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Littérature scientifique sur le sujet « Interfacial deformation »

Auteur : Grafiati

Publié le 29 mars 2025

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Articles de revues sur le sujet "Interfacial deformation"

Stone, H. A., et L. G. Leal. « The effects of surfactants on drop deformation and breakup ». Journal of Fluid Mechanics 220 (novembre 1990) : 161–86. http://dx.doi.org/10.1017/s0022112090003226.

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The effects of surface-active agents on drop deformation and breakup in extensional flows at low Reynolds numbers are described. In this free-boundary problem, determination of the interfacial velocity requires knowledge of the distribution of surfactant, which, in turn, requires knowledge of the interfacial velocity field. We account for this explicit coupling of the unknown drop shape and the evolving surfactant distribution. An analytical result valid for nearly spherical distortions is presented first. Finite drop deformation is studied numerically using the boundary-integral method in conjunction with the time-dependent convective–diffusion equation for surfactant transport. This procedure accurately follows interfacial tension variations, produced by non-uniform surfactant distribution, on the evolving interface. The numerical method allows for an arbitrary equation of state relating interfacial tension to the local concentration of surfactant, although calculations are presented only for the common linear equation of state. Also, only the case of insoluble surfactant is studied.The analytical and numerical results indicate that at low capillary numbers the presence of surfactant causes larger deformation than would occur for a drop with a constant interfacial tension equal to the initial equilibrium value. The increased deformation occurs owing to surfactant being swept to the end of the drop where it acts to locally lower the interfacial tension, which therefore requires increased deformation to satisfy the normal stress balance. However, at larger capillary numbers and finite deformations, this convective effect competes with ‘dilution’ of the surfactant due to interfacial area increases. These two different effects of surface-active material are illustrated and discussed and their influence on the critical capillary number for breakup is presented.

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Mangipudi, V. S., et M. Tirrell. « Contact-Mechanics-Based Studies of Adhesion between Polymers ». Rubber Chemistry and Technology 71, n^o 3 (1 juillet 1998) : 407–48. http://dx.doi.org/10.5254/1.3538490.

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Abstract Contact mechanics deals with the deformation of solid bodies in contact. In recent years, significant advances have been made both in the theoretical and experimental areas of contact mechanics, especially in the area of soft solids, in relating the contact deformation to interfacial adhesion. On the theoretical front, new theories of contact mechanics have been developed to relate the interfacial force induced deformation to the thermodynamic work of adhesion both for elastic and viscoelastic solids. On the experimental front, several new techniques have been developed to measure the interfacial forces and the interfacial-force-induced deformations. These techniques have been used, with the aid of the theories of contact mechanics, to measure directly the surface and interfacial energies of a variety of polymers and other model surfaces. These experimental and theoretical developments have also been exploited to measure quantitatively the effect of interfacial chain diffusion on the adhesion of polymer interfaces. We summarize the recent developments in the theories of contact mechanics, and their applications in the design and interpretation of experimental measurement of molecular level adhesion between elastomers, glassy and viscoelastic polymers. We also review the experimental and theoretical developments related to the role of chain diffusion on interfacial adhesion. Finally, we identify some potential new applications of contact-mechanics-based techniques in such emerging area of adhesion science as molecular level studies of adhesion of viscoelastic materials and biomaterials.

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Pelipenko, Jan, Julijana Kristl, Romana Rošic, Saša Baumgartner et Petra Kocbek. « Interfacial rheology : An overview of measuring techniques and its role in dispersions and electrospinning ». Acta Pharmaceutica 62, n^o 2 (1 juin 2012) : 123–40. http://dx.doi.org/10.2478/v10007-012-0018-x.

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Interfacial rheology: An overview of measuring techniques and its role in dispersions and electrospinning Interfacial rheological properties have yet to be thoroughly explored. Only recently, methods have been introduced that provide sufficient sensitivity to reliably determine viscoelastic interfacial properties. In general, interfacial rheology describes the relationship between the deformation of an interface and the stresses exerted on it. Due to the variety in deformations of the interfacial layer (shear and expansions or compressions), the field of interfacial rheology is divided into the subcategories of shear and dilatational rheology. While shear rheology is primarily linked to the long-term stability of dispersions, dilatational rheology provides information regarding short-term stability. Interfacial rheological characteristics become relevant in systems with large interfacial areas, such as emulsions and foams, and in processes that lead to a large increase in the interfacial area, such as electrospinning of nanofibers.

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TAKADA, NAOKI, AKIO TOMIYAMA et SHIGEO HOSOKAWA. « LATTICE BOLTZMANN SIMULATION OF INTERFACIAL DEFORMATION ». International Journal of Modern Physics B 17, n^o 01n02 (20 janvier 2003) : 179–82. http://dx.doi.org/10.1142/s0217979203017308.

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This study describes the numerical simulations of two-phase interfacial deformations using the binary fluid (BF) model in the lattice Boltzmann method (LBM), where a macroscopic fluid involves mesoscopic particles repeating collisions and propagations and an interface is reproduced in a self-organizing way by repulsive interaction between different kinds of particles. Schemes for the BF model are proposed to simulate motions of immiscible two phases with different mass densities. For higher Reynolds number, the finite difference-based lattice Boltzmann scheme is applied to the kinetic equations of particles, which include convection terms to reduce the diffusivity of each phase volume. In addition, two parameters are introduced into the BF model to adjust surface tension and interfacial thickness independently. The numerical results of three-dimensional bubble motion under gravity and two-dimensional droplet deformation under shear stress indicate that the lattice-Boltzmann BF model with the proposed schemes would be applicable to simulating interfacial dynamics of immiscible two-phase fluids.

