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Zum Einfluß der Belastungsreihenfolge auf die Lebensdauer von Kerbstäben aus Stahl und Aluminium

Prof. Svenson zum 80. Geburtstag gewidmet

About the effect of loading sequence on the fatigue life of notched specimens made from steel and aluminium alloys

: Buxbaum, O.; Klätschke, H.; Oppermann, H.

: Fraunhofer-Institut für Betriebsfestigkeit -LBF-, Darmstadt

	Darmstadt: Fraunhofer LBF, 1989, 47 pp. : Abb.,Tab.,Lit. Bericht - Fraunhofer-Institut für Betriebsfestigkeit, FB 186

	German
	Report
	Fraunhofer LBF ()
	aluminium; Belastungsreihenfolge; counting method; Durchmischung; estimation; fatigue life; gekerbte Probe; intermixture; Lebensdauerabschätzung; local stress strain approach; Nennspannungskonzept; nominal stress approach; notched specimen; örtliches Spannungsdehnungskonzept; sequence of loading; simulation; Stahl; steel; Zählverfahren; Reihenfolge; Markov Prozess; Werkstoffeigenschaft

Abstract
A statistical parameter which can be derived from the Markov matrix has been defined in order to characterize the intermixture of random loading fluctuations. By means of this intermixture parameter load sequences for fatigue tests can be generated closer to reality and thus more reliable as well as effects resulting from loading sequences can be taken into account quantitatively in life calculations. The intermixture parameter has been calculated for 17 test laod sequences. The corresponding fatigue test results obtained for notched specimens (K sub t 1.4 up to 3.6) made from steels or aluminium alloys either under bending or axial loading, led to a general relation between intermixture and fatigue life being primarily influenced by the stress ratio.

: http://publica.fraunhofer.de/documents/PX-46037.html