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  • Articles  (15)
  • Other Sources
  • viscoelasticity  (15)
  • Springer  (15)
  • American Geophysical Union
  • American Institute of Physics (AIP)
  • American Physical Society
  • Blackwell Publishing Ltd
  • Institute of Physics
  • Oxford University Press
  • Wiley-Blackwell
  • 2000-2004
  • 1995-1999  (15)
  • 1945-1949
  • 1997  (15)
  • Physics  (15)
  • Natural Sciences in General
  • Electrical Engineering, Measurement and Control Technology
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  • Articles  (15)
  • Other Sources
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  • Springer  (15)
  • American Geophysical Union
  • American Institute of Physics (AIP)
  • American Physical Society
  • Blackwell Publishing Ltd
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  • 2000-2004
  • 1995-1999  (15)
  • 1945-1949
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  • 1
    Electronic Resource
    Electronic Resource
    Strain hardening of fibrin gels and plasma clots (1997)
    Springer
    Rheologica acta 36 (1997), S. 262-268 
    Details
    ISSN: 1435-1528
    Keywords: Fibrin ; viscoelasticity ; strain hardening ; clot retraction ; platelets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Biological macromolecules have unique rheological properties that distinguish them from common synthetic polymers. Among these, fibrin has been studied extensively to understand the basic mechanisms of viscoelasticity as well as molecular mechanisms of coagulation disorders. One aspect of fibrin gel rheology that is not observed in most polymeric systems is strain hardening: an increase in shear modulus at strain amplitudes above 10%. Fibrin clots and plasma clots devoid of platelets exhibit shear moduli at strains of approximately 50% that are as much as 20 times the moduli at small strains. The strain hardening of fibrin gels was eliminated by the addition of platelets, which caused a large increase in shear storage modulus in the low strain linear viscoelastic limit. The reduction in strain hardening may result from fibrin strand retraction which occurs when platelets become activated. This interpretation is in agreement with recent theoretical treatments of semi-flexible polymer network viscoelasticity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366667
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  • 2
    Electronic Resource
    Electronic Resource
    Square root singularity in the viscosity of neutral colloidal suspensions at large frequencies (1997)
    Springer
    Journal of statistical physics 87 (1997), S. 1037-1049 
    Details
    ISSN: 1572-9613
    Keywords: Viscosity ; viscoelasticity ; rheology ; colloidal suspensions ; hardspheres ; softspheres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The asymptotic frequency, ω, dependence of the dynamic viscosity of neutral hard-sphere colloidal suspensions is shown to be of the formη 0A(ϕ)(ωτp)-1/2, whereA(ϕ) has been determined as a function of the volume fraction ϕ, for all concentrations in the fluid range,η 0 is the solvent viscosity, andτ p is the Péclet time. For a soft potential it is shown that, to leading order in the steepness, the asymptotic behavior is the same as that for the hard-sphere potential and a condition for the crossover behavior to 1/ωτp, is given. Our result for the hardsphere potential generalizes a result of Cichocki and Felderhof obtained at low concentrations and agrees well with the experiments of van der Werffet al. if the usual Stokes-Einstein diffusion coefficientD 0 in the Smoluchowski operator is consistently replaced by the short-time self-diffusion coefficientD s(ϕ) for nondilute colloidal suspensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181269
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  • 3
    Electronic Resource
    Electronic Resource
    Some identity relations between plane problems for visco- and elasticity (1997)
    Springer
    Applied mathematics and mechanics 18 (1997), S. 1159-1167 
    Details
    ISSN: 1573-2754
    Keywords: viscoelasticity ; plane problem ; Airy stress function ; identity relation ; integral constitutive relation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In this paper, the boundary value problems of plane problems with a simply- or multiply-connected domain for isotropic linear visco-elasticity are first established by terms of Airy stress function F(x0 t). Secondly some identity relations between displacements and stresses for plane problems of visco- and elasticity are discussed in detail and some meaningful conclusions are obtained. As an example, the deformation response for viscoelastic plate with a small circular hole at the center is analyzed under a uniaxial uniform extension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713718
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  • 4
    Electronic Resource
    Electronic Resource
    Boundary element method for solving dynamical response of viscoelastic thin plate (I) (1997)
    Springer
    Applied mathematics and mechanics 18 (1997), S. 229-235 
    Details
    ISSN: 1573-2754
    Keywords: dynamic response ; viscoelasticity ; BEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In this paper, a boundary element method for solving dynamical response of viscoelastic thin plate is given. In Laplace domain, we propose two methods to approximate the fundamental solution and develop the corresponding boundary element method. Then using the improved Bellman's numerical inversion of the Laplace transform, the solution of the original problem is obtained. The numerical results show that this method has higher accuracy and faster convergence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453365
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  • 5
    Electronic Resource
    Electronic Resource
    Viscoelasticity and diffusion in miscible blends of saturated hydrocarbon polymers (1997)
