This paper investigates the load-carrying capacity and failure mode of carbon fiber/epoxy resin T700/QY9611 composite T-joint with initial debonding damage under tensile load. The numerical results were verified by experiments. Based on the verified finite-element model, the effects of the length and location of initial debonding damage on the properties of the T-joint were further studied. It was found that the carrying capacity is closely related to the failure mode. If the initial debonding damage length is in the range of 0–5 mm, crack propagation does not involve the filling area, which is a tensile failure with a high failure load of about 20 kN. For the specimens with damage length greater than 5 mm, the shear stress causes obvious damage within the filling area, and the crack extends to the soleplate/L-rib interface, which is a mixed failure of tension and shear and the failure load decreases by 47.5%, to only around 11 kN. However, the load-carrying capacity of the T-joint is less affected by different debonding damage lengths under the same failure mode. The research results have important reference values for damage assessment and repair tolerance of composite T-joints.
Sensitivity Study of Debonding Damage to Load-Carrying Capacity of Composite T-Joints under Tensile Loading
J. Aerosp. Eng.
Journal of Aerospace Engineering ; 36 , 4
2023-07-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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