Meniscus Instability in a Thin Elastic Film

Ghatak, Ajoy; Chaudhury, Manoj K.; Shenoy, Vijay B.; Sharma, Ashutosh

doi:10.1103/physrevlett.85.4329

Cited by 187 publications

(244 citation statements)

References 14 publications

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“…The peeling front shows a distinctive fingering pattern, which is reminiscent of Saffman-Taylor instabilities for liquids [16][17][18] or elastic instabilities for soft solids. 19,20 These fingering instabilities of the peel front are then associated with extensive deformation and orientation of the polymer chains in the direction of the motion of the shear device. This type of deformation is analogous although slightly different to what is observed in 908 peel tests of PSA, described as fibrillation.…”

Section: In-situ Visualization Of Failure Mechanisms Under Steady Stamentioning

confidence: 99%

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Sosson

Chateauminois

Creton

2005

J Polym Sci B Polym Phys

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We report new experiments investigating the failure mechanisms in shear, of thin layers of acrylic pressure-sensitive adhesives (PSA). We have developed a novel experimental device able to shear a soft adhesive layer confined between a rigid hemispherical lens and a rigid glass substrate. Using the resources of in situ contact visualization, the nonhomogeneous deformation of the layer and the shear failure processes were observed optically. Depending on the rheological properties of the adhesive, ratios of the contact radius over the layer thickness of 10-30 were achieved, mimicking well the contact conditions encountered in a thin adhesive layer within a joint. When the adhesive was weakly crosslinked, we observed a fluid-like behavior and could measure a reasonable value for the viscosity of the PSA, implying that flow can occur in the layer and failure will occur by creep. On the other hand, for a more crosslinked adhesive, closer to what is used in applications, a stick-slip peeling behavior was observed, which involves a coupling between peeling mechanisms at the leading edge of the contact and interfacial slippage. Such a process suggests a failure by fracture rather than by creep. Interestingly, the peeling mechanisms and the associated stress levels change significantly when the layer becomes as thin as 20 lm, implying a fracture process that is controlled by a critical energy release rate in shear G IIc rather than by a critical shear stress causing failure of the interfacial bonds.

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Section: In-situ Visualization Of Failure Mechanisms Under Steady Stamentioning

confidence: 99%

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Sosson

Chateauminois

Creton

2005

J Polym Sci B Polym Phys

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“…High aspect ratio of such systems is noteworthy as the lateral length scale far exceeds the thickness of the film resulting in high degree of confinement for the adhesive. As a result, adhesive stresses at the interface does not always result in uniform deformation through out the whole area of contact, rather spatially varying deformations (Gent et al 1958, Gent et al 1969, Ghatak et al 2000, Mönch et al 2001 attain lower energy for the system. Experimentally we see the existence of a critical thickness of the film or a critical curvature of the flexible plate below which the contact line between the film and the flexible plate does not remain straight, but turns undulatory with a characteristic wavelength which increases linearly with the thickness of the film (Ghatak et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Confinement-induced instability of thin elastic film

Ghatak

2006

Phys. Rev. E

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A confined incompressible elastic film does not deform uniformly when subjected to adhesive interfacial stresses but with undulations which have a characteristic wavelength scaling linearly with the thickness of the film. In the classical peel geometry, undulations appear along the contact line below a critical film thickness or below a critical curvature of the plate. Perturbation analysis of the stress equilibrium equations shows that for a critically confined film the total excess energy indeed attains a minima for a finite amplitude of the perturbations which grow with further increase in the confinement.

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“…Concomitantly, bubbles are formed (Ghatak & Chaudhury 2003;Ghatak et al 2004) just behind the film edge (figure 1), which grow and coalesce to form two viable cracks. When one of these cracks is annihilated at the free edge of the film, the applied moment drops, as the other crack continues to propagate on the smooth part of the film accompanied with a wavy undulation (Ghatak et al 2000) of the contact line.…”

mentioning

confidence: 99%

Roles of discontinuities in bio-inspired adhesive pads

Chung

Chaudhury

2005

J. R. Soc. Interface.

185

163

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Morphological intricacies of the biological attachment pads generate considerable interest owing to their remarkable ability to control adhesion to various surfaces. Motivated by the adhesive microstructures of insects, we examine the behaviour of adhesion and crack propagation in patterned adhesive films. These films are made of silicone elastomers that were patterned with lateral, longitudinal or crosswise incisions from which a thin silanized glass plate was removed in a displacement-controlled peel experiment. The behaviours of crack propagation on these patterned adhesive films are controlled by simple incision patterns, their depths and spacing. With the crosswise incisions, significant enhancement (!10-20) of fracture energy has been achieved. These findings point towards an important mechanism by which of biological organisms might enhance adhesion, and provide a simple design principle for manipulating the interfacial fracture in a variety of artificial attachment devices.

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Meniscus Instability in a Thin Elastic Film

Cited by 187 publications

References 14 publications

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Confinement-induced instability of thin elastic film

Roles of discontinuities in bio-inspired adhesive pads

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