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  • 1990-1994  (4)
  • 1990  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Variational bounds on the eigenangle ω of transversely isotropic materials (1990)
    Springer
    Acta mechanica 85 (1990), S. 13-26 
    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
    Notes: Summary It is shown that the necessary parameters for an invariant description of the elastic behaviour of a transversely isotropic medium in terms of the spectral decomposition of its compliance tensor are the four eigenvalues of it and a dimensionless parameter, appropriately defined, the eigenangle ω. A study of the variational bounds imposed by thermodynamic restrictions on the values of the eigenangle ω is presented. It is further proposed that the eigenangle ω can be successfully used as a single parameter characterizing qualitatively both elasticity and toughness of transversely isotropic media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01213539
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cracks and slits in compression and shear: an experimental study (1990)
    Springer
    Acta mechanica 85 (1990), S. 55-70 
    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
    Notes: Summary The behavior of the two main types of flows encountered in materials such as rocks, i.e., cracks and slits, under compressive and shear stresses has been examined. It was shown that the existence of a gap between the edges of a slit is allowing the inward movement, causing the development of a negativeK I -SIF at its cornered extremities. On the other hand, for a slant ideal crack additional compressive stresses should develop because of the noncongruent deformation of its lips thus opposing the incompatible interpenetration of the crack flanks and causing an openingK I -SIF. Finally, for an ideal crack normal to the global stresses in the plate the cracked body behaves as a continuum without any singularity. In order to verify the validity of the above arguments the method of caustics has been used. After developing the appropriate equations of the caustics a series of experiments were executed giving results which support the already developed theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01213542
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The exact shear modulus of particulates based on the concept of mesophase (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 1118-1130 
    Details
    ISSN: 1435-1536
    Keywords: Particulatecomposites ; Kernermodel ; Christensenfield ; mesophase
    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 An accurate relationship for the shear modulus of particulates is derived based on the Kerner model, but not using its approximate relations. Furthermore, the model takes into account the existence of the mesophase layer between the inclusions and the matrix, which acts as a smooth transition boundary layer between constituent materials. By applying Christensen's field to the Kerner model, modified by introducing the mesophase, the new model is liberated from any inconsistencies. Experimental evidence and application to a glass particle-epoxy resin-matrix composite indicated the superiority of the model over previous ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410677
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Diffusion-based adhesive bonds between phases in fibrous composites (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 414-425 
    Details
    ISSN: 1435-1536
    Keywords: mesophase ; fibrouscomposites ; diffuseboundary ; polymer-polymer adjacent phases ; diffusion reaction
    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 In this paper the mesophase developed between main phases in fibrous composites was studied assuming that it constitutes a diffuse boundary. This type of mesophase is normally developed in polymer-polymer adjacent phases and it it useful for the study of modern composites disposing a coupling agent between main phases. At the high temperature of reaction of phases during the casting process both neighboring phases are partly liquified, allowing a two-way movement of elements of either phase whose intensity and extent depends on the particular diffusion characteristics of either phase and the affinities between them. The characteristics of this diffusion reaction were studied and their influence on the development and the properties of the adhesion between phases were established, especially for fiber composites. Interesting results were derived concerning the extent of the diffusive mesophase and its mechanical properties, as well as its contribution on the global mechanical behavior of the composite. Finally, the results were found to be in agreement with previously established models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411000
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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