding of a solid object on a solid substrate requires a shear force that is larger than the maximum static friction force. It is commonly believed that the maximum static friction force is proportional to the loading force and does not depend on the apparent contact area. The ratio of the maximum static friction force to the loading force is called the static friction coefficient µM, which is considered to be a constant. Here, we conduct experiments demonstrating that the static friction force of a slider on a substrate follows a novel friction law under certain conditions. The magnitude of µM decreases as the loading force increases or as the apparent contact area decreases. This behavior is caused by the slip of local precursors before the onset of bulk sliding and is consistent with recent theory. The results of this study will develop novel methods for static friction control.

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“…This model was first introduced by Burridge and Knopoff [22] in the study of the elastic deformation of tectonic plates. Despite its simplicity, the model is still used not only in this field [23][24][25], but also to investigate some aspects of dry friction on elastic surfaces, e.g., the static to dynamic friction transition [26][27][28][29][30], stick-slip behavior [31][32][33], and the role of regular patterning [34].…”

Section: Modelmentioning

confidence: 99%

Static and dynamic friction of hierarchical surfaces

2016

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Hierarchical structures are very common in nature, but only recently have they been systematically studied in materials science, in order to understand the specific effects they can have on the mechanical properties of various systems. Structural hierarchy provides a way to tune and optimize macroscopic mechanical properties starting from simple base constituents and new materials are nowadays designed exploiting this possibility. This can be true also in the field of tribology. In this paper we study the effect of hierarchical patterned surfaces on the static and dynamic friction coefficients of an elastic material. Our results are obtained by means of numerical simulations using a one-dimensional spring-block model, which has previously been used to investigate various aspects of friction. Despite the simplicity of the model, we highlight some possible mechanisms that explain how hierarchical structures can significantly modify the friction coefficients of a material, providing a means to achieve tunability.

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Static friction and the dynamics of interfacial rupture

Cited by 49 publications

References 39 publications

Effect of Surface Grooves on the Static Friction of an Elastic Slider

Effect of Surface Grooves on the Static Friction of an Elastic Slider

Novel Friction Law for the Static Friction Force based on Local Precursor Slipping

Static and dynamic friction of hierarchical surfaces

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