Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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STRESS INTENSITY FACTOR CALIBRATION FOR A LONGITUDINAL CRACK IN A FUSELAGE BARREL

S.M.O. Tavares  P.M.S.T. de Castro       

Anales de la Mecánica de la Fractura, nº 27 . 2010 . Pág. -
Ver (.pdf): 130

Resumen: Aircraft structures require minimum weight configurations with high strength in order to support all operation stresses with high reliability. Framework construction is the base of these airframes where cross sectional shapes are bolted, welded, bonded, pinned, riveted or machined into a rigid assembly. The vertical and horizontal cross-members are arranged to withstand all structural loads and the skin to support the pressure gradient. This type of fuselage has been in use for about 80 years, it is very strong and of relatively light weight when used with high specific strength materials. Due to the impossibility of producing defect free structures and to avoid damages during all life cycle, these structures require to be damage tolerant in order to be trustworthy. Damage tolerance is a concept predominantly applied in the primary structural parts of civil airframes in order to tolerate a defect that can be detected and repaired in the next maintenance check. The two most frequently types of structural damages in a fuselage are the longitudinal cracks due the pressurization cycles and the circumferential cracks due the bending and torsion of the fuselage. In this article, the stress intensity factor, quantifying the intensity of the stress field around a crack tip for a longitudinal crack under the pressurization load, is studied. For this purpose, a barrel composed by two frames was chosen, with the longitudinal stiffeners and with the geometry usually found in civil airframes. A central crack, between the two frames, was simulated in a finite element model composed by solid elements. The stress intensity factor for different crack lengths, until the crack tips reach the frame were calculated using linear elastic fracture mechanics assumptions and the modified virtual crack closure technique. In addition, the stress intensity factors along the skin thickness were determined. The variation of the SIFs values along the thickness is non symmetric due the bulging effect, which it is illustrated in this article.

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Faculdade de Engenharia da Universidade do Porto and IDMEC-Porto Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
Faculdade de Engenharia da Universidade do Porto and IDMEC-Porto Rua Dr. Roberto Frias, 4200-465 Porto, Portugal





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