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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of Wall Slip in Extrusion of Ceramic Pastes (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 206-213 (Dec. 2001), p. 321-324 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/45/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.206-213.321.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Einige Erhaltungssätze der Kontinuumsmechanik vom J-Integral-Typ (1981)
    Springer
    Archive of applied mechanics 50 (1981), S. 103-111 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Conservation laws in terms of surface integrals are derived from the translation respectively rotation invariance of general balance equations of continuum mechanics. From them conservation quantities of J-Integral type follow for the energy balance. They reduce to simpler forms in the cases of statics, of stationary plane waves and of hyperelasticity. When there are mobile energy sources like defects, then the force acting on the source is described by the conservation integrals.
    Notes: Übersicht Aus der Translations- und Rotationsinvarianz der allgemeinen Bilanzgleichung der Kontinuums-mechanik werden Erhaltungssätze in Form von Oberflächenintegralen hergeleitet. Für die Energiebilanz folgen daraus Erhaltungsgrößen vom J-Integral-Typ, die sich in den Fällen der Statik, der stationären ebenen Welle und der Hyperelastizität besonders vereinfachen. Sind bewegliche Energiequellen, wie Defekte vorhanden, so wird durch die Erhaltungsintegrale die Kraft auf die Quelle beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539693
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  • 3
    Electronic Resource
    Electronic Resource
    Ein rheometer zur untersuchung von flüssigen polymermaterialien in einachsiger und zweiachsiger Dehnung (1992)
    Springer
    Rheologica acta 31 (1992), S. 283-293 
    Details
    ISSN: 1435-1528
    Keywords: Elongational rheometer ; uniaxial and biaxial elongation ; bubble injection ; polyisobutylene ; damping function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Abstract We present a novel elongational rheometer for uniaxial and equibiaxial extension of polymeric liquids. The apparatus makes use of a growing or collapsing spherically symmetric bubble surrounded by a large amount of the polymeric liquid to be measured. The bubble is generated by injection of a low-viscosity immiscible liquid. The injection pressure is measured with the deformation rate of the bubble surface prescribed. The method is capable of reproducing the Newtonian viscosity and the linear viscoelasticity of comparatively low molecular weight silicone oils in excellent agreement with shear measurements. For materials strongly behaving nonlinear viscoelastically, we calculate Wagner's damping function. Our results agree well with measurements made by Demarmels and Meißner using the rotary clamp technique for the polyisobutylene melt Oppanol B 15. Within the range of experimental and calculatory incertainties we find the same damping function for three polyisobutylenes of different molecular weights.
    Notes: Zusammenfassung Wir stellen ein neues Dehnrheometer vor, mit dem sowohl einachsige als auch zweiachsige Dehnexperimente an flüssigen Polymermaterialien durchgeführt werden können. Bei der Apparatur wird das Prinzip der „atmenden Blase” verwendet: Über eine Düse wird in das zu untersuchende Material eine kugelförmige Blase aus einer niederviskosen, inkompressiblen, unmischbaren Flüssigkeit injiziert. Wachstum bzw. Schrumpfen dieser Blase führt zu einer zweiachsigen bzw. einachsigen Dehndeformation der umgebenden Polymerflüssigkeit. Der Injektionsdruck dient als Meßgröße zur Bestimmung der viskoelastischen Eigenschaften des Probenmaterials. Bei vergleichsweise niederviskosen Silikonölen gelingt die Messung der Nullviskosität bzw. der linear viskoelastischen Eigenschaften in guter Übereinstimmung mit Scherexperimenten. Bei Materialien mit ausgeprägt nichtlinear viskoelastischem Verhalten kann unter Anwendung des Wagner-Modells die Dämpfungsfunktion für ein- und zweiachsige Dehnung ermittelt werden. Unsere Ergebnisse für das Polyisobutylen Oppanol B 15 stimmen mit Messungen von Demarmels und Meißner überein, die mit der Methode der „Rotierenden Klemmen” durchgeführt werden. Für drei Polyisobutylene unterschiedlichen Molekulargewichts ergibt sich im Rahmen der Meßgenauigkeit die gleiche Dämpfungsfunktion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366507
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  • 4
    Electronic Resource
    Electronic Resource
    Extremalprinzipe der Thermodynamik und Mechanik für stabile Gleichgewichtslagen von Kontinua (1972)
    Springer
    Archive of applied mechanics 41 (1972), S. 357-366 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The aim of this paper is to study the relations between the variational principles of thermodynamics and mechanics for stable equilibrium states of a deformable body. As a by-product one obtains generalisations of the “classical” principles of elasticity-theory (the minimum-energy-principle and Castigliano's theorem) to multipolar and chemically reacting materials.
