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  • 1992  (2)
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  • 1995-1999
  • 1990-1994  (2)
  • 1980-1984
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 62 (1992), S. 474-486 
    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: Übersicht Es wird eine Biegetheorie dünner Schalen bei finiten Deformationen sowie die zugehörige Finite-Element-Formulierung vorgestellt. Die kinematischen Annahmen sind vom Reissner-Mindlin-Typ. Die Darstellung basiert auf der Einführung eines gemischten Funktionals mit unabhängigen Drehfreiheitsgraden in der Schalenmmittelfläche und einem schiefsymmetrischen Anteil der Membrankräfte. Die resultierenden Euler-Lagrange-Gleichungen ergeben das Gleichgewicht und die Symmetrie der Schnittgrößen. Weiterhin ergibt sich die Gleichheit des unabhängigen mit dem verschiebungsabhängigen Rotationsfeld. Die Entwicklung des Vier-Knoten-Schalenelementes enthält somit auch den Drehfreiheitsgrad um die Schalenormale. Für das Verschiebungsfeld wird ein Allman-Ansatz gewählt.
    Notes: Summary A bending theory for thin shells undergoing finite deformations is presented, and its associated finite element model is described. The kinematic assumptions are of Reissner-Mindlin type. The formulation is based on the introduction of a mixed functional with independent in-plane rotation field and skew-symmetric part of membrane forces. The resulting Euler-Lagrangian equations yield the equilibrium of stress resultants and the couple resultant with respect to the surface normal. Furthermore, the equality of the independent rotation field with the displacement dependent rotation field is enforced. Hence, the symmetry of the stress resultants is fulfilled in a weak sence. Naturally, the development of a quadrilateral finite element includes drilling degrees of freedom. The displacement field is approximated using an Allman-type interpolation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 435-438 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Hydrogen and hydrogen-containing species (H2O, OH etc.) play a dominant role in the various properties of glass surfaces and technical oxidic thin films deposited on glass. The amount of hydrogen and its distribution with depth are influenced by preparation and production processes, film materials, density and voids, etc. The 15N nuclear reaction technique, which works quantitatively and non-destructively, was used to investigate glass surfaces and thin films of TiO2, Ta2O5 and SiO2 produced by sol-gel processes, reactive evaporation, sputtering and ion plating on glass substrates. An increase or decrease in hydrogen content influences optical and mechanical properties such as the refractive index and adhesion of the films.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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