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Takahashi, Yasuo, et Michinobu Inoue. « Numerical Study of Wire Bonding—Analysis of Interfacial Deformation Between Wire and Pad ». Journal of Electronic Packaging 124, n^o 1 (13 mars 2001) : 27–36. http://dx.doi.org/10.1115/1.1413765.

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The purpose of the present study is to understand the interfacial deformation between pad and wire and the effect of the pad thickness, the pad hardness, and the tool shape on the interfacial deformation. The relationship between the bondability and the interfacial deformation (surface exposure to produce the clean surface) is summarized, because the bondability is largely affected by the interfacial deformation. A simple model of wire bonding is proposed for the numerical analysis. The model is based on the finite element method for rate sensitive materials and applicable to very large deformation processes. The numerical simulation made it possible to visualize the interfacial contacting process which occurs for several milli-seconds. It was suggested that the periphery bond is produced easily as the pad thickness decreases and the pad hardness increases. On the other hand, it was found that the thick pad and the groove tool can help the center bond formation. These results is explained by the distributions of the interfacial extension and the equivalent stress on the bonding interface. Also, the damage to the substrate (Si chip) is discussed, based on the numerical results.

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Samanta, Amit, et Weinan E. « Interfacial diffusion aided deformation during nanoindentation ». AIP Advances 6, n^o 7 (juillet 2016) : 075002. http://dx.doi.org/10.1063/1.4958299.

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Haruki, Sakamaki, Kumagai Ichiro, Oishi Yoshihiko, Tasaka Yuji et Murai Yuichi. « 1051 FLOWS AND INTERFACIAL DEFORMATION AROUND A HYDROFOIL BENEATH A FREE SURFACE ». Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013) : _1051–1_—_1051–6_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1051-1_.

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WETZEL, ERIC D., et CHARLES L. TUCKER. « Droplet deformation in dispersions with unequal viscosities and zero interfacial tension ». Journal of Fluid Mechanics 426 (10 janvier 2001) : 199–228. http://dx.doi.org/10.1017/s0022112000002275.

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An analytical model is presented for the deformation of an ellipsoidal Newtonian droplet, suspended in another Newtonian fluid with different viscosity and zero interfacial tension. The theory is exact for any linear velocity field, and is not limited to small deformations. It encompasses some well-known special cases, such as Jeffery's equation for solid axisymmetric particles and Taylor's small-deformation theory for droplets. Example calculations exhibit droplet stretching, reorientation, and tumbling, and provide a reasonable match to available experimental data on transient and steady droplet shapes. The corresponding rheological theory for dilute dispersions is also derived, in a form that explicitly includes the effects of microstructure on dispersion rheology.

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Lee, Doojin, et Amy Q. Shen. « Interfacial Tension Measurements in Microfluidic Quasi-Static Extensional Flows ». Micromachines 12, n^o 3 (6 mars 2021) : 272. http://dx.doi.org/10.3390/mi12030272.

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Droplet microfluidics provides a versatile tool for measuring interfacial tensions between two immiscible fluids owing to its abilities of fast response, enhanced throughput, portability and easy manipulations of fluid compositions, comparing to conventional techniques. Purely homogeneous extension in the microfluidic device is desirable to measure the interfacial tension because the flow field enables symmetric droplet deformation along the outflow direction. To do so, we designed a microfluidic device consisting of a droplet production region to first generate emulsion droplets at a flow-focusing area. The droplets are then trapped at a stagnation point in the cross junction area, subsequently being stretched along the outflow direction under the extensional flow. These droplets in the device are either confined or unconfined in the channel walls depending on the channel height, which yields different droplet deformations. To calculate the interfacial tension for confined and unconfined droplet cases, quasi-static 2D Darcy approximation model and quasi-static 3D small deformation model are used. For the confined droplet case under the extensional flow, an effective viscosity of the two immiscible fluids, accounting for the viscosity ratio of continuous and dispersed phases, captures the droplet deformation well. However, the 2D model is limited to the case where the droplet is confined in the channel walls and deforms two-dimensionally. For the unconfined droplet case, the 3D model provides more robust estimates than the 2D model. We demonstrate that both 2D and 3D models provide good interfacial tension measurements under quasi-static extensional flows in comparison with the conventional pendant drop method.

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Komvopoulos, K., et W. Yan. « Three-Dimensional Elastic-Plastic Fractal Analysis of Surface Adhesion in Microelectromechanical Systems ». Journal of Tribology 120, n^o 4 (1 octobre 1998) : 808–13. http://dx.doi.org/10.1115/1.2833783.

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High adhesion is often encountered at contact interfaces of miniaturized devices, known as microelectromechanical systems, due to the development of capillary, electrostatic, and van der Waals attractive forces. In addition, deformation of contacting asperities on opposing surfaces produces a repulsive interfacial force. Permanent surface adhesion (referred to as stiction) occurs when the total interfacial force is attractive and exceeds the micromachine restoring force. In the present study, a three-dimensional fractal topography description is incorporated into an elastic-plastic contact mechanics analysis of asperity deformation. Simulation results revealing the contribution of capillary, electrostatic, van der Waals, and asperity deformation forces to the total interfacial force are presented for silicon/silicon and aluminum/aluminum material systems and different mean surface separation distances. Results demonstrate a pronounced effect of surface roughness on the micromachine critical stiffness required to overcome interfacial adhesion.

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Thèses sur le sujet "Interfacial deformation"

Hargreaves, Alexander Leighton. « Optical deformation of microdroplets at ultralow interfacial tension ». Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11617/.