    Notes: Übersicht In dieser Arbeit soll der Zusammenhang zwischen den Extremalprinzipien der Thermodynamik und der Mechanik für stabile Gleichgewichtszustände eines Kontinuums studiert werden. Als Nebenprodukt ergeben sich dabei zwanglos Verallgemeinerungen der „klassischen” Extremalprinzipe der Elastizitätstheorie (des Minimum-Energie-Prinzips und des Prinzips von Castigliano) auf multipolare und chemisch reagierende Materialien.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00533082
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Birefringence measurements in extensional flow of polyisobutylene around an expanding bubble (1998)
    Springer
    Rheologica acta 37 (1998), S. 182-188 
    Details
    ISSN: 1435-1528
    Keywords: Key words Polymer melts ; viscoelasticity ; birefringence ; elongational flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Birefringence in liquid polymers offers the possibility of obtaining information about stress in complex flows. In this work, this is done for extensional flows of polyisobutylene in a “breathing bubble” rheometer. In this type of rheometer, a bubble consisting of an incompressible, low-viscosity fluid (usually water) is injected into the sample with a nozzle. Expanding or collapsing the bubble by adding or removing water induces biaxial or uniaxial extension in the surrounding sample. The pressure difference between the bubble and the surroundings can be measured and compared to the predictions of constitutive equations. This measurement only gives one integral value for a complex flow history. In this paper, the birefringence around the bubble is measured in order to learn more about the flow. This is done by comparing pressure and birefringence results to those of standard constitutive equations for a polyisobutylene sample. A good agreement between the pressure and optical measurements and the theory is found with a single value of the stress-optical constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003970050104
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  • 7
    Electronic Resource
    Electronic Resource
    Parameter identification for viscoelastic materials (1988)
    Springer
    Rheologica acta 27 (1988), S. 363-368 
    Details
    ISSN: 1435-1528
    Keywords: Boltzmann-Volterra material ; stress-strain relation ; relaxation experiment ; parameter identification ; principle ofinertia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Starting from the general stress-strain relation for a linear Boltzmann-Volterra material, which is in agreement with the “principle of inertia”, a new identification procedure is proposed. Instead of running one long-range relaxation experiment, following asingle suitably specified deformation history, material characterization is done using the data ofn short relaxation experiments followingn different deformation histories. To interpret these data a direct non-iterative algorithm has been developed. Compared with other methods, for example curve fitting by using Gauss' method, this direct method is numerically stable and allows a simple direct evaluation of the error due to the scattering of experimental data. The method has been applied to the determination of the relaxation times of an unsaturated polyester material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332157
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  • 8
    Electronic Resource
    Electronic Resource
    84. Gleitverhalten von Aluminiumoxid-Siliconöl-Pasten bei der Extrusion (1999)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 71 (1999), S. 994-995 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330710988
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  • 9
    Electronic Resource
    Electronic Resource
    Einfluß der Bindemittel- und Feststofffraktion auf das Flockenwachstum bei der Agglomeration in Flüssigkeiten (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1143-1143 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330670987
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  • 10
    Electronic Resource
    Electronic Resource
    Mögliche Auswirkungen einer Diffusion von Strukturelementen auf die Rheologie von ScherströmungenVortrag von H. BUGGISCH anläßlich der Arbeitssitzung des GVC-Fachausschusses „Rheologie“, 27./28. Februar 1997 in Würzburg. (1998)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 70 (1998), S. 283-286 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330700312
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