    Springer
    Rheologica acta 36 (1997), S. 217-228 
    Details
    ISSN: 1435-1528
    Keywords: Polymer melts ; miscible blends ; viscoelasticity ; tracer diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Linear viscoelasticity and tracer diffusion were investigated as functions of temperature, component molecular weight and blend composition for entangled, single-phase blends of nearly monodisperse poly(ethylene-alt-propylene) (PEP) and head-to-head polypropylene (HHPP). Both components are non-polar and, despite evidence for slight differences of component glass temperatures in their blends, the viscoelastic data obey time-temperature superposition rather well. The properties of the blends were compared at constant T-T g (blend) with predictions of the tube-model theories. The composition dependence of viscosity agrees best with the double-reptation prediction, as had been found earlier for molecular weight blends. The variation in plateau modulus with composition is consistent with reptation, but the changes are too small to provide a definitive test. The tracer diffusion coefficients, D * PEP and D * HHPP are nearly independent of composition, consistent with the reptation prediction and in sharp contrast with tracer diffusion for blends with specific associations. Results for the recoverable compliance depart from this pattern, varying differently and much less strongly with composition than the predictions of either single or double reptation. It thus seems that microstructural blends may behave in significantly more complex ways than molecular weight blends even for components with only weak dispersive interactions and rather modest differences in glass temperature and plateau modulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366662
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and dynamics of ovalbumin gels (1997)
    Springer
    Rheologica acta 36 (1997), S. 252-261 
    Details
    ISSN: 1435-1528
    Keywords: Ovalbumin ; gelation ; viscoelasticity ; SEM ; thermal behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Solvent effects on dynamical and thermal behaviors of ovalbumin (OVA) gels induced by thermal denaturation at high temperature of 160°C were studied from dynamic shear modulus measurement, shear creep and creep recovery measurement, and DSC measurement. Two organic solvents, glycerin (G) and ethylene glycol (EG), and their mixtures with water (W)(G/W and EG/W) were used as solvent for preparation of gels. Stable gels formed in pure glycerin took a fractal structure at OVA concentration C range of 15–45wt% at a temperature specific to respective C, whereas a fractal structure was not observed for gels prepared in EG, G/W, and EG/W. The results were consistent with thermal denaturation behaviors of OVA in these solvents. Morphologies of two gels prepared in water and glycerin were explored using high resolution SEM, which showed that a basic unit responsible for formation of OVA gels was spheres with a diameter ranging from 20 to 40 nm, being much larger than 5.6 nm of the diameter of native OVA, and a fractal structure was related to network formation accompanied by melting of those spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366666
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  • 7
    Electronic Resource
    Electronic Resource
    Viscoelasticity and diffusion in miscible blends of saturated hydrocarbon polymers (1997)
    Springer
    Rheologica acta 36 (1997), S. 217-228 
    Details
    ISSN: 1435-1528
    Keywords: Key words Polymer melts ; miscible blends ; viscoelasticity ; tracer diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Linear viscoelasticity and tracer diffusion were investigated as functions of temperature, component molecular weight and blend composition for entangled, single-phase blends of nearly monodisperse poly(ethylene-alt-propylene) (PEP) and head-to-head polypropylene (HHPP). Both components are non-polar and, despite evidence for slight differences of component glass temperatures in their blends, the viscoelastic data obey time-temperature superposition rather well. The properties of the blends were compared at constant T–T g (blend) with predictions of the tube-model theories. The composition dependence of viscosity agrees best with the double-reptation prediction, as had been found earlier for molecular weight blends. The variation in plateau modulus with composition is consistent with reptation, but the changes are too small to provide a definitive test. The tracer diffusion coefficients, D PEP * and D HHPP * are nearly independent of composition, consistent with the reptation prediction and in sharp contrast with tracer diffusion for blends with specific associations. Results for the recoverable compliance depart from this pattern, varying differently and much less strongly with composition than the predictions of either single or double reptation. It thus seems that microstructural blends may behave in significantly more complex ways than molecular weight blends even for components with only weak dispersive interactions and rather modest differences in glass temperature and plateau modulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366662
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  • 8
    Electronic Resource
    Electronic Resource
    Structure and dynamics of ovalbumin gels (1997)
    Springer
    Rheologica acta 36 (1997), S. 252-261 
    Details
    ISSN: 1435-1528