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What is the shape of a droplet? Its interfacial tension dictates that it is very close to a perfect sphere. Herein, the interfacial tension is reduced to ultralow values (0.1 - 100 uN/m) by careful formulation of surfactant additives, such as for mixtures that form microemulsions. The droplet need not be spherical but can accommodate external forces of a similar magnitude. The control and precision of forces afforded simply by light - in the form of highly focused Nd:YAG laser beams - are exploited in this work to deform hydrocarbon oil-in-water emulsion droplets of 1-10 um diameter. To this end, a novel, integrated platform for microfluidic generation, optical deformation and 3D fluorescent imaging of droplets is presented. Previous attempts to characterise optically-controlled microdroplet shapes have been limited to 2D projections. Here, that ambiguity is resolved using 3D confocal laser scanning- and structured illumination microscopy. 2D and 3D arrays of up to four Gaussian point traps are generated by holograms and acousto-optics. A variety of regular, prolate, oblate and asymmetric shapes are produced and correlated with parameters such as optocapillary number, trap separation and capillary length. Exotic shapes exhibiting zero or negative mean and Gaussian curvatures are presented alongside their brightfield counterparts. The complex phase behaviour of emulsion droplets and their parent phases is observed to couple strongly to thermal absorption of the beams. The rich interfacial chemistry, its relation to the forces determining droplet shape and the surprising ability to create nanofluidic networks between droplets are investigated.

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Tze, William tai-Yin. « Effects of Fiberimatiux Interactions on the Interfacial Deformation Micromechanics of Cellulose-Fiberipolymer Composites ». Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/TzeWT2003.pdf.

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Tsai, Scott. « Magnetic Spheres in Viscous Flows and at Interfaces : Sorting, Coating, and Interfacial Deformation ». Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10151.

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Magnetic microparticles are often used in laboratory settings for the separation of biological material. These microparticles can also be useful in microfluidic settings because of their small size and the possibility of manipulating them with magnetic forces. Typical microfluidic flows have low Reynolds and Bond numbers, such that viscosity and interfacial tension dominate the dynamics of the system. However, body forces can become important when magnetic forces act on the magnetic microparticles. This dissertation describes several examples where the magnitude of the body forces on magnetic microparticles are comparable to viscous and capillary forces. Specifically, four cases are described where magnetic forces either deflect individual particles across fluid streamlines and fluid-fluid interfaces, or assemble clusters of particles through a magnetic-capillary interaction. The first example (Chapter 2) documents a systematic study of a particle’s deflection in a microchannel as a function of the particle size and susceptibility, the external magnet’s strength, and the fluid’s speed and viscosity. We describe experimental results of particles flowing in a single phase fluid. The results lead to the development of a theoretical model that captures the relationship between the individual variables and the particle’s deflection. Chapter 3 describes a set of experiments where a second immiscible fluid phase is introduced to the microfluidic channel and the two fluids form a co-flow. Particles from the magnetic suspension are forced through the fluid-fluid interface and coated with a thin layer of the initial phase. The thickness of the coating layer is controlled by the magnitude of the flow speed. The number of particles captured in a single cluster is adjusted by varying the strength of the magnetic field or the liquid-liquid interfacial tension. Chapter 4 combines the microfluidic co-flow experiments with a mathematical model of the magnetic force on a single particle. By deflecting the particles and observing their behavior at the fluid-fluid interface − the particles either pass through or are trapped − it is possible to obtain an estimate of the interfacial tension between the two fluids. The proposed measurement technique is useful for ultralow interfacial tensions, and an experiment is described where a range of interfacial tensions, \(O(10^{−6} − 10^{−5}) N/m\), are measured for an oil-water mixture with varying surfactant concentrations. The final example (Chapter 5) describes the bulk deformation of a liquid-air interface by an aggregate of magnetic particles. As a permanent magnet is brought closer to the interface, the deformation grows. Above a threshold of magnetic force, the interface destabilizes and forms a jet. Mathematical models are developed that predict the shape of the deformation and the transition to a jet.
Engineering and Applied Sciences

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Rusli, Rafeadah. « Interfacial micromechanics of natural cellulose whisker polymer nanocomposites using Raman spectroscopy ». Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/interfacial-micromechanics-of-natural-cellulose-whisker-polymer-nanocomposites-using-raman-spectroscopy(2eab8693-78b1-4241-bcfb-f7d2ae39fbf6).html.

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Raman spectroscopy has been used to monitor the deformation of natural cellulose whisker polymer nanocomposites. Cotton and tunicate whiskers were used as reinforcements in polymer matrices. Raman spectra from the nanocomposites highlight an intense band located at the 1095 cm-1 position. This band is reported to shift towards a lower wavenumber under the application of tensile deformation. On the other hand, the compressive deformation of the composite gives rise to an increase in the position of this Raman band. The shifts correspond to the direct deformation of the molecular backbone of cellulose, which is dominated by a C-O stretching mode. The Raman band located at 1095 cm-1 is shown to shift non-linearly before it reaches a plateau due to the breakdown of the whisker-matrix interface. The initial shift rate is associated with the stiffness of the cellulose whiskers. The stiffnesses of single whiskers of cotton and tunicate are found to be 58 and 155 GPa respectively, assuming two dimensional (2D) in-plane distribution of whiskers. Cyclic deformation tests of the composites provide an insight into understanding the behaviour of the whisker-polymer matrix interface under tension and compression. It is found that residual compressive stress occurs during each cycle of the deformation. The level of disruption at the whisker-matrix interface is determined by estimating the energy dissipation, which is proportional to the hysteresis area. Local orientation is also observed in the nanocomposites produced by solution casting and subsequent melt pressing. Dark regions of the composites viewed under a polarised optical microscopy are found to represent areas in which the cellulose whiskers form a randomly oriented whisker network. A shift rate for the Raman band initially located at 1095 cm-1 obtained in the dark regions of 12.2 vol% tunicate whisker poly(vinyl acetate) nanocomposites is found to be -0.5±0.07 cm-1%-1, which is lower than -1.2±0.04 cm-1%-1 from the bright regions. Exposure to water and temperature during the deformation of the nanocomposites results in significant changes in stress transfer between the whiskers and the matrix. It is shown that the interface can be 'switched-off' for the poly(vinyl acetate)/whisker system in the presence of water and also at temperature above the glass transition.

