Direction-dependent adhesion of micro-walls based biomimetic adhesives

Afferrante, L.; Grimaldi, Gioacchino; Demelio, G.; Carbone, Giuseppe

doi:10.1016/j.ijadhadh.2015.05.007

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…In nature, several organisms show enhanced adhesion thanks to hierarchical structures of hairs or setae. For instance, hairy attachment systems of insects, arachnids and reptiles have been intensively studied during the past years, aiming at explaining and possibly mimic their extraordinary adhesive abilities in artificial bio-mimetic devices [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

The multiple V-shaped double peeling of elastic thin films from elastic soft substrates

Menga

Afferrante

Pugno

et al. 2018

Journal of the Mechanics and Physics of Solids

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In this paper, a periodic configuration of V-shaped double peeling process is investigated. Specifically, an elastic thin film is detached from a soft elastic material by applying multiple concentrated loads periodically distributed with spatial periodicity λ. The original Kendall's idea is extended to take into account the change in elastic energy occurring in the substrate when the detachment fronts propagate. The symmetric configuration typical of a V-peeling process causes the energy release rate to be sensitive to the variations of elastic energy stored in the soft substrate. This results in an enhancement of the adhesion strength, because part of the external work required to trigger the peeling mechanism is converted in substrate elastic energy. A key role is played by both spatial periodicity λ and elasticity ratio E/E h , between tape and substrate elastic moduli, in determining the conditions of stable adhesion. Indeed, the presence of multiple peeling fronts determines a modification of the mechanism of interaction, because deformations close to each peeling front are also affected by the stresses related to the other fronts. Results show that the energy release rate depends on the detached length of the tape so that conditions can be established which lead to an increase of the supported load compared to the classical peeling on rigid substrates. Finally, we also find that for any given value of the load per unit length, an optimum value of the wavelength λ exists that maximizes the tolerance of the system, before unstable propagation of the peeling front can occur.

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Section: Introductionmentioning

confidence: 99%

The multiple V-shaped double peeling of elastic thin films from elastic soft substrates

Menga

Afferrante

Pugno

et al. 2018

Journal of the Mechanics and Physics of Solids

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“…To this end it suffices to recall the superior abilities of geckos, lizards, flies, beetles, to move, run and climb all type surfaces however tilted or rough like a cinder block [29][30][31]. Such natural systems and their adhesion control strategies have indeed inspired researchers to provide opportunities for controlling adhesion in engineered systems [32][33][34][35][36][37][38].…”

mentioning

confidence: 99%

Adhesive and adhesiveless contact mechanics of elastic layers on slightly wavy rigid substrates

Menga

Afferrante

Carbone

2016

International Journal of Solids and Structures

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“…The adhesive contact problem between a sphere and a plane has been solved theoretically by Bradley [6], Johnson, Kendall, and Roberts (JKR theory) [7], and Derjaguin, Müller, and Toporov (DMT theory) [8] for different limiting cases. Also, for other contact geometries, solutions have been proposed [9,10,11,12,13,14,15,16], e.g., peeling of a thin film from a rigid substrate [10,14]. Those theories have been successfully applied to many of the above mentioned adhesion problems both in science and technology.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Characterization of Curvature Controlled Adhesive Properties of Bio-Inspired Membranes

et al. 2016

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Some biological systems, such as the tree frog, Litoria caerulea, and the bush-cricket, Tettigonia viridissima, have developed the ability to control adhesion by changing the curvature of their pads. Active control systems of adhesion inspired by these biological models can be very attractive for the development of devices with controllable adhesive properties. In this paper, we present a theory describing the adhesive behavior of an artificial system consisting of an inflatable membrane clamped to a metallic cylinder and filled with air. In such a system, by controlling the internal pressure acting on the membrane, it is possible to modulate the adhesive strength. In particular, an increase of the internal pressure and, hence, the curvature of the membrane, results in a decrease of the pull-off force. Results predicted by the theoretical model are in good agreement with experimental data. The model explains the apparent contradictory results observed for the thick membrane with zero curvature. In fact, in this case, large pull-off forces should be expected, but zero values are measured due to an initial small misalignment between indenter and membrane, which is not possible to control with precision during the experiments. The present model might help to achieve a better understanding of the adhesion behavior of biological systems and of the fingertips that, in a broad sense, may be regarded as shell-like structures.

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Direction-dependent adhesion of micro-walls based biomimetic adhesives

Cited by 11 publications

References 17 publications

The multiple V-shaped double peeling of elastic thin films from elastic soft substrates

The multiple V-shaped double peeling of elastic thin films from elastic soft substrates

Adhesive and adhesiveless contact mechanics of elastic layers on slightly wavy rigid substrates

A Theoretical Characterization of Curvature Controlled Adhesive Properties of Bio-Inspired Membranes

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