    Keywords: Key words Ovalbumin ; gelation ; viscoelasticity ; SEM ; thermal behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Solvent effects on dynamical and thermal behaviors of ovalbumin (OVA) gels induced by thermal denaturation at high temperature of 160°C were studied from dynamic shear modulus measurement, shear creep and creep recovery measurement, and DSC measurement. Two organic solvents, glycerin (G) and ethylene glycol (EG), and their mixtures with water (W)(G/W and EG/W) were used as solvent for preparation of gels. Stable gels formed in pure glycerin took a fractal structure at OVA concentration C range of 15–45wt% at a temperature specific to respective C, whereas a fractal structure was not observed for gels prepared in EG, G/W, and EG/W. The results were consistent with thermal denaturation behaviors of OVA in these solvents. Morphologies of two gels prepared in water and glycerin were explored using high resolution SEM, which showed that a basic unit responsible for formation of OVA gels was spheres with a diameter ranging from 20 to 40nm, being much larger than 5.6nm of the diameter of native OVA, and a fractal structure was related to network formation accompanied by melting of those spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366666
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  • 9
    Electronic Resource
    Electronic Resource
    Strain hardening of fibrin gels and plasma clots (1997)
    Springer
    Rheologica acta 36 (1997), S. 262-268 
    Details
    ISSN: 1435-1528
    Keywords: Key words Fibrin ; viscoelasticity ; strain hardening ; clot retraction ; platelets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Biological macromolecules have unique rheological properties that distinguish them from common synthetic polymers. Among these, fibrin has been studied extensively to understand the basic mechanisms of viscoelasticity as well as molecular mechanisms of coagulation disorders. One aspect of fibrin gel rheology that is not observed in most polymeric systems is strain hardening: an increase in shear modulus at strain amplitudes above 10%. Fibrin clots and plasma clots devoid of platelets exhibit shear moduli at strains of approximately 50% that are as much as 20 times the moduli at small strains. The strain hardening of fibrin gels was eliminated by the addition of platelets, which caused a large increase in shear storage modulus in the low strain linear viscoelastic limit. The reduction in strain hardening may result from fibrin strand retraction which occurs when platelets become activated. This interpretation is in agreement with recent theoretical treatments of semi-flexible polymer network viscoelasticity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366667
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  • 10
    Electronic Resource
    Electronic Resource
    Linear viscoelastic behavior of molten polymer blends: A comparative study of the Palierne and Lee and Park models (1997)
    Springer
    Rheologica acta 36 (1997), S. 416-428 
    Details
    ISSN: 1435-1528
    Keywords: Key words Blends ; linear ; viscoelasticity ; emulsion models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The linear viscoelastic properties of several molten blends with immiscible components of different viscosity ratio have been investigated. All the blends show a morphology of emulsion type. At low frequencies, the behaviors of these blends are essentially governed by the interface. The Palierne (1990) model is shown to well predict the linear behavior of all the blends. The Lee and Park model (1994), developed to take into account the relationship between the rheological behavior and morphological changes under large strain flows, is also shown to well describe the storage and loss moduli of the blends by adjusting a single fitting parameter. Based on the weighted relaxation spectra, a comparison of both model predictions is made focussing on the time associated to the interface. An approximate method is then proposed to evaluate the interface parameter introduced in the Lee and Park model. At high frequency, discrepancies are observed for the Lee and Park predictions when the viscoelastic properties of both components are considerably different. The description of the bulk properties of the blend, i.e., the mixing rule used by Lee and Park, is modified to obtain a better description of the high frequency data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396328
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  • 11
    Electronic Resource
    Electronic Resource
    Sticky dumbbells: from Hookean dumbbells to transient network (1997)
    Springer
    Rheologica acta 36 (1997), S. 534-543 
    Details
    ISSN: 1435-1528
    Keywords: Transient network ; Hookean dumbbell ; chemical rheology ; viscoelasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The Green-Tobolsky theory of transient networks is merged to the Hookean dumbbell model by considering Hookean sticky dumbbells, whose beads can randomly be stuck to a network submitted to affine deformation, or be set free from the network and undergo a free diffusive Brownian motion in the solvent. Sticking to and releasing from the network is treated as an instantaneous chemical reaction. This model has a closed-form solution, in which the stress is the sum of two (resp. three) Maxwellian codeformational relaxations for dumbbells with one (resp. two) sticking beads. When Brownian diffusion is faster than the chemical kinetics, one of the modes of two-sticking beads dumbbells is the Green-Tobolsky network relaxation, whereas the other modes correspond to fast configurational relaxations. In the opposite limit of fast chemical kinetics compared to Brownian relaxation, the effect of the network is to slow down the configurational response of Hookean dumbbells. Sticky dumbbells thus realise a continuous transition from Hookean dumbbells to transient networks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00368131
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  • 12
    Electronic Resource
    Electronic Resource
    The “decaying springs” model for irreversibility in polymer melts (1997)
    Springer
    Rheologica acta 36 (1997), S. 585-589 
    Details
    ISSN: 1435-1528