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Zhou, Diwen. « Interfacial dynamics in complex fluids : studies of drop and free-surface deformation in polymer solutions ». Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/17457.

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Interfacial flows in complex fluids are an important subject, scientifically rich and technologically important. The main scientific attraction comes from the fact that the microstructure of the bulk fluids may evolve during interfacial flow, and thereby generating non-Newtonian stresses that act on the interface. Thus, interfacial motion and conformation of the microstructure are coupled. Such flow situations arise in many industrial applications, including processing of polymer blends, foaming, and emulsification. In this thesis, I describe three projects aimed at exploring interfacial dynamics of viscoelastic polymeric liquids. The first project consists of finite-element simulations of drop deformation in converging flows in an axisymmetric conical geometry. The moving interface is captured using a diffuse-interface model and accurate interfacial resolution is ensured by adaptive refinement of the grid. The drop experiences a predominantly elongational flow. The amount of deformation sustained by the drop depends, besides the geometry and kinematics of the flow, on the rheology of both the drop and the matrix fluids. The second and third projects concern the same process of selective withdrawal, in which stratified layers of immiscible fluids are withdrawn from a tube placed a certain distance from the interface. We have chosen to work with an air-liquid system, with the suction tube embedded in the Newtonian or viscoelastic liquid. The second project is an experimental study, where we used video recording and imaging processing to analyze how the interfacial deformation is influenced by the non-Newtonian rheology of the liquid. We discover three regimes, subcritical, critical and supercritical. The third project consists of sharp-interface, moving-grid finite-element simulations of selective withdrawal for Newtonian and viscoelastic Giesekus liquids. The experiments and computations are in reasonable agreement. The work of this thesis has led to two main outcomes. The first is a detailed understanding of how viscoelastic stress can lead to unusual and sometimes counter-intuitive effects on interfacial deformation. The second is a potentially important new method for measuring elongational viscosity of low-viscosity liquids. This is worth further investigation considering the poor performance of existing methods.

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Habibzadeh, Pouya. « Small Scale Plasticity With Confinement and Interfacial Effects ». Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/226220.

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The mechanical properties of crystalline metals are strongly affected when the sample size is limited to the micron or sub-micron scale. At these scales, the mechanical properties are enhanced far beyond classical predictions. Besides, the surface to volume ratio significantly increases. Therefore surfaces and interfaces play a big role in the mechanical properties of these micro-samples. The effect of different interfaces on the mechanical properties of micro-samples is not yet well understood. The aim of this project is to characterize, understand, and predict the effect of confinement on deformation mechanisms at micro-scale. In this study, micro-pillars were fabricated by Focused Ion Beam (FIB). Micro-pillars were homogeneously coated with thin films by magnetron sputtering and cathodic arc deposition. The mechanical properties of carbon-coated-, chromium coated-, naked-, annealed- and non-annealed micro-pillars were measured. Afterwards, the results of micro-compression tests and Automated Crystal Orientation Mapping on Transmission electron microscopy (ACOM TEM) were compared and led to some surprising new findings.Dislocations are blocked by amorphous- and even crystalline coating in the deformed samples. Parallel slip systems were detected in the chromium layer and the copper micro-pillar. Even though the chromium layer has parallel slip systems, dislocation pile-up at the interface was found after deformation. The most significant finding in this study concerns the back stress of the dislocation pile-up, which affects the dislocation sources and causes an increase of the flow stress to generate new dislocations from these sources. Thermal annealing increases the strength and flow stress of FIB fabricated micro samples. The annealing treatment restores the lattice that was damaged by the FIB fabrication process. A higher stress is required to initiate the dislocation nucleation in a pristine lattice. Techniques of fabrication and investigation were developed to study the role of confinement and interfaces on the mechanical properties of materials at micro scale. Mechanisms of deformation were unraveled and a better understanding of the key parameters was reached.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished

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Peng, Xuan. « Co-deformation and bonding of multi-component billets with application to Nb-Sn based superconductor processing ». Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1127096847.

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Thesis (Ph. D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xix, 182 p.; also includes graphics (some col.). Includes bibliographical references (p. 177-182). Available online via OhioLINK's ETD Center

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Strömbro, Jessica. « Micro-mechanical mechanisms for deformation in polymer-material structures ». Doctoral thesis, KTH, Hållfasthetslära (Inst.), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4626.

