Subcritical Failure of Soft Acrylic Adhesives under Tensile Stress

Lindner, Anke; Maevis, T.; Brummer, R.; Lühmann, B.; Creton, Costantino

doi:10.1021/la049388s

Cited by 41 publications

(40 citation statements)

References 34 publications

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“…When the spring constant is comparable to the elasticity, the limit of K   will give an upper bound for the shift in contact position, although for many experiments such as probe-tack tests 42 , extensional rheology measurements, 43 and more generally measurements with stiff cantilevers and load cells, the K   situation are often encountered.…”

Section: K mentioning

confidence: 99%

Elastic deformation of soft coatings due to lubrication forces

2017

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Elastic deformation of rigid materials with soft coatings (stratified materials) due to lubrication forces can also alter the interpretation of dynamic surface forces measurements and prevent contact formation between approaching surfaces. Understanding the role of elastic deformation on the process of fluid drainage is necessary, and the case where one (or both) of the interacting materials consists of a rigid substrate with a soft coating is still limited. We combine lubrication theory and solid linear elasticity to describe the dynamic of fluid drainage past a compliant stratified boundary. The analysis presented covers the full range of coating thicknesses, from an elastic foundation to a half-space for an incomressible coating. We decouple the individual contributions of the coating thickness and material properties on the elastic deformation, hydrodynamic forces, and fluid film thickness. We obtain a simple expression for the shift in contact position during force measurements that is valid for many experimental conditions. We compare directly the effect of stratification on the out-of-contact deformation to the well-known effect of stratification on indentation. We show that corrections developed for stratification in contact mechanics are not applicable to elastohydrodynamic deformation. Finally, we provide generalized contour maps that can be employed directly to estimate the elastic deformation present in most dynamic surface force measurements. IntroductionRigid materials with soft coatings are ubiquitous in tribology, 1 microfluidic devices, 2 biomaterials, 3 or colloidal and particulate systems. 4 Under many practical settings they are employed in fluid environments where they are in close proximity to another surface. Under these conditions viscous forces due to the relative movement of the two surfaces can exert fluid pressures and cause elastic deformation (see Figure 1). More specifically, lubrication forces can lead to elastic deformation, also known as elastohydrodynamic deformation or EHD, which can prevent contact formation as fluid drains from a gap separating compliant materials. [5][6][7] If unaccounted for, EHD can lead to the misinterpretation of dynamic surface forces measurements. The surface forces apparatus (SFA) 6 or the atomic force microscope (AFM) 8 are commonly employed under dynamic conditions and can be used with soft materials. In particular, an exact description of lubrication forces is necessary to rely on dynamic surface forces measurements for the characterization of, for example, conservative surface forces, 9 fluid structure, 10 or surface slip 11 on compliant materials. In addition, recent reports show that ignoring the effect of elastic deformation can lead to a misinterpretation of the force data, contact position, and slip at the solid-liquid surfaces. 8,12 Most previous efforts to describe unsteady normal fluid drainage past an elastic boundary studied the case where the soft materials could be considered a half-space. For instance, Davis et al. studied normal e...

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Section: K mentioning

confidence: 99%

Elastic deformation of soft coatings due to lubrication forces

2017

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“…The PZ model is derived based on a force balance at the peel zone and takes into account three forces: the peel force F acting in the peel direction, the adhesion force F ⊥ acting normal to the surface, and the friction/shear force F || acting parallel to the surface. The peel zone is defined as the bifurcation between the tape backing and the surface in which cavitation and fibrillation occur ( Figure 1C) [Zosel, 1989;Zosel, 1998;Créton and Leibler, 1996;Lindner et al, 2004;Shull et al, 2004;Portigliatti et al, 2000]. We assume that the curvature of the tape backing is circular and that the length of the peel zone on the surface is equal to the arc length of the tape backing up to the point of the last fibril or filament.…”

Section: Theorymentioning

confidence: 99%

“…Depending of the tackiness of the adhesive [Zosel, 1989;Zosel, 1998;Créton and Leibler, 1996;Lindner et al, 2004;Shull et al, 2004;Portigliatti et al, 2000], φ o can range from 90 o (large tackiness) to almost 0 o (small tackiness). For peel angles greater than φ o , the shape and dimension of the peel zone remains constant and thus the normal component of the peel force also remains constant.…”

Section: Constant Peel Zone Detachment Modementioning

confidence: 99%

Peel-Zone Model of Tape Peeling Based on the Gecko Adhesive System

Pesika

Tian

Zhao

et al. 2007

The Journal of Adhesion

165

169

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A tape peeling model based on the geometry of the peel zone (PZ) is derived to predict the peeling behavior of adhesive tapes at peel angles less than or equal to 90o . The PZ model adds an angle-dependent multiplier to the 'Kendall equation' that takes into account the geometrical changes within the peel zone. The model is compared to experimental measurements of the peel force at different angles for a model tape and two commercial tapes, each with different bending moduli, stretch moduli and adhesive strengths. Good agreement is found for a wide range of peel angles. The PZ model is also applied to the gecko adhesive system and predicts a spatula peel angle of 18.4 o to achieve the adhesion forces reported for single setae. The PZ model captures the fact that adhesive forces can be significantly enhanced by peeling at an angle, thereby exploiting high friction forces between the detaching material and the substrate.

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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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Subcritical Failure of Soft Acrylic Adhesives under Tensile Stress

Cited by 41 publications

References 34 publications

Elastic deformation of soft coatings due to lubrication forces

Elastic deformation of soft coatings due to lubrication forces

Peel-Zone Model of Tape Peeling Based on the Gecko Adhesive System

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

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