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  • 1
    Publication Date: 2018-04-30
    Keywords: ddc:330
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: German
    Type: report , doc-type:report
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 39 (1996), S. 215-219 
    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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  • 3
    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
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 246-256 
    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
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