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In this thesis, the focus has been on micro-mechanical mechanisms in polymer-based materials and structures. The first part of the thesis treats length-scale effects on polymer materials. Experiments have showed that the smaller the specimen, the stronger is the material. The length-scale effect was examined experimentally in two different polymers materials, polystyrene and epoxy. First micro-indentations to various depths were made on polystyrene. The experiments showed that length-scale effects in inelastic deformations exist in polystyrene. It was also possible to show a connection between the experimental findings and the molecular length. The second experimental study was performed on glass-sphere filled epoxy, where the damage development for tensile loading was investigated. It could be showed that the debond stresses increased with decreasing sphere diameter. The debonding grew along the interface and eventually these cracks kinked out into the matrix. It was found that the length to diameter ratio of the matrix cracks increased with increasing diameter. The experimental findings may be explained by a length-scale effect in the yield process which depends on the strain gradients. The second part of the thesis treats mechano-sorptive creep in paper, i.e. the acceleration of creep by moisture content changes. Paper can be seen as a polymer based composite that consists of a network of wood fibres, which in its turn are natural polymer composites. A simplified network model for mechano-sorptive creep has been developed. It is assumed that the anisotropic hygroexpansion of the fibres leads to large stresses at the fibre-fibre bonds when the moisture content changes. The resulting stress state will accelerate creep if the fibre material obeys a constitutive law that is non-linear in stress. Fibre kinks are included in order to capture experimental observations of larger mechano-sorptive creep effects in compression than in tension. Furthermore, moisture dependent material parameters and anisotropy are taken into account. Theoretical predictions based on the developed model are compared to experimental results for anisotropic paper both under tensile and compressive loading at varying moisture content. The important features in the experiments are captured by the model. Different kinds of drying conditions have also been examined.
QC 20100910

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Abi, Chebel Nicolas. « Dynamique et rhéologie interfaciales à haute fréquence d'une goutte oscillante ». Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT043G/document.

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Ce travail présente une étude de la dynamique interfaciale de gouttes oscillantes dans une plage étendue de fréquences, en particulier dans le domaine des hautes fréquences. Nous avons développé une méthode de caractérisation de la dynamique des oscillations de gouttes, en présence d’un forçage externe imposé, sous la forme de variations de volume périodiques de faible amplitude sur une goutte attachée à l’extrémité d’un capillaire. Cette méthode permet d’identifier les modes d’oscillation des gouttes et d’en mesurer les fréquences et les taux d’amortissement. Cette méthode a été appliquée à différents systèmes liquide-liquide, en l’absence ou en présence de surfactants. Dans ce dernier cas, elle permet d’évaluer l’effet du comportement viscoélastique des interfaces sur la dynamique des oscillations. Ainsi 3 types d’interfaces ont été identifiés. Pour les interfaces de premier type (heptane/eau sans ajout de surfactant), chaque mode propre est modélisé par un oscillateur linéaire peu amorti. Les fréquences propres et les taux d’amortissement sont bien prédits par la théorie linéaire. Les interfaces de types 2 et 3 sont obtenues en ajoutant du pétrole brut à la phase dispersée. Les surfactants naturellement présents dans le pétrole (asphaltènes, résines) s’adsorbent à l’interface et lui confèrent des propriétés viscoélastiques. Pour les interfaces jeunes (type 2, moins de 20 minutes de vieillissement), les fréquences propres mesurées restent bien prédites par la théorie, qui considère des interfaces non contaminées, tandis que les taux d’amortissement sont de loin supérieurs aux valeurs théoriques. D’autre part, les interfaces vieillies (type 3) présentent des modes propres différents avec des fréquences de résonance supérieures à celles des interfaces jeunes. Dans ce cas, la dynamique de l’interface à haute fréquence est régie par l’élasticité du réseau formé par les espèces amphiphiles du pétrole brut. Les oscillations libres d’une goutte en ascension dans une phase externe stagnante, pour un système liquide-liquide sans ajout de surfactants, ont été étudiées. Les valeurs mesurées de la fréquence d’oscillation des 4 premiers modes sont en adéquation avec la théorie linéaire. Cependant les valeurs mesurées du taux d’amortissement sont très élevées par rapport aux valeurs théoriques, pour une interface non contaminée. En effet, des espèces résiduelles adsorbées à l’interface provoquent l’apparition d’un gradient de tension interfaciale par effet Marangoni et par suite une production de vorticité plus intense dans les couches-limites, ce qui conduit à l’augmentation de l’amortissement des oscillations
We present an experimental study of oscillating drop interfacial dynamics at a wide frequency range, especially at high frequency. A characterization method of drops oscillation dynamics has been developed. The oscillations are generated by imposing low amplitude periodic variation of volume to a drop which is attached to a capillary tip. The present method is based on the identification of the drop eigenmodes and the determination of their frequencies and damping rates. It has been applied to characterize several liquid-liquid systems. Three types of interface have been identified. For interfaces of type 1 (heptane/water without added surfactant), each eigenmode is modelled by a weakly damped linear oscillator. Eigenfrequencies and damping rates are well predicted by the linear theory. Interfaces of Types 2 and 3 are obtained by adding crude oil to the disperse phase. Oil native surfactants (asphaltenes, resins) adsorb on the drop interface and provide the latter with viscoelastic behaviour. For young interfaces (type 2 with aging time below 20 minutes), eigenfrequencies remain well predicted by the theory, which deals with non contaminated interfaces, whereas the measured damping rates are significantly higher than the theoretical values. On the other hand, aged interfaces (type 3) exhibit different eigenmodes, of which eigenfrequencies are much higher than the resonance frequencies measured for the young interfaces. At high frequency, the dynamics of aged interfaces are governed by the elasticity of the network constituted by the crude oil amphiphilic species, while the dynamics of young interfaces are governed by interfacial tension. Freely decaying oscillations of a rising drop in a liquid at rest without added surfactant were also considered. Measured frequencies for the first four eigenmodes are in good agreement with the linear theory. However, measured damping rates are much higher than the theoretical rates for non contaminated interfaces. In fact, residual adsorbed species at the heptane/water interface induce Marangoni effects and thus gradients of interfacial tension. Therefore, vorticity production within the boundary layers is enhanced, which explains the observed increase of the oscillation damping rates

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Zhang, Hao. « Écoulement des fluides et déformation interfaciale : nano-rhéologie et force de portance ». Electronic Thesis or Diss., Bordeaux, 2025. http://www.theses.fr/2025BORD0027.

