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  • 1
    Electronic Resource
    Electronic Resource
    The yield behavior of PVDF and the deformation process at high temperature (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 219-226 
    Details
    ISSN: 1435-1536
    Keywords: PVDF ; yielding ; rate process ; threshold stress ; deformation mechanism ; rejuvenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Tensile yield stress measurement on polyvinylidene fluoride are presented covering as many as seven decades of strain-rates at temperatures from −50° to 150°C. The data have been analyzed on the basis of four Ree-Eyring processes acting in parallel, three of which have been identified. At high temperatures and low strain-rates, a threshold yield stress is observed. A model is proposed, allowing to describe the yield behavior both at the threshold and in its adjacent strain-rate dependent range. It consists in a modification of the Ree-Eyring theory using an unsymmetrical free energy barrier for the rate process. The data are fully consistent with the above model which implies that yielding occurs only when the stress is higher than a threshold. In this case, a rejuvenation (or de-aging) effect must be assumed in the deformation process which could consist in a melting of a chain segment located between two folds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657827
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  • 2
    Electronic Resource
    Electronic Resource
    Fractal rheological models and fractional differential equations for viscoelastic behavior (1994)
    Springer
    Rheologica acta 33 (1994), S. 210-219 
    Details
    ISSN: 1435-1528
    Keywords: Constitutive equation ; fractional differintegral ; fractal model ; viscoelasticity ; polymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A constitutive equation for viscoelastic behavior containing time derivatives of stress and strain to fractional order is obtained from a fractal rheological model. Equivalence between tree and ladder fractal models at long times is demonstrated. The fractional differential equation is shown to be equivalent to ordinary differential formulations in the case of a simple power-law response; the adequacy of such formulations to describe non-linearity has been demonstrated previously. The model gives a good description of viscoelastic behavior under all stress modes and will be extended in future to include aging effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437306
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  • 3
    Electronic Resource
    Electronic Resource
    Two nearly equivalent approaches for describing the non-linear creep behavior of glassy polymers (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 537-542 
    Details
    ISSN: 1435-1536
    Keywords: Creep ; stretched exponential law ; rejuvenation ; structural temperature ; ladder model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two approaches are proposed to account for the creep curve of glassy polymers under high applied stress; one is analytical, the other is in the form of a ladder mechanical model. Both approaches consider that creep deformation induces the rejuvenation of the sample, giving rise to faster kinetics, and they predict an inflection in the creep curve. The related responses were found to fit experimental data better than the stretched exponential law, especially at high strain. The mechanical model must be preferred because it is hierarchical, which is useful for visualization and allows memory effects to be taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658284
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  • 4
    Electronic Resource
    Electronic Resource
    Déformation plastique du polyéthylène haute densité soumis des essais de traction-torsion (1974)
    Springer
    Rheologica acta 13 (1974), S. 93-98 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01526890
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  • 5
    Electronic Resource
    Electronic Resource
    Etude du comportement en traction de bitumes en fonction de la température et de la vitesse de sollicitation (1976)
    Springer
    Rheologica acta 15 (1976), S. 195-198 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Das Verhalten von vier Bitumina, die in einem sehr weiten Bereich von Deformationsgeschwindigkeiten und Temperaturen untersucht wurden, zeigt deutlich, daß ihre im duktilen Bereiche liegende Zugfestigkeit mittels eines aus der Eyringschen Theorie der Aktivierungsprozesse abgeleiteten Formalismus beschrieben werden kann.
    Notes: Summary The tensile behaviour of four grades of asphalt is investigated at various temperatures over a wide range of strain rates. It is shown that their ultimate tensile stress in the ductile range can be properly described by the formalism of Eyring's theory of activated rate processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01526067
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  • 6
    Electronic Resource
    Electronic Resource
    Fatigue crack growth in poly (vinyl chloride) (1971)
    Springer
    International journal of fracture 7 (1971), S. 277-287 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Our measurements on fatigue cracks grown in PVC under plane-strain conditions shows that the width of the observed arrest lines is in agreement with the theoretical results obtained from the Dugdale-Muskhelishvili model. Further, we have shown that the fatigue of one arrest line before rupture requires a large number of loading cycles this number of cycles is constant for every arrest line of a given specimen. Brittle fracture of the specimen occurs when the “stress-intensity factor” K first introduced by Irwin reaches a given value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00184304
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  • 7
    Electronic Resource
    Electronic Resource
    The mechanism of creep behaviour in glassy polymers (1975)
    Springer
    Journal of materials science 10 (1975), S. 1779-1787 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A model is presented to describe the creep behaviour of glassy polymers below the glass transition temperature. It consists of a Hookean spring in series with a non-Newtonian dashpot having an entropy spring in parallel. The shape of the response of this spring is deduced from a master curve, giving the extension as a function of logarithm of time, built from creep data, reported here and obtained on polycarbonate over a wide range of times and temperatures. The model takes into account a number of aspects of creep behaviour and predicts a threshold stress beneath which delayed yielding no longer occurs. Torsional creep data, obtained on Polyvinylchloride by Mallon and Benham are found to be in excellent agreement with the proposed model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554940
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of stress and temperature on dry craze growth kinetics during low-stress creep of polycarbonate (1976)
    Springer
    Journal of materials science 11 (1976), S. 7-16 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A model for craze growth is presented, based on stress and strain analysis around a craze and on rheological properties of craze matter. This model is shown to account quantitatively for observed growth rates, and to be in agreement with the variation of the delay time for crazing in polycarbonate with stress and temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541068
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  • 9
    Electronic Resource
    Electronic Resource
    The relationship between the effect of thermal pre-treatment and the viscoelastic behaviour of polycarbonate in the glassy state (1979)
    Springer
    Journal of materials science 14 (1979), S. 1817-1826 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The viscoelastic behaviour of three different samples of polycarbonate, with differing pre-treatment, is described here by a generalized non-linear Maxwell system, proposed previously. This model gives the variation of the tensile yield stress related to each sample as a function of temperature and strain rate. The response is checked over a large range of strain rates, at temperatures from 20 to 80° C. The model allows the determination of the damping peak arising from the molecular movements which it expresses. A correspondence is found with the intermediate loss peak location, which occurs for each sample just below the α transition. Results obtained from dynamic mechanical tests and differential scanning calorimetry show that the structure of the samples changes in the range of temperatures where the intermediate loss peak arises at 1 Hz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551020
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of stress and temperature on dry craze growth kinetics during low-stress creep of polycarbonate (1976)
    Springer
    Journal of materials science 11 (1976), S. 1-6 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Craze growth kinetics in polycarbonate are studied over a wide range of stress and temperature. The delay time for appearance of crazing is found to vary with stress and temperature following a rate process equation. Activation energy and activation volume are smaller for crazing than for shear-resolvable yielding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541067
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