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Auswirkungen des lokalen Beulversagens von Wabenkernen auf das globale Festigkeitsversagen von Sandwich-Biegeproben

Auswirkungen des lokalen Beulversagens von Wabenkernen auf das globale Festigkeitsversagen von Sandwich-Biegeproben

          
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About the Book

Studienarbeit aus dem Jahr 2003 im Fachbereich Ingenieurwissenschaften - Luft- und Raumfahrttechnik, Note: 1,3, Technische Universität Berlin (Institut für Luft- und Raumfahrttechnik), Sprache: Deutsch, Abstract: Diese Arbeit untersucht, inwieweit bei einem ebenen Sandwichtragwerk lokales Stabilitätsversagen des Kerns für das Festigkeitsversagen der Struktur mitverantwortlich gemacht werden kann. Zunächst wird der Vierpunkt-Biegeversuch analytisch nachgerechnet und die Testdaten werden mit dem Ergebnis verglichen sowie die einzelnen Wandsegmente des Hexagonalkerns als Stege eines Biegeträgers betrachtet und als solche einer Beulanalyse unterzogen. Die beulkritische Last wird mit Hilfe einer kombinierten Beulhypothese aus Druckkomponente und Schubkomponente bestimmt. Für eine Untersuchung des globalen Deformationsverhaltens des Sandwichverbundes liefert die Sandwich-Membrantheorie gute Ergebnisse. Diese Theorie kann jedoch nur so lange angewandt werden, so lange sich der Sandwich nahezu ideal, gemäß den Voraussetzungen der Sandwich-Membrantheorie, verhält. Werden größere Lasten punktuell eingeleitet, kann es allerdings sein, dass diese Voraussetzungen nicht mehr erfüllt werden. Es muss untersucht werden, ob der Kern diese Lasten aushält. Die Kernanalyse zeigt, dass die Stabilität des Kerns sehr stark von der Dicke der Wabenwände abhängt. Durch Verstärkung der Stege kann eine ausreichende Stabilität gewährleistet werden. Durch stärkere Wabenwände erhöht sich aber auch das Gewicht des Kerns. Um das Gewicht gleich zu halten oder zu senken, muss der Wabendurchmesser erhöht werden. Die Begrenzung hierfür ist die ausreichende Schubfestigkeit der Klebeverbindung zwischen dem Kern und den Deckhäuten, da sich durch die Vergrößerung der Waben die Länge der Klebekanten erhöht. Durch die Kernoptimierung kann wegen der Verbesserung der Kernstabilität nur eine Gewichtsreduzierung des Kerns von 2,9 % erreicht werden, was den Gewichtszuwachs durch den höheren Kern nicht ausgleicht


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Product Details
  • ISBN-13: 9783656880288
  • Publisher: Grin Verlag Gmbh
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 4 mm
  • Width: 148 mm
  • ISBN-10: 365688028X
  • Publisher Date: 21 Jan 2015
  • Height: 210 mm
  • No of Pages: 72
  • Series Title: German
  • Weight: 104 gr


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Auswirkungen des lokalen Beulversagens von Wabenkernen auf das globale Festigkeitsversagen von Sandwich-Biegeproben
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