For stiffened panel structures, improvement of the damage tolerance is still a major issue for component design. In general, a toughened resin system or three-dimensional textile fiber preform could provide some improvements. However, fiber stitching is found to be an easy and cost-effective method to enhance the properties of the composite in the thickness direction, as compared with conventional laminates. In several studies, through-the-thickness stitching of the fibrous preform was reported to improve damage tolerance and residual strength after impact of the composites. For fuselage and wing-box structures, the stiffener-to-skin separation is one of the major considerations of the panel failure as subjected to the internal pressure, either the cabin differential pressure or the wing-box fuel tank pressure. The stiffener and skin may be stitched in an efficient way to enhance the integrity of the panel. This study investigates the reinforcing effect of stiffener-to-skin stitching on flat blade-stiffened composite panels. T-shaped composite parts, which represented a unit of the blade-stiffened panel, with fiber stitching in the joint areas were fabricated. Several types of stitching configurations were tested to evaluate the influence of stitching. For stiffened panels, stitches on both the stiffener and the flange could increase the failure pull-off load by about 25 %. As the skin side on the stiffener is subjected to impact, fiber stitches on the stiffener and flange can effectively reduce the crack growth and retain about 70 % - 80 % of the original strength of stiffener-to-skin joint.
Experimental investigation on blade-stiffened panel with stiffener-to-skin fiber stitching
Experimentelle Untersuchung eines flossenversteiften Hautfelds, dessen Versteifungsflossen mit der Beplankung durch Nadeln verbunden sind
AIAA Journal ; 34 , 9 ; 1964-1966
1996
3 Seiten, 3 Bilder, 3 Tabellen, 5 Quellen
Article (Journal)
English
Platte (Bauteil) , verstärkter Kunststoff , Glasfaser , Bewehrungsmatte , Stoff (Textil) , Gießform , Spritzpressen , Auslegung (Dimension) , Vorformling , Kostenersparnis , Bruchfestigkeit , Stoß (Schlag) , Flugzeugrumpf , Tragflügel , Druckkraft , Innendruck , Vergleichsmessung , Position , Ausziehwiderstand , Ballistik , Geschwindigkeit , Flansch (Verbindungselement) , Rissausbreitung , Konfiguration , T-Träger , Harzinjektionsverfahren
Experimental Investigation on Blade-Stiffened Panel with Stiffener-to-Skin Fiber Stitching (TN)
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