    Keywords: Polymer melts ; viscoelasticity ; constitutive equations ; irreversibility ; integral models ; thermorheological behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In this work, entanglements in a polymer melt are modeled as a system of parallel springs which form and decay spontaneously. The springs are assumed to be nonlinear, and a certain fraction of them is torn apart by a certain strain. Based on these assumptions, a model of behavior in simple shear is developed. This model is shown to predict a behavior comprising that of a Wagner fluid, and is generalized to a tensorial model of single integral type. The integrand depends on a product of a material function, modeling reversible behavior, and a material functional which takes irreversible processes into account. Irreversibility of network disentanglement, which may occur when deformation changes or reverses direction, can be modeled in this way. It is shown that the two well-known Wagner constitutive equations with and without irreversibility assumptions are special cases of the model developed. In case of a deformation which does not change directions, the new material function and the material functional are multiplied to yield Wagner's damping function. When the rate of spring formation is a function of temperature, the developed model is shown to predict thermorheologically simple behavior. A constitutive equation for non-isothermal flow of polymers is developed with this assumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00368136
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  • 13
    Electronic Resource
    Electronic Resource
    Sticky dumbbells: from Hookean dumbbells to transient network (1997)
    Springer
    Rheologica acta 36 (1997), S. 534-543 
    Details
    ISSN: 1435-1528
    Keywords: Key words Transient network ; Hookean dumbbell ; chemical rheology ; viscoelasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The Green-Tobolsky theory of transient networks is merged to the Hookean dumbbell model by considering Hookean sticky dumbbells, whose beads can randomly be stuck to a network submitted to affine deformation, or be set free from the network and undergo a free diffusive Brownian motion in the solvent. Sticking to and releasing from the network is treated as an instantaneous chemical reaction. This model has a closed-form solution, in which the stress is the sum of two (resp. three) Maxwellian codeformational relaxations for dumbbells with one (resp. two) sticking beads. When Brownian diffusion is faster than the chemical kinetics, one of the modes of two-sticking beads dumbbells is the Green-Tobolsky network relaxation, whereas the other modes correspond to fast configurational relaxations. In the opposite limit of fast chemical kinetics compared to Brownian relaxation, the effect of the network is to slow down the configurational response of Hookean dumbbells. Sticky dumbbells thus realise a continuous transition from Hookean dumbbells to transient networks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003970050068
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  • 14
    Electronic Resource
    Electronic Resource
    The „decaying springs” model for irreversibility in polymer melts (1997)
    Springer
    Rheologica acta 36 (1997), S. 585-589 
    Details
    ISSN: 1435-1528
    Keywords: Key words Polymer melts ; viscoelasticity ; constitutive equations ; irreversibility ; integral models ; thermorheological behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In this work, entanglements in a polymer melt are modeled as a system of parallel springs which form and decay spontaneously. The springs are assumed to be nonlinear, and a certain fraction of them is torn apart by a certain strain. Based on these assumptions, a model of behavior in simple shear is developed. This model is shown to predict a behavior comprising that of a Wagner fluid, and is generalized to a tensorial model of single integral type. The integrand depends on a product of a material function, modeling reversible behavior, and a material functional which takes irreversible processes into account. Irreversibility of network disentanglement, which may occur when deformation changes or reverses direction, can be modeled in this way. It is shown that the two well-known Wagner constitutive equations with and without irreversibility assumptions are special cases of the model developed. In case of a deformation which does not change directions, the new material function and the material functional are multiplied to yield Wagner’s damping function. When the rate of spring formation is a function of temperature, the developed model is shown to predict thermorheologically simple behavior. A constitutive equation for non-isothermal flow of polymers is developed with this assumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003970050073
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  • 15
    Electronic Resource
    Electronic Resource
    On Spatial Effects of Modelling in Linear Viscoelasticity (1997)
    Springer
    Journal of elasticity 47 (1997), S. 241-250 
    Details
    ISSN: 1573-2681
    Keywords: viscoelasticity ; monotone relaxation ; stability.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The parameters of a linear model of a viscoelastic material are determined by testing the material in homogeneous (i.e. spatially constant) states. Some of the qualitative properties of the behaviour of the material observed in the tests may be unexpectedly lost if the material is confined, so that the behaviour varies in space and is thus not homogeneous. One such property is the (Lyapunov) stability of the deformation. To ensure that the material possesses these properties it is necessary to impose some additional restrictions on the model parameters. These restrictions are found by analysing the boundary value problems for viscoelastic bodies of various shapes and subjected to various boundary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007498215650
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