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Cette thèse examine l'interaction entre l'écoulement des fluides et la déformation interfaciale à l'aide de la Microscopie à Force Atomique (AFM). Tout d'abord, l'AFM a été utilisé pour explorer les fluctuations capillaires thermiques résonantes (RTCF) des surfaces de bulles et de gouttes, permettant ainsi de mesurer l'élasticité de surface et la viscosité en volume «bulk » aux interfaces air/eau chargées en tensioactifs et dans les solutions polymères. Ces mesures ont élargi la plage de fréquence pour les investigations rhéologiques, surmontant les limitations des rhéomètres classiques. Ensuite, nous avons introduit une méthode sans contact pour évaluer les propriétés mécaniques des cellules vivantes, basée sur l'interaction élastohydrodynamique (EHD) entre les vibrations thermiques du levier AFM et les déformations des cellules. Cette méthode a permis de déterminer avec précision le module élastique d'une cellule vivante à différentes fréquences. Enfin, nous avons réalisé la première mesure directe et quantitative de la force de portance agissant sur une sphère se déplaçant le long d'une interface liquide-liquide. Cette force, résultant du couplage entre l'écoulement visqueux et la déformation capillaire de l'interface, a été mesurée en fonction de la distance entre la sphère et l'interface à l'aide de l'AFM. Nous avons étudié diverses interfaces liquides, fréquences de travail, vitesses de glissement et deux rayons de sphère différents. Ces résultats fournissent des informations précieuses sur les phénomènes interfaciaux et améliorent la compréhension des interactions entre l’écoulement des fluides et les interfaces molles
This thesis investigates the interplay between fluid flow and interfacial deformation using Atomic Force Microscopy (AFM). First, AFM was employed to explore the resonant thermal capillary fluctuations (RTCF) of bubble and drop surfaces, enabling the measurement of surface elasticity and bulk viscosity in surfactant-laden air/water interfaces and polymer solutions. These measurements extended the frequency range for rheological investigations, effectively overcoming the limitations of classical rheometers.Next, we introduced a non-contact method to assess the mechanical properties of living cells based on the elastohydrodynamic (EHD) interaction between the thermal vibrations of the AFM cantilever and the cell deformations. This method enabled the precise determination of the elastic modulus of a living cell for different frequencies.Finally, we conducted the first direct and quantitative measurement of the lift force acting on a sphere moving along a liquid-liquid interface. This force, arising from the coupling between viscous flow and capillary deformation of the interface, was measured as a function of the distance between the sphere and the interface using an atomic force microscope (AFM). We investigated various liquid interfaces, working frequencies, sliding velocities, and two different sphere radii. The findings provide valuable insights into interfacial phenomena and enhance the understanding of interactions between fluid flow and soft interfaces

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Livres sur le sujet "Interfacial deformation"

Thermocapillary flow with evaporation and condensation at low gravit. [Washington, DC : National Aeronautics and Space Administration, 1995.

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Kudinov, V. V., N. V. Korneeva et I. K. Krylov. Effect of components on the properties of composite materials. Nauka Publishers, 2021. http://dx.doi.org/10.7868/9785020408654.

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Methods for the creation and characteristics of composite materials reinforced with carbon, aramid and UHMWPE-fibers based on polymer matrices are considered. The properties of more than 50 composite materials are given. Technologies for their production from wound nonwoven and woven fiber reinforcements are proposed, with regulation of activation, composition and arrangement of components in the material. Experimental methods for studying polymer com- posites, such as wet-pull-out (W-P-O), full-pull-out (F-P-O) and impact break (IB) have been developed. It allows one to study the interfacial interaction of components during the creation of CM, regulate the activation of fibers by non-equilibrium low-temperature plasma and fluo rination, and analyze mechanisms of deformation and destruction of CM, in statics and upon impact with the help of uniform universal samples. Monograph – reference book is intended for scientific and engineering staff, teachers, stu- dents, graduate students, and inventors involved in the development, production and use of poly mer composite materials.

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Chapitres de livres sur le sujet "Interfacial deformation"

Aust, K. T., U. Erb et G. Palumbo. « Interfacial Structures and Properties ». Dans Mechanical Properties and Deformation Behavior of Materials Having Ultra-Fine Microstructures, 107–28. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1765-4_5.

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Buisson, M., E. Patoor et M. Berveiller. « Constitutive Equations for Deformations Induced by Interfacial Motions ». Dans Anisotropy and Localization of Plastic Deformation, 536–39. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_124.

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Balasubramaniam, R. « Unsteady Thermocapillary Flow and Free Surface Deformation in a Thin Liquid Layer ». Dans Interfacial Fluid Dynamics and Transport Processes, 201–12. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45095-5_10.

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Moran, B., M. Gosz et J. D. Achenbach. « Effect of a Viscoelastic Interfacial Zone on the Mechanical Behavior and Failure of Fiber-Reinforced Composites ». Dans Inelastic Deformation of Composite Materials, 35–49. New York, NY : Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4613-9109-8_2.

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Shibutani, Yoji, Hiroshi Kitagawa et Takayuki Nakamura. « Growth of interfacial inhomogeneous deformation in thin laminated material subjected to biaxial tension ». Dans Large Plastic Deformations, 261–69. London : Routledge, 2021. http://dx.doi.org/10.1201/9780203749173-29.

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Barrett, Christopher, et Haitham El Kadiri. « The Deformation Gradient of Interfacial Defects on Twin-like Interfaces ». Dans Magnesium Technology 2015, 121–25. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093428.ch24.

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Zinemanas, Daniel, et Avinoam Nir. « A Dynamic Free Surface Deformation Driven by Anisotropic Interfacial Forces ». Dans Variational Methods for Free Surface Interfaces, 165–72. New York, NY : Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-4656-5_19.

