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  • 1
    Electronic Resource
    Electronic Resource
    Durch veränderliche Betriebslasten in Kerben erzeugte Eigenspannungen und ihre Bedeutung für die Anwendbarkeit der linearen Schadensakkumulations-HypotheseBericht aus dem Laboratorium für Betriebsfestigkeit (LBF), Gemeinnütziges Forschungsinstitut der Fraunhofer-Gesellschaft, dem die Autoren angehören (1975)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 194-205 
    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
    Description / Table of Contents: Residual Stresses Due to Variable Service Loads and Their Importance Regarding the Applicability of the Linear Damage Accumulation Hypothesis.The linear damage accumulation hypothesis often provides unreliable life estimations. To improve its application, residual stresses at the notch root of open hole specimens (Kt = 2,5) of the aluminium alloys AlCuMg 2 (US equivalent 2024 T 3) and AlZnMgCuAg (US equivalent 7075 T 6) were continuously measured during the macro-crack-free life range. Based on the residual stress history a corrected hypothesis was applied.
    Notes: Die lineare Schadensakkumulations-Hypothese liefert häufig sehr ungenaue Schätzwerte der Lebensdauer. Um zu einer Klärung beizutragen, wurden an gelochten Stäben, Formzahl ak = 2,5, aus den Leichtmetallegierungen AlCuMg 2 und AlZnMgCuAg im Kerbgrund während des ersten von Makrorissen freien Lebensdauerabschnittes die Eigenspannungen gemessen und darauf aufbauend eine bezüglich der Eigenspannungen korrigierte Hypothese angewendet.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19750060604
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  • 2
    Electronic Resource
    Electronic Resource
    Bedeutung der Unregelmäßigkeit Gauß'scher Zufallsfolgen für die BetriebsfestigkeitÜberarbeitete Fassung der FB-124 (1976) (32) (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 246-256 
    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
    Description / Table of Contents: Significance of Irregularity of Gaussian Random Sequences on Random FatigueThe results of investigations concerning the influence of the irregularity factor which are found in the literature are often contradicting. The cause may be, that with the variation of the irregularity factor in some cases other influencing parameters were unintentionally varied too. To help clarify the situation a test program was conducted. Notched specimen and single shear lap joints of the aluminium alloy 2024 were tested under axial random loading sequences to determine the influence of irregularity on fatigue life. The irregularity factors (l = 0,99, 0,7, 0,3) cover the range interesting in practice. The method to generate random sequences ensures that the factor of irregularity is the only variate among the usual parameters of the random sequence.
    Notes: Die zum Teil widersprüchlichen Angaben im Schrifttum über den Einfluß des Unregelmäßigkeitsfaktors sind vermutlich darauf zurückzuführen, daß bei einschlägigen Untersuchungen neben dem Unregelmäßigkeitsfaktor auch noch andere Parameter unbeabsichtigt variiert wurden. Um zu einer Klärung beizutragen, wurden unter Zufallsfolgen von Axiallasten mit Merkmalen eines stationären Gaußprozesses Betriebsfestigkeits- Versuche an einem Kerbstab und an einer einschnittigen Fügung aus der Legierung AlCuMg2 durchgeführt und der Einfluß der Unregelmäßigkeit auf die Lebensdauer bestimmt. Die untersuchten Unregelmäßigkeitsfaktoren überdecken mit l = 0,99,0,7 und 0,3 den für die Betriebsfestigkeit interessanten Anwendungsbereich. Das gewählte Verfahren zur Generierung der Zufallsfolgen gewährleistet, daß der Unregelmäßigkeitsfaktor die einzige Variable unter den üblichen Parametern der Zufallsfolge bleibt.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090706
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  • 3
    Electronic Resource
    Electronic Resource
    Some properties of poly(3-hydroxybutyrate)-poly(3-hydroxyvalerate) blends (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 39 (1996), S. 215-219 
    Details
    ISSN: 0959-8103
    Keywords: poly-3-hydroxybutyrate (PHB) ; poly-3-hydroxyvalerate (PHV) ; biodegradable polymers ; polymer blends ; Chemistry ; Polymer and Materials Science
    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: The melting, crystallization and dynamic mechanical behaviour of blends of bacterially produced poly[D(-)-3-hydroxybutyrate] (PHB) and poly[D(-)-3-hydroxyvalerate] (PHV) have been investigated. Results showed that melt-pressed PHB-PHV blends contained phase-separated domains in the melt which subsequently crystallized as PHB and PHV type spherulites respectively. The two melting regions detected by DTA related to separate melting of PHB and PHV crystallites, which were almost unaffected by the blend composition. The mechanical behaviour of a random copolymer of PHB/HV was compared with that of a blend of almost the same composition, and found to be markedly different.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of Isoxazolo[60]fullerenes with Dumb-Bell-Type Structure and Atropisomeric Properties (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 2087 
    Details
    ISSN: 1434-193X
    Keywords: Fullerenes ; Cubanes ; Atropisomerism ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New dumb-bell-type fullerene adducts 2, 4, and 8a-b could be synthesized via bifunctional nitrile oxides. The [60]fullerene derivative 16 of this type was synthesized by twofold esterification with an isoxazolo[60]fullerenecarboxylic acid derivative. In the latter case the reaction was used to link the archimedic polyhedron fullerene with the platonic element cubane. When a bulky spacer between the fullerene units was used, atropisomeres 8a-b occurred. The fullerene derivative 11 with an anthracene moiety exhibited axial chirality.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Reaktionen der D-Glucuronsäure, X. Eliminierungen an D-Glucofuranurono-6,3-lacton und seinen DerivatenHerrn Prof. Dr. L. Horner zum 65. Geburtstag gewidmet. (1977)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 169-176 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of D-Glucuronic Acid, X.  -  Elimination Reactions of D-Glucofuranurono-6,3-lactone and its DerivativesIn the presence of bases D-glucofuranurono-6,3-lactone, its glycosides, and their 2,5-di-O-alkyl derivatives, respectively, form doubly unsaturated products. This reaction is initiated by proton abstraction at C-5 causing β-elimination with opening of the tetrahydrofuran ring and liberation of the aldehyde function. In a subsequent second elimination (2E, 4Z)-2,5-dihydroxy-and (2E, 4Z)-2,5-dialkoxy-6-oxo-2,4-hexadienoic acid, respectively, are formed, of which the former spontaneously isomerizes to the thermodynamically more stable (2Z, 4Z)-conformer.
    Notes: D-Glucofuranurono-6,3-lacton, seine Glykoside und deren 2,5-Di-O-alkylderivate reagieren mit Basen unter Bildung doppelt ungesättigter Produkte. Diese Reaktion wird durch Protonabstraktion an C-5 eingeleitet, wobei der Tetrahydrofuranring durch β-Eliminierung geöffnet und die Aldehydgruppe in Freiheit gesetzt wird. In der daran anschließenden Aldoleliminierung bilden sich (2E, 4Z)-2,5-Dihydroxy-oder (2E, 4Z)-2,5-Dialkoxy-6-oxo-2,4-hexadiensäure, von denen die erstere spontan zum thermodynamisch stabileren (2Z, 4Z)-Konformeren isomeriiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197719770117
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Desmotropie o- und p-chinoider Salze in der Thiazinreihe (1913)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 46 (1913), S. 2310-2327 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.191304602162
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  • 7
    Electronic Resource
    Electronic Resource
    Über die chinoiden Salze der Thiazin-Reihe (II. Mitt.) (1914)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 47 (1914), S. 1494-1507 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19140470225
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