Fatigue Crack Propagation in Pressurized metallic Fuselages

Molinari, Gianluca (2013) Fatigue Crack Propagation in Pressurized metallic Fuselages, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Meccanica e scienze avanzate dell'ingegneria: progetto n. 1 "Disegno e metodi dell’ingegneria industriale e scienze aerospaziali", 25 Ciclo. DOI 10.6092/unibo/amsdottorato/5849.
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On the basis of well-known literature, an analytical tool named LEAF (Linear Elastic Analysis of Fracture) was developed to predict the Damage Tolerance (DT) proprieties of aeronautical stiffened panels. The tool is based on the linear elastic fracture mechanics and the displacement compatibility method. By means of LEAF, an extensive parametric analysis of stiffened panels, representative of typical aeronautical constructions, was performed to provide meaningful design guidelines. The effects of riveted, integral and adhesively bonded stringers on the fatigue crack propagation performances of stiffened panels were investigated, as well as the crack retarder contribution using metallic straps (named doublers) bonded in the middle of the stringers bays. The effect of both perfectly bonded and partially debonded doublers was investigated as well. Adhesively bonded stiffeners showed the best DT properties in comparison with riveted and integral ones. A great reduction of the skin crack growth propagation rate can be achieved with the adoption of additional doublers bonded between the stringers.

Tipologia del documento
Tesi di dottorato
Molinari, Gianluca
Dottorato di ricerca
Scuola di dottorato
Ingegneria industriale
Settore disciplinare
Settore concorsuale
Parole chiave
Fatigue and Damage Tolerance, Metallic Fuselages, Analytical Methods
Data di discussione
3 Maggio 2013

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