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Barrett, Christopher, et Haitham El Kadiri. « The Deformation Gradient of Interfacial Defects on Twin-like Interfaces ». Dans Magnesium Technology 2015, 121–25. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48185-2_24.

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Zeng, Tongyan, Essam F. Abo-Serie, Manus Henry et James Jewkes. « Thermal Optimisation Model for Cooling Channel Design Using the Adjoint Method in 3D Printed Aluminium Die-Casting Tools ». Dans Springer Proceedings in Energy, 333–40. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30960-1_31.

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AbstractIn the present study, the adjoint method is introduced to the optimisation of the corner cooling element in two baseline cooling designs for a mould cavity, as examples of the Aluminium metal die-casting process. First, a steady thermal model simulating the Aluminium die-casting process is introduced for the two-corner cooling design scenario. This steady model serves as the first iteration of the optimised model using the adjoint method. A dual-parameter objective function targets the interfacial temperature standard deviation and pressure drop across the internal cooling region. For both design cases, multi-iterative deformation cycles of the corner cooling configurations result in optimised designs with non-uniform cross-section geometries and smooth surface finishing. Numerical simulations of the resulting designs show improvements in uniform cooling across the mould/cast interfacial contact surface by 66.13% and 92.65%, while the optimised pressure drop increases coolant fluid flow by 25.81% and 20.35% respectively. This technique has been applied to optimise the complex cooling system for an industrial high-pressure aluminium die-casting (HPADC) tool (Zeng et al. in SAE Technical Paper 2022-01-0246, 2022, [1]). Production line experience demonstrates that the optimised designs have three times the operational life compared to conventional mould designs, providing a significant reduction in manufacturing and operation costs.

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Hagiwara, Yoshimichi. « Numerical Simulation of the Velocity Fluctuation and the Interfacial Deformation of Liquid-Liquid Dispersed Two-Phase Flow ». Dans Fluid Mechanics and Its Applications, 179–83. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0457-9_34.

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Actes de conférences sur le sujet "Interfacial deformation"

Váradi, Károly, Zoltán Néder, Klaus Friedrich et Joachim Flöck. « Finite Element Contact, Stress and Strain Analysis of a Composite Fibre-Matrix Micro System Subjected to Ball Indentation ». Dans ASME 1997 International Mechanical Engineering Congress and Exposition, 23–36. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1340.

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Abstract The presented FE contact technique is applied to the problem of a steel ball indented into a composite material consisting of unidirectional continuous carbon fibres in a polyetheretherketone matrix. Indentation was carried out with fibre orientations either normal (N) or parallel (P) to the contact surface at fiber volume fraction 44%. The FE contact stress analysis of a fibre/matrix micro structure has some strong limitations. If FE micro models are used, only a very small (for example 0.1 × 0.1 × 0.1 mm) 3D segment can be modelled while the number of degrees of freedom (DOF) is immediately in the range of 100.000. If anisotropic numerical models are used, there are no size limitations but the results can not describe the stress and strain states of a real fibre/matrix micro structure. The FE contact analysis involves both an anisotropic (homogeneous) macro and (inhomogeneous) micro contact analysis, following an approximate displacement coupling technique. This technique considers only the displacements along the coupled surfaces. The coupled solution provides a more realistic elastic deformation, stress and strain results of the composite micro system in the vicinity of the contact area, and at the same time the effect of the macro system is also incorporated. The FE contact results show the location and the distribution of the subsurface stresses and strains. For N fibre orientation there is a high shear stress region below the surface, from where the fibre/matrix interfacial failure initiates before propagation to the surface. These results are in good agreement with experimental results published in the open literature. In case of P fibre orientation the matrix is subjected to local plastic deformation while the characteristic deformation of the fibre is bending.

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Ito, Hideaki, Tsutomu Ezumi, Susumu Takahashi et Kazuo Sato. « Impact shearing deformation behavior of interfacial crack in ENF test specimen ». Dans 24th International Congress on High-Speed Photography and Photonics, sous la direction de Kazuyoshi Takayama, Tsutomo Saito, Harald Kleine et Eugene V. Timofeev. SPIE, 2001. http://dx.doi.org/10.1117/12.424261.

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Jenn-Ming Song, Chien-Wei Su, Yi-Shao Lai et Ying-Ta Chiu. « Time dependent deformation behavior of interfacial intermetallic compounds in electronic solder joints ». Dans 2009 4th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT). IEEE, 2009. http://dx.doi.org/10.1109/impact.2009.5382227.

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Heffes, M. J., et H. F. Nied. « Analysis of Interface Cracking in Flip Chip Packages With Viscoplastic Solder Deformation ». Dans ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35346.

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This paper examines the modeling of viscoplastic solder behavior in the vicinity of interfacial cracking for flip chip semiconductor packages. Of particular interest is the relationship between viscoplastic deformation in the solder bumps and any possible interface cracking between the epoxy underfill layer and the silicon die. A 3-D finite element code, developed specifically for the study of interfacial fracture problems, was modified to study how viscoplastic solder material properties would affect fracture parameters such as strain energy release rate and phase angle for nearby interfacial cracks. Simplified two-layer periodic symmetry models were developed to investigate these interactions. Comparison of flip chip results using different solder material models showed that viscoplastic models yielded lower stress and fracture parameters than time independent elastic-plastic simulations. It was also found that adding second level attachment greatly increases the magnitude of the solder strain and fracture parameters. As expected, the viscoplastic and temperature dependent elastic-plastic results exhibited greater similarity to each other than results based solely on linear elastic properties.

