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  • 1975-1979  (4)
  • 1970-1974  (3)
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  • 1
    facet.materialart.
    Unknown
    Theory of Viscoelasticity: An Introduction (1971)
    Academic
    In:  New York, Academic, vol. 2, no. 3, pp. 2-203, (ISBN 0-19-513895-3)
    Details
    Publication Date: 1971
    Keywords: Textbook of geophysics ; Rheology ; Inelastic ; Maxwell ; SLS ; Zener ; standard ; linear ; solid ; Attenuation ; QVAL
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
    Electronic Resource
    Electronic Resource
    A rate-dependent criterion for crack growth (1979)
    Springer
    International journal of fracture 15 (1979), S. 3-21 
    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
    Description / Table of Contents: Résumé On généralise le critère d'instabilité de Griffith pour la propagation d'une fissure afin de fournir un critère pour une croissance de fissure dépendant du temps. La procédure utilisée est similaire à celle de Griffith quand il en est fait usage pour un équilibre global de l'énergie. La méthode de Griffith est généralisée par l'insertion d'un terme de dissipation du taux énergétique dans la loi d'équilibre. Ce terme de taux de dissipation est dérivé afin de représentér le comportement des matériaux viscoélastiques; dès lors, les résultats finals sont principalement applicables au comportement des polymères. Les résultats finals consistent en des expressions analytiques concises pour exprimer la vitesses de propagation en fonction des propriétés de fluage du matériau, du niveau de contrainte et de l'énergie ou du travail associé aux nouvelles surfaces créées par la fissure en cours de propagation. Ces solutions analytiques sont tout à fait générales; la restriction première qui y est apportée procède du fait qu'elles sont dérivées de conditions asymptotiques pour des vitesses de fissuration élevées et lentes. Pour finir, on compare les prédictions analytiques avec les résultats expérimentaux dans le cas d'un élastomère polyuréthane.
    Notes: Abstract The Griffith instability criterion for crack propagation is generalized to provide a criterion for time-dependent crack growth. Our procedure is similar to that of Griffith in its use of a global energy balance. The Griffith method is generalized by the inclusion of the rate-of-energy dissipation term in the balance law. This rate-of-dissipation term is derived to represent the behavior of viscoelastic materials; thus the final results are applicable primarily to polymeric behavior. Our final results are concise analytical expressions [Eqns. (50)] for crack velocity as a function of the creep properties of the material, the level of loading, and the energy or work content of the crack-generated new surface. These analytical solutions are quite general; the primary restriction occurs because they are derived under asymptotic conditions of high- and low-crack velocities. Finally, we compare the analytical predictions with experimental results for a polyurethane elastomer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115904
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A special theory of viscoelastic fluids for application to suspensions (1973)
    Springer
    Acta mechanica 16 (1973), S. 183-198 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Diese theorie wird zur Beschreibung des Verhaltens einer schwachen Suspension von deformierbaren inkompressiblen elastischen Kugeln in einer inkompressiblen Newtonschen Flüssigkeit hergeleitet. Es wird gezeigt, daß eine Vielzahl von viskoelastischen Erscheinungen bei diesem heterogenen Werkstoff auftreten. Es zeigt sich, daß die das makroskopische Verhalten der Suspension beschreibende isotherme Werkstoffgleichung vom Typ der inkompressiblen viskoelastischen Flüssigkeit zweiter Ordnung ist, wobei die Relaxationsfunktion durch einen, den Koeffizienten der inneren Reibung der Trägerflüssigkeit, den Schubmodul, und die Volumskonzentration der elastischen Anteile enthaltenden analytischen Ausdruck gegeben ist. Der Zusammenhang dieser Arbeit mit ähnlichen Untersuchungen wird diskutier und die durch diese Theorie beschriebenen Erscheinungen mit bei der Prüfung homogener Polymere beobachteten verglichen.
    Notes: Summary This theory is derived to model the behavior of a dilute suspension of deformable, incompressible elastic spheres within an incompressible Newtonian fluid. It is shown that a full range of viscoelastic effects are evidenced by this type of heterogeneous media. The (isothermal) constitutive relation which governs the macroscopic behavior of the fluid is found to be that of the Coleman-Noll second order theory of incompressible viscoelastic fluids with the related relaxation functions being specified through analytical expressions involving the coefficient, of viscosity of the carrier fluid, the shear modulus of the elastic inclusions and their volume concentration. The relationship of the present work to previous similar analyses is discussed. Also the relationship of the effects seen with the present special theory to some observed effects in the testing of homogeneous polymeric fluids is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179989
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transverse tensile characteristics of fiber composites with flexible resins: Theory and test results (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 506-511 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A theoretical and experimental investigation has been conducted of the transverse tensile properties of flexible-resin/ glass-fiber composite lamina. The objective is to increase the elongation at failure of a lamina in a state of transverse tension so that when a lamina is used in a laminate configuration, it does not suffer premature failure (e.g., failure at a lower strain level than that for a lamina in fiber direction tension). We show that the mode of failure in the transverse tensile lamina differs greatly from that in the neat resin. The failure mode in the lamina form is found to be brittle fracture. From this, it follows that the controlling neat resin property is the low elongation modulus rather than the elongation at failure. Significant improvements in the transverse tensile strain at failure were obtained for the flexible-resin/glass-fiber systems studied.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760190708
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    Paper (German National Licenses)
    Fulltext
  • 5
    facet.materialart.
    Unknown
    A special theory of viscoelastic fluids for application to suspensions (1973)
    Springer
    Details
    Publication Date: 1973-09-01
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    A rate-dependent criterion for crack growth (1979)
    Springer
    Details
    Publication Date: 1979-02-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    A high order theory for uniform and laminated plates (1976)
    In:  CASI
    Details
    Publication Date: 2006-08-09
    Description: A theory of plate deformation is derived which accounts for the effects of transverse shear deformation, transverse normal strain, and a nonlinear distribution of the in-plane displacements with respect to the thickness coordinate. The theory is compared with lower order plate theories through application to a particular problem involving a plate acted upon by a sinusoidal surface pressure. Comparison is also made with exact elasticity solution of this problem. It is found that when the ratio of the characteristic length of the load pattern to the plate thickness is of the order of unity, lower order theories are inadequate and the present high order theory is required to give meaningful results. Results are given for the bending of symmetric cross-ply and angle-ply laminates. Comparison with exact elasticity solutions indicates that the present plate theory is sufficiently accurate for predicting the behavior of thick laminates.
    Keywords: COMPOSITE MATERIALS
    Type: NASA. Langley Res. Center Advan. in Eng. Sci., Vol 1; p 157-166
    Format: text
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    NASA TECHNICAL REPORTS
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