Direct Observation of Cavitation and Fibrillation in a Probe Tack Experiment on Model Acrylic Pressure-Sensitive-Adhesives

Lakrout, Hamed; Sergot, P.; Creton, Costantino

doi:10.1080/00218469908017233

Cited by 333 publications

(420 citation statements)

References 33 publications

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“…Cavitation requires that bonds within the material be ruptured, or that adhesive failure occur at the interface between the elastic layer and one of the confining surfaces. Cavitation dominates the behavior for very large values of a͞h, both for purely elastic solids [11] and for more viscoelastic pressure sensitive adhesives [12,13]. Also, while we have shown that fingering instabilities do occur in purely elastic materials, some flow or yielding will still play a role in many practical situations.…”

Section: (Received 28 September 1999)mentioning

confidence: 99%

Fingering Instabilities of Confined Elastic Layers in Tension

2000

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Section: (Received 28 September 1999)mentioning

confidence: 99%

Fingering Instabilities of Confined Elastic Layers in Tension

2000

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“…[5][6][7][8][9] Following these advances, Lindner and Maevis 10 have studied the failure over time of acrylic PSA layers loaded to the subcritical stress level that does not cause immediate failure. Interestingly, they found that the failure under low load did not occur by a progressive creep of the adhesive but by the nucleation of cavities and their progressive growth.…”

Section: Introductionmentioning

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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“…To study the coupling of the bulk and interfacial properties that govern the failure of these layers, a variety of test geometries have been used. Among the more common test geometries are the peel test, [4][5][6] the spherical ͑Johnson-Kendall-Roberts, or JKR͒ or flat ͑probe tack͒ techniques, [7][8][9][10] and nanoprobe techniques ͓atomic force microscopy ͑AFM͒, nanoidentation͔. 11,12 Illustrative schematics of the peel test and two of the probe geometries are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Deformation and failure modes of adhesively bonded elastic layers

Crosby¹,

Shull²,

Lakrout

et al. 2000

Journal of Applied Physics

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214

202

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Adhesively bonded elastic layers with thicknesses that are small relative to their lateral dimensions are used in a wide variety of applications. The mechanical response of the compliant layer when a normal stress is imposed across its thickness is determined by the effects of lateral constraints, which are characterized by the ratio of the lateral dimensions of the layer to its thickness. From this degree of confinement and from the material properties of the compliant layer, we predict three distinct deformation modes: ͑1͒ edge crack propagation, ͑2͒ internal crack propagation, and ͑3͒ cavitation. The conditions conductive for each mode are presented in the form of a deformation map developed from fracture mechanics and bulk instability criteria. We use experimental data from elastic and viscoelastic materials to illustrate the predictions of this deformation map. We also discuss the evolution of the deformation to large strains, where nonlinear effects such as fibrillation and yielding dominate the failure process.

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Direct Observation of Cavitation and Fibrillation in a Probe Tack Experiment on Model Acrylic Pressure-Sensitive-Adhesives

Cited by 333 publications

References 33 publications

Fingering Instabilities of Confined Elastic Layers in Tension

Fingering Instabilities of Confined Elastic Layers in Tension

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Deformation and failure modes of adhesively bonded elastic layers

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