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  • Articles  (5)
  • 1985-1989  (5)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (5)
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  • Books
  • Articles  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 17 (1986), S. 406-413 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Possibilities and Consequences of Lightweight Design - Examples of the Operating Strength of Frontaxles-, Steering Systems- and Drive ComponentsThe aim of extensive weight reductions in car construction leads on the one hand to the increasingly exploiting use of traditional materials, and on the other to the use of lighter materials. This trend can be detected in body and trim features, but also in running gear, steering systems and drive components. When choosing alternative materials it should be borne in mind that alongside the often many-sided aspects of function and reliability, economy frequently has a decisive influence.In this paper the dynamic and static test rig results from parts made of different materials are described and compared: control arm, steering shaft, conrod and prop shaft.
    Notes: Das Streben nach weitgehendem Leichtbau führt im Automobilbau neben dem immer gezielteren Einsatz der klassischen Materialien zunehmend zur Verwendung von leichteren Werkstoffen. Nicht nur bei Karosserie- und Ausstattungsbauteilen, sondern auch bei Fahrwerks-, Lenksystem- und Antriebsbauteilen ist dieser Trend festzustellen. Bei der Auswahl alternativer Werkstoffe ist zu berücksichtigen, daß die Wirtschaftlichkeit neben den oft vielfältigen Funktionsgesichtspunkten und der Zuverlässigkeit einen entscheidenden Einfluß hat.In diesem Beitrag werden die dynamischen und statischen Prüfstandsergebnisse, die mit Bauteilen aus verschiedenen Materialien erzielt wurden, dargestellt und miteinander verglichen.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 264 (1986), S. 1010-1016 
    ISSN: 1435-1536
    Keywords: Oriented polymers ; elastic anisotropy ; aggregate model ; orientation parameters
    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 A reinvestigation of the single phase aggregate model (SPAM) of Ward applied to the elastic properties of uniaxially oriented polymers is presented. It is shown that the Voigt and the Reuss orientation average of elastic constants can be represented as a linear transformation in a 5-dimensional vector space. The corresponding transformation matrix can be diagonalized, showing that the eigenvalues of this transformation are the orientation parametersP 0 =1,P 2 andP 4 . Taking advantage of this representation an easy test of applicability of the SPAM is proposed. Possibilities to evaluate the SPAM parameters are reviewed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-1536
    Keywords: High performance Brillouin spectroscopy ; elastic tensor ; birefringence ; scattering geometries ; D-function
    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 General aspects of high performance Brillouin spectroscopy in polymers using special scattering geometries such as 90A-scattenng geometry are discussed. Technical improvements are reported resulting in absolute accuracies up to 0.05 % for sound velocity determination. A method of data analysis is presented delivering simultaneously the complete set of elastic stiffness constants. The influence of birefringence on the Brillouin line shifts in anisotropic polymeric systems is estimated and techniques to reduce this influence are proposed. The determination of the principal refractive indices by Brillouin spectroscopy is discussed. Furthermore, a quantityD X , which is sensitive to hypersonic relaxation processes, is introduced.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1435-1536
    Keywords: Polycarbonate ; oriented polymers ; elastic and optical anisotropy ; Brillouin spectroscopy ; aggregate model ; orientation parameters
    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 High resolution Brillouin spectroscopy (BS) has been used to investigate elastic and optical properties of uniaxially drawn samples of polycarbonate (PC). The results are discussed in the framework of the single phase aggregate model (SPAM) of Ward. According to a recently developed evaluation technique, the SPAM parameters of PC are determined, resulting in the following elastic constants of the structural units:c 33 0 =33 GPa,c 11 0 =7 GPa,c 13 0 =9.7 GPa,c 44 0 =1.4 GPa, andc 66 0 =1 GPa. A nearly quadratic dependence of the orientation parameterP 4 onP 3 results, which can be explained by a modified pseudoaffine deformation scheme.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 266 (1988), S. 692-700 
    ISSN: 1435-1536
    Keywords: PMMA ; orientation ; fourth moment ; sound velocity ; Brillouin scattering
    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 Uniaxially stretched samples of PMMA were investigated by Brillouin Spectroscopy (BS). From the velocity of hypersound we could determine most of the elastic constants. Using a recently developed analysis [1] it is demonstrated that the properties of this polymer can be well described by the aggregate model. This result offers the possibility of mapping the mechanical properties by birefringence measurements. The dependence of the fourth momentP 4 on the second momentP 2 is identical with that determined for PC [2] and follows, in the measured range, that of an affine orientational state. Nevertheless, the dependence on the stretching ratio differs for different molecular weights. Thus the partition of the deformation into an orientational and an elongational contribution, as has been proposed [3], seems to be well founded. The partition depends on the stretching conditions.
    Type of Medium: Electronic Resource
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