Abstract
We investigate, over a wide range of normal loads, the static friction on textile-embedded elastomer surfaces that show hierarchical microstructures tunable by adjusting internal in-plane compressive strains. These microstructures, under compression, comprise small protrusions on textile fibers and surface-buckling-based wrinkles with periodicities on the order of tens and hundreds of microns, respectively. The static-friction coefficients unexpectedly increase under normal loads. This unique property, associated with the transition from partial to almost total contact, depends on both loads and the aspect ratio of the wrinkles. Wrinkle-structure tuning modulates load-dependent friction’s nonlinearity, which may augment the tribological performance of elastomeric materials.
Highlights
Working with the frictional properties[1,2,3] exhibited by soft materials,[4,5,6,7] such as rubber and plastics, has demonstrated great practical importance in many applications, including seals, windshield wipers, and grips on tools, robot hands, and sports equipment
Unique load dependency of static friction of wrinkles formed on textile-embedded elastomer surfaces
Some practical applications of these surfaces depend upon simultaneously considering the efficient detachment process. Functional surfaces, such as grips, show a fundamental need for on-demand tuning of the static, dynamic frictions and adhesion forces. Such tunability may be realized by systems in which some external triggers at a constant normal load vary the friction force; tunability may display nonlinear behavior that depends on normal loads beyond the monotonic normal-load dependency known as Amontons–Coulomb’s law.[1,2,3,4,5,6,7,16,17,18,19,20,21,22]
Summary
Working with the frictional properties[1,2,3] exhibited by soft materials,[4,5,6,7] such as rubber and plastics, has demonstrated great practical importance in many applications, including seals, windshield wipers, and grips on tools, robot hands, and sports equipment. Unique load dependency of static friction of wrinkles formed on textile-embedded elastomer surfaces
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