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Handoko, R. A., J. L. Beuth, M. J. Stiger, F. S. Pettit et G. H. Meier. « Mechanisms for Interfacial Toughness Loss in Thermal Barrier Coating Systems ». Dans ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2685.

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Abstract A major concern with thermal barrier coatings (TBCs) is their loss of adhesion during service, leading to spallation. In this research, an indentation test is used to quantify decreases in interfacial toughness of TBC systems as a function of the duration of isothermal or cyclic high-temperature exposures. A detailed description is given of the indentation test, which involves penetration of the TBC and the oxide layer below it, inducing plastic deformation in the underlying metal bond coat and superalloy substrate. This plastic deformation induces a compressive radial stress away from the indent, which drives an axisymmetric delamination of the TBC and oxide layers. Detailed elastic-plastic model results are presented which allow determination of the toughness of the oxide/bond coat interface from a measured radius of delamination.

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Sharifi Kia, Danial, Shahrzad Towfighian et Congrui Jin. « Predicting the Output of a Triboelectric Energy Harvester Undergoing Mechanical Pressure ». Dans ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9157.

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Energy harvesting using a triboelectric nanogenerator (TENG) has been a major area of research in the recent years in order to harvest mechanical energy in different scales. High energy conversion efficiency, broad range of application in different systems and relatively easy fabrication process are among the factors demonstrating essential needs for TENG technology development. Performance of a TENG could be affected by many factors such as the frequency of vibration and the surface charge density. As a key factor in improving the power output of TENGs, surface charge density could be modified by the selection of proper charging materials and by increasing the contact area between the tribo-pairs. Although there have been numerous studies analyzing the performance of different tribo-pairs and different interfacial structures for a TENG, a systematical analysis of the contact phenomena between the interfacial structures in order to investigate the effects of different surface properties and structures such as, surface roughness, dielectric properties or the presence of nanostructures is still not available. In the current study, systematical numerical simulations have been performed on the adhesive contact behavior of the macro/nanostructures at the TENG interface. An interaction potential has been used to represent the adhesive interactions while surface deformations are coupled using half-space Green’s function. Furthermore, effects of the deformation of the interfacial structure on the performance and output of the TENG has been investigated by developing a theoretical model for a vertical-contact-mode TENG using a mass-spring system to represent the motion of the moving electrode. Coupling the theoretical model to the instantaneous deformation of the interfacial structure, real-time output of the TENG in terms of short-circuit voltage and open-circuit current has been studied in response to a predefined pressure input. The results of the current study demonstrate the effects of the deformation of the interfacial structure on the output characteristics of TENGs during the transition between partial-contact to full-contact modes. Numerical simulation results represent acceptable correlations with previously reported experimental data. The simulation package developed in this study is capable of simulating the contact behavior of the interfacial structure and predicting the deformed geometry.

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Hossein, Mohammad A., Yue Zhang et Arend van der Zande. « Three-dimensional deformation and stretchable photonics enabled by interfacial slip in 2D material heterostructures ». Dans Physical Chemistry of Semiconductor Materials and Interfaces IX, sous la direction de Daniel Congreve, Christian Nielsen et Andrew J. Musser. SPIE, 2020. http://dx.doi.org/10.1117/12.2567539.

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Utiugov, Grigorii, et Vladimir Chirkov. « The Change in Interfacial Tension Over Time and Its Effect on the Droplet Deformation Dynamics ». Dans 2022 IEEE 21st International Conference on Dielectric Liquids (ICDL). IEEE, 2022. http://dx.doi.org/10.1109/icdl49583.2022.9830945.

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Seol, Myeong-Lok, Jin-Woo Han, Jong-Ho Woo, Dong-Il Moon, Jee-Yeon Kim et Yang-Kyu Choi. « Comprehensive analysis of deformation of interfacial micro-nano structure by applied force in triboelectric energy harvester ». Dans 2014 IEEE International Electron Devices Meeting (IEDM). IEEE, 2014. http://dx.doi.org/10.1109/iedm.2014.7047010.

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Yang, J., et K. Komvopoulos. « A Mechanics Approach to Static Friction of Elastic-Plastic Fractal Surfaces ». Dans ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64271.

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A contact mechanics theory of static friction is presented for isotropic rough surfaces exhibiting fractal behavior. The analysis is based on a piece-wise power-law size distribution and a normal slope distribution of the asperity contacts and elastic-fully plastic deformation models. Numerical integration yields solutions for the normal and friction forces in terms of fractal parameters, elastic-plastic material properties, and interfacial shear strength. The variation of the static coefficient of friction with normal load is related to the effect of the surface topography on the dominant deformation mode at the asperity contacts. Plastic deformation of the smaller asperity contacts dominates at low loads and elastic deformation of the larger asperity contacts at high loads. The critical load signifying the transition from predominantly plastic to elastic deformation depends on the fractal parameters and material properties. In the low-load range, the static coefficient of friction decreases with the increase of the load, while in the high-load range it increases relatively faster with the load. Numerical results for copper fractal surfaces illustrate the effects of normal load, surface topography, and interfacial shear strength on the static coefficient of friction.

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Rapports d'organisations sur le sujet "Interfacial deformation"

Hsiung, L. Interfacial Control of Deformation Twinning in Creep-Deformed TiAl/Ti3Al Nanolaminate. Office of Scientific and Technical Information (OSTI), novembre 2004. http://dx.doi.org/10.2172/15014527.

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DEFORMATION OF STEEL-BAMBOO COMPOSITE BEAM CONSIDERING THE EFFECT OF INTERFACIAL SLIPPAGE. The Hong Kong Institute of Steel Construction, septembre 2018. http://dx.doi.org/10.18057/ijasc.2018.14.3.1.

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