Some commercial aircraft that entered service in 1970s or 1980s are expected to reach their design service life soon. However, because researchers are constantly improving the accuracy of structural analysis and failure prediction, the maximum allowable flight loads of those aircraft can be recalculated to utilize the full potential of their structures. Motivated by this goal, the tradeoffs of allowable flight loads and safety of aerospace structures via deterministic and probabilistic design methodologies are analyzed. The methodologies are illustrated by performing allowable flight load calculation of a sandwich panel used in aerospace structures. The effect of using a more accurate prediction technique for interfacial fracture toughness that combines interfacial fracture toughness with mode mixity instead of using the traditional model that disregards mode mixity is explored. It was found that by utilizing this more accurate model with the change in B-basis properties, the deterministic approach allows a 13.1% increase in the allowable flight load and a reduction of probability of failure by a factor of five. The probabilistic approach allows a 26.5% increase in allowable flight load, while maintaining the original probability of failure.
Increasing allowable flight loads by improved structural modeling
Berechnung höherer zulässiger Fluglasten mit probabilistischen Strukturmodellen
AIAA Journal (online) ; 44 , 2 ; 376-381
2006
6 Seiten, 5 Bilder, 6 Tabellen, 16 Quellen
Aufsatz (Zeitschrift)
Englisch
Ausfallwahrscheinlichkeit , Bruchenergie , Bruchzähigkeit , Festigkeitsberechnung , Flug , Grenzbelastung , Grenzschichtablösung , Innenriss , Last (mechanisch) , Mehrlagenlaminat , Raumflugzeug , Strukturmodell , Tragwerk (Flugzeug) , Verbundplatte , Verfahrensvergleich , Versagensart , Wahrscheinlichkeitsrechnung , zusammengesetzte Beanspruchung
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