Micromechanics of flat-probe adhesion tests of soft viscoelastic polymer films

Creton, Costantino; Lakrout, Hamed

doi:10.1002/(sici)1099-0488(20000401)38:7<965::aid-polb7>3.0.co;2-8

Cited by 126 publications

(102 citation statements)

References 34 publications

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“…Above these values, the contact behavior becomes highly sensitive to the compressibility of the polymer layer and numerical simulations show that very small fluctuations in the Poisson's ratio of the adhesive close to the rubbery value (t ¼ 0.5) can result in dramatic changes in the compliance of the film. [13][14][15] Under such conditions, the contact behavior depends on a complex balance between the shear behavior of the layer and its compressibility. In the present experiments, the ratio of the contact radius, a, to the film thickness, h, varied between 5 and 20 depending on film thickness and applied load.…”

Section: Contact Behavior Under Normal Loadingmentioning

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: Contact Behavior Under Normal Loadingmentioning

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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“…Growth of these bulk cavities corresponds to the early stages of fibrillation, which must take place in order for large deformations to be achieved. 9,14,24 In addition to these three main classes of deformation, the following two subclasses, related to the shape of the edge of the compliant layer, can also be defined.…”

Section: Internal Crack Propagation [Fig 2(b)]mentioning

confidence: 99%

“…15 Note that our qualitative treatment does not take into account the shape of the stress distribution, which depends on a/h, the compressibility of the compliant layer, and the radius of curvature of the rigid punch. 14,17,36 Finally, we neglect differences between the hydrostatic stress and the normal stress which become significant at low values of a/h. While these factors affect the detailed response of the system, including the distribution of cavitation or internal crack growth within the contact area, they do not affect the general features of the deformation process.…”

Section: ͑10͒mentioning

confidence: 99%

“…These failure mechanisms can range from simple interfacial fracture to cavitation leading to cohesive failure in a fibrillated structure. 9,[13][14][15][16][17] In all cases, the underlying physics is controlled by the coupling of bulk and interfacial properties of the thin layer. Qualitatively, this coupling has been well described and quantitative advances have been made more recently.…”

Section: Introductionmentioning

confidence: 99%

“…Qualitatively, this coupling has been well described and quantitative advances have been made more recently. 6,13,14,[16][17][18][19][20][21][22][23] More work is still needed, however, to formulate a quantitative link between the overall mechanical performance and the properties of the compliant layer. This quantitative understanding of the bulk and interfacial contributions to performance is not only critical to predicting a products's engineering limits, but can also be used to optimize the design process for adhesive layers.…”

Section: Introductionmentioning

confidence: 99%

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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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A detailed elastic analysis of the flat punch (tack) test for pressure-sensitive adhesives

Lin¹,

Chen²,

Conway³

2000

J. Polym. Sci. B Polym. Phys.

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Detailed finite element calculations are carried out in order to study the mechanical response of a compliant layer sandwiched between a rigid cylindrical flat punch and a rigid substrate. Two cases of practical interest are considered: one in which the layer is perfectly bonded to the punch and the substrate and one in which the interface between the punch and the layer is frictionless. The substrate is assumed to be perfectly bonded to the adhesive layer in both cases. Analytic expressions are obtained for the stresses away from the edges, and the effect of lateral constraint is examined. The compliances of the loading systems for both cases are obtained numerically, and accurate analytic expressions are determined based on these numeric results. The nature of the stress fields near the contact edge are explored, and their connections with the energy release rate are determined. The relevance of these calculations to two recent adhesion tests is discussed. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2769–2784, 2000

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Micromechanics of flat-probe adhesion tests of soft viscoelastic polymer films

Cited by 126 publications

References 34 publications

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Deformation and failure modes of adhesively bonded elastic layers

A detailed elastic analysis of the flat punch (tack) test for pressure-sensitive adhesives

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