Mechanical modelling of blisters on coated laminates II — experimental analysis

Castaing, Patrice; Lemoine, L.; Gourdenne, Albert

doi:10.1016/0263-8223(95)80016-6

Cited by 12 publications

(6 citation statements)

References 2 publications

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“…When the fluence exceeds a threshold value (ablation threshindustry, both from a chemical point of view 11 and from a mechanical point of view. 12,13 One of the old), material ejection from the surface occurs via photothermal and/or photochemical effects (ablaways considered to explain the blistering produced by osmosis mechanisms [14][15][16] involves the tion regime). [25][26][27] Surface ablation under UV laser radiation has found interesting applications such formation of small soluble molecules that contribute to the development of an osmotic pressure and as surface cleaning, cornea surgery, micromachining (drilling and patterning), or thin film deposistructural differences in the thermosetting UP network with different hydrophilicities, in which tion.…”

Section: Introductionmentioning

confidence: 99%

Study of unsaturated polyester and vinylester morphologies using excimer laser surface treatment

Mortaigne

Feltz

Laurens

1997

J. Appl. Polym. Sci.

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ABSTRACT:A technique based on the use of an ArF excimer laser (193 nm) to analyze the morphology of the unsaturated polyester and vinylester networks has been developed. This method is based on the use of the differences between the thresholds at which ablation of the various constituent phases of the materials occurs.After having determined the ablation threshold of a polystyrene, various surface treatments using excimer lasers fluence around this threshold were applied to unsaturated polyesters and vinylester. In the latter case, a two-phase structure consisting of microgels in a polystyrene phase was shown by scanning electron microscopy observations, allowing us to conclude that the mechanisms by which vinylester and unsaturated polyester networks are formed are similar. We also observed that the two-phase structure of the vinylester matrixes, unlike that of the unsaturated polyesters, is organized rather than random-structured, which could represent a major parameter contributing to the very good hydrolysis stability of these materials. In the event of degradation by osmotic mechanisms, the organized structure network would enable limiting of the development of the osmotic pressures by distributing the forces within the material, thus avoiding crazing.

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Section: Introductionmentioning

confidence: 99%

Study of unsaturated polyester and vinylester morphologies using excimer laser surface treatment

Mortaigne

Feltz

Laurens

1997

J. Appl. Polym. Sci.

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“…2(b). Such blisters have been observed experimentally in gel-coated laminates when they are submerged in water [16]. The analysis here would be applicable to the evolution of this blister if it were subsequently dried out.…”

Section: Problem Ii: the Drying Of An Isolated Blister In A Membranementioning

confidence: 61%

“…(14) may be eliminated in favor of p x so that only the mean tension γ 0 remains unknown. The evolution of the membrane's shape is given by the kinematic relation h t =ṽ −ũh x , and from (16) and (15) this implies that, at leading order,…”

Section: Problem Descriptionmentioning

confidence: 99%

“…These include the onset of wrinkling in an impermeable surfactant monolayer as it is compressed longitudinally [14] and the delamination of a membrane from a substrate caused either by longitudinal compression of the substrate [15] or through osmotic cavitation when a coated substrate is submerged in water [16]. Our model would be applicable to the situation where the liquid beneath the delaminated membrane is subsequently removed through drying.…”

Section: Introductionmentioning

confidence: 99%

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Fluid flow beneath a semipermeable membrane during drying processes

2012

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The dynamic interactions between a semipermeable membrane and a long, thin layer of liquid beneath it are investigated in the context of drying processes. The membrane separates two aqueous solutions of sugar, and the transport of water across the membrane is driven by concentration and pressure gradients across it. A model is formulated using a long-wave approximation that includes the effects of volume loss due to water transport across the membrane, the incompressibility and bending stiffness of the membrane, and the dynamical effects that arise owing to the viscous stresses generated by the fluid flow. This model is first applied to study the desiccation of a sessile vesicle that is clamped to a rigid substrate and then also to study the behavior of blisters on laminated substrates. For each problem, equilibrium membrane shapes are obtained and their bifurcation structures are described as the sugar concentration above the membrane is varied. It is demonstrated that a wrinkled membrane coarsens to lessen the frequency of wrinkles and that if the membrane is clamped symmetrically so that it meets the substrate at a nonzero angle, then the membrane favors an asymmetric shape as water is drawn out through it.

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“…In the blister test, a concentrated load or pressure is applied on the coating surface to deflect the axisymmetric detached coating [1][2][3][4][5][6]. The constitutive relation between the external force and deflection of the detached coating can be obtained by the technique and used for studying the system's mechanical properties, e.g.…”

Section: Introductionmentioning

confidence: 99%