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Effects of longitudinal and hoop stiffeners on damage propagation in pressurized composite cylinders
An experimental study was conducted on the combined effects of longitudinal and hoop stiffening bands on the damage propagation in pressurized composite cylindrical shells. Damage was simulated as through-thickness longitudinal slits. Two different stiffener configurations were studied: 1) alternating continuous and broken hoop and longitudinal stiffeners (type A) and 2) continuous longitudinal and hoop fabric stiffeners (type B). In all but one cylinder, damage turned 90 deg near the edge of the hoop stiffening bands. In cases in which damage turned, it continued its propagation in the hoop direction, breaking the first set of longitudinal reinforcement layers, inducing secondary damage modes (such as stiffener debonding and delamination) along the way, and generally being arrested at the second set of longitudinal stiffeners. Damage redirection by the first set of longitudinal stiffeners was seen in one cylinder that had significant reinforcement in the longitudinal direction. The longitudinal stiffeners are, therefore, not as effective as the hoop stiffeners in inducing damage redirection in the laboratory-scaled specimens tested. The difference in the stiffener curvature and the presence of significant bending due to the flapping phenomenon caused by internal pressure during rupture contribute to this observed phenomenon. Since failure pressure of a laboratory-scaled specimen can be one order of magnitude higher than that of a full-scale structure, different damage propagation and arrest are expected in a full-scale structure.
Effects of longitudinal and hoop stiffeners on damage propagation in pressurized composite cylinders
An experimental study was conducted on the combined effects of longitudinal and hoop stiffening bands on the damage propagation in pressurized composite cylindrical shells. Damage was simulated as through-thickness longitudinal slits. Two different stiffener configurations were studied: 1) alternating continuous and broken hoop and longitudinal stiffeners (type A) and 2) continuous longitudinal and hoop fabric stiffeners (type B). In all but one cylinder, damage turned 90 deg near the edge of the hoop stiffening bands. In cases in which damage turned, it continued its propagation in the hoop direction, breaking the first set of longitudinal reinforcement layers, inducing secondary damage modes (such as stiffener debonding and delamination) along the way, and generally being arrested at the second set of longitudinal stiffeners. Damage redirection by the first set of longitudinal stiffeners was seen in one cylinder that had significant reinforcement in the longitudinal direction. The longitudinal stiffeners are, therefore, not as effective as the hoop stiffeners in inducing damage redirection in the laboratory-scaled specimens tested. The difference in the stiffener curvature and the presence of significant bending due to the flapping phenomenon caused by internal pressure during rupture contribute to this observed phenomenon. Since failure pressure of a laboratory-scaled specimen can be one order of magnitude higher than that of a full-scale structure, different damage propagation and arrest are expected in a full-scale structure.
Effects of longitudinal and hoop stiffeners on damage propagation in pressurized composite cylinders
Auswirkunge von Ring- und Längsversteifungen auf den Schadensfortschritt in innendruckbeanspruchten Verbundstoff-Zylindern
Budiman, H.T. (author) / Henault, K.F. (author) / Lagace, P.A. (author)
AIAA Journal ; 35 ; 145-151
1997
7 Seiten, 11 Bilder, 4 Tabellen, 23 Quellen
Article (Journal)
English
Zylinderschale , Zylinder (Körper) , Carbonfaser , Epoxidharz , Druckbeanspruchung , Versteifung , Längsrichtung , Umfang , Reifen (Ring) , Innendruck , Vergleichsmessung , Stickstoff , Schadensakkumulation , Nut , Stoff (Textil) , Aufblättern (Schicht) , Krümmung , Biegebeanspruchung , Bruchmechanik , Steifigkeit , Druckmessung , Bruchverlauf
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