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  • Electronic Resource  (7)
  • 1980-1984  (6)
  • 1930-1934  (1)
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  • Electronic Resource  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Catalytic Partial Oxidation of Alcohols in the Vapor Phase.IV (1932)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 24 (1932), S. 924-926 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50272a022
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tensile fracture of centre-notched angle ply (0/±45/0)S and (0/90)2S graphite — epoxy composites (1982)
    Springer
    Journal of materials science 17 (1982), S. 417-428 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The fracture behaviour of centre-notched (0/± 45/0)S and (0/90)2S laminates with increasing notch length has been studied. Two test series have been investigated: specimens of constant width (W=20 mm) and small notch length (2a ⩽ 12 mm), and specimens with various notch lengths (5 ⩽ 2a ⩽ 35 mm) and a constant relative notch length (2a/W=0.5). An X-ray technique showed that the damage at the notch tip, which is formed at increasing load, consists mainly of subcracks parallel to the fibres of the constituent layers. The damage zone causes the crack opening displacement (COD) to deviate from the original linearity. TheK R curve concept has been applied assuming that the COD deviation from linearity is completely the result of original crack extension. This approach fails to describe the notch length effect, because a tangent point between theK R andK curves was not found and because of a strong dependency of the maximum fracture resistanceK Rmax on notch length. The fracture behaviour of 20 mm wide specimens could be explained with the point and average stress criteria, based on characteristic lengths which are independent of notch length. At various notch lengths at a constant 2a/W=0.5, however, the characteristic lengths increased with increasing notch length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00591477
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Probabilistic initial failure strength of hybrid and non-hybrid laminates (1984)
    Springer
    Journal of materials science 19 (1984), S. 3546-3553 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper deals with the initial failure of unidirectional hybrid laminates and [±θ/90]s non-hybrid laminates. The initial failure strength or strain at the failure of low elongation layers is analysed by the statistical approach based upon the weakest link model. First ply failure is adopted as a criterion for the initial failure of the laminate. An expression for determining the first ply failure strength has been derived and this expression can be reduced to a volumetric relation as a special case. It is also shown that the initial failure strength or strain is greater in composites composed of low elongation and high elongation materials than in the pure low elongation composite. This is the result of the “size effect”, that is the failure probability is lower in the composite with the smaller size of low elongation material. A good agreement between the theoretical and experimental results is achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552267
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Probabilistic initial failure strength of hybrid and non-hybrid laminates (1984)
    Springer
    Journal of materials science 19 (1984), S. 3546-3553 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper deals with the initial failure of unidirectional hybrid laminates and [±θ/90]s non-hybrid laminates. The initial failure strength or strain at the failure of low elongation layers is analysed by the statistical approach based upon the weakest link model. First ply failure is adopted as a criterion for the initial failure of the laminate. An expression for determining the first ply failure strength has been derived and this expression can be reduced to a volumetric relation as a special case. It is also shown that the initial failure strength or strain is greater in composites composed of low elongation and high elongation materials than in the pure low elongation composite. This is the result of the “size effect”, that is the failure probability is lower in the composite with the smaller size of low elongation material. A good agreement between the theoretical and experimental results is achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396927
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of notch length, specimen thickness, ply thickness and type of defect on the fracture behaviour of angle-ply graphite-epoxy composites (1982)
    Springer
    Journal of materials science 17 (1982), S. 2324-2336 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental study was carried out on the effects of notch length, specimen thickness, ply thickness and type of defect (centre-notch or hole) on the fracture toughness of graphite-epoxy composites with lay-up sequences of 0/±45°/0 and 0/90°. Three fracture-mechanical concepts were applied: the Waddoups-Eisenmann-Kaminski (WEK) model, the Whitney-Nuismer model (point and average stress cirteria) and the K R-curve method. An increase of notch length as well as an increase of ply thickness led to a higher toughness, whereas a change in specimen thickness did not noticeably affect the toughness. Furthermore, the hole caused a smaller strength reduction than a notch. The applicability of the above-mentioned concepts is probably restricted mainly because of the fact that they do not, or do only insufficiently, regard the damage zone near the border of the defect, if a large damage zone usually leads to larger material parameters of the investigated concepts, namely the inherent flaw size, the characteristic lengths of the point and average stress criterions and the K R -value at fracture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543741
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    DFVLR-Werkstoff-Kolloquium. - Verbundwerkstoffe -. Kurzfassungen der Veranstaltung vom 3. 12. 1980 in Porz/Wahn. Bruchmechanik an Faserverbundwerkstoffen am Beispiel von B/AL und CFK (1981)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 104-105 
    Details
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19810120307
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Evidence for a direct role of α-MSH in morphological background adaptation of the skin in Sarotherodon mossambicus (1981)
    Springer
    Cell & tissue research 217 (1981), S. 361-372 
    Details
    ISSN: 1432-0878
    Keywords: Pars intermedia ; α-MSH ; Background ; Melanophore ; PAS positive cells ; MSH cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The skin colour of the cichlid teleost Sarotherodon mossambicus adapted rapidly to changes in background colour. The physiological adaptation was associated with morphological changes in the dermis. Differences in the dermis were found between fish adapted to a black or white background for 14 days. Number and size of the melanophores as well as the amount of pigment in the cytoplasm of the melanophores were significantly increased in fish adapted to a black background. Changes in the dermis parallelled changes in the state of activity of the two endocrine cell types in the pars intermedia of the pituitary. Both the PAS positive cells and the MSH producing cells were more active when the fish were exposed to a black rather than a white background. Fish continuously infused with α-MSH, using an osmotic minipump, had more melanophore cytoplasm and pigment per dermis surface unit area than untreated fish. The activity of the MSH cells in MSH-infused fish exposed to a black background was reduced to a level comparable to the MSH cell activity of untreated fish on a white background. α-MSH treated fish that were exposed to a white background had many disintegrating MSH cells. These findings point to inactivation of these cells by exogenous α-MSH. The activity of the PAS positive cells was not influenced by treatment with α-MSH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233586
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    Paper (German National Licenses)
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