Abstract: A reinforced tubular structure comprising a metal tube and a cured composite tubular liner which increases the longitudinal stiffness of the tubular structure, the liner being adhesively bonded to the inner peripheral surface of the metal tube. The reinforced tubular structure is fabricated by forming a laminate of the composite material, wrapping it around a flexible mandrel, inserting the mandrel and wrapped laminate into the metal tube, and co-curing the laminate to the inner peripheral surface of the tube.

Abstract: A reinforced tubular structure comprising a metal tube and a cured composite tubular liner which increases the longitudinal stiffness of the tubular structure, the liner being adhesively bonded to the inner peripheral surface of the metal tube. The reinforced tubular structure is fabricated by forming a laminate of the composite material, wrapping it around a flexible mandrel, inserting the mandrel and wrapped laminate into the metal tube, and co-curing the laminate to the inner peripheral surface of the tube.

Abstract: A reinforced ceramic structure is provided utilizing a composite reinforcing member embedded in a ceramic casting. The reinforcing member is optimally unidirectional composite rope, preferably of graphite epoxy or silicon carbide. By virtue of the thermal expansion rate of the reinforcing member being substantially the same as the ceramic material, the reinforcement member remains integral with the ceramic casting material though subjