Festigkeit Und Steifigkeit Von Papierwaben Bei Druck- Und Schubbeanspruchung
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1.1 Schalenbauweisen Im Leichtbau werden häufig mit Vorteil Schalenbauweisen angewandt, d.h. die Kräfte werden nicht in kompakten Bauelementen konzentriert, sondern weitgehend über gro flächige Werkstoffpartieen verteilt, die nahe der Au enkontur des Bauteiles gelegen sind oder diese selbst bilden. Die Steigerung der Werkstoff-Festigkeiten ermöglicht sehr dünnwandige Scha- lenkonstruktionen, soweit es durch besonders konstruktive Ma nahmen ge- lingt, die neben Zugspannungen fast in allen Bauteilen in der Ebene der Schalenhaut auftretenden Druck- und Schubspannungen zu beherrschen. Entscheidenden Einflu auf die übertragbare Druckspannung in einer Scha- le (Schub kann als eine zusammengesetzte Beanspruchung gleich gro er, senkrecht zueinander wirkender Druck- und Zugspannungen betrachtet wer- den) hat die Biegesteifigkeit der Schalenhaut. Diese wurde in manchen Konstruktionen durch Vernieten, Verschwei en, Verlöten oder Verkleben von Versteifungsprofilen mit der Schalenhaut erhöht; jedoch lagen die bei Ersch8pfung der Tragfähigkeit solcher Konstruktionen erreichten mittleren Druckspannungen in den meisten Fällen weit unter der Druck- festigkeit oder der Flie grenze des Werkstoffes. Neuerdings verwendet man statt Versteifungsprofilen vorteilhaft kon- tinuierliche Stützungen durch Wabenstoffe oder poröse Leichtstoffe und erreicht damit höchste Ausnutzung des tragenden Werkstoffes. Bei gün- stiger Werkstoffkombination und sorgfältiger Dimensionierung sowie ei- ner Gestaltung der Bauteile, die alle speziellen Eigenschaften der Werk- stoffe berücksichtigt, kann die Druckfestigkeit oder Flie grenze des tragenden Schalenwerkstoffes erreicht werden, ohne da vorher Beulung eint itt. Diese Formhaltigkeit auch unter Belastung ist häufig ein we- sentlicher Gesichtspunkt bei car Wahl einer Bauweise, insbesondere im Flugzeugbau, wo die Forderungen nach aerodynamisch hochwertiger Uber- fläche und Profiltreue ständig weiter verschärft worden sind.
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