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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 25 (1994), S. 3-10 
    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: Transferability - a fundamental problem for fatigue life predictionFrequently specimen fatigue data have to be applied for fatigue life assessment of components and structures. It has to be assured that such data are relevant for the component under consideration. Equally it has to be assured that constant amplitude S-N data can be used for fatigue assessment in the case of spectrum loading. It is shown that application of transfer functions which are often of empirical nature requires an understanding of basic principles of material and component behaviour. Life prediction concepts should acknowledge the existence and relative portion of the crack initiation and crack propagation phases which are dominated by different mechanisms.
    Notes: Die Übertragbarkeit von Probestabschwingfestigkeitskennwerten auf Bauteile stellt eine wesentliche Voraussetzung für die Lebensdauervorhersage dar. Dies betrifft ebenso die Übertragung von Kennwerten für einstufige Schwingbelastung auf regellose Belastungsfälle im Rahmen der Schadensakkumulationsrechnung. Es wird aufgezeigt, daß bei der Anwendung der häufig empirisch gewonnenen Übertragungskennwerte und -funktionen die werkstoffmechanischen Grundlagen und Einschränkungen beachtet werden müssen, um Fehlschlüsse zu vermeiden. Insbesondere sollten Anriß- und Rißfortschrittsphase getrennt betrachtet werden, da hier unterschiedliche und teilweise gegenläufige Mechanismen dominieren.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-08-28
    Description: Four different combustion efficiencies commonly used for assessing ramjet engines are compared. The mixture ratios cover a range from stoichiometric to an equivalence ratio of 0.2, and the polyethylene/air propellant system is used. The ratio of effective to ideal temperature rise is taken as reference efficiency. As might be expected, major differences can be observed near stoichiometric and down to equilvalence ratios of 0.5. These are quantitatively demonstrated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-77749 , NAS 1.15:77749
    Format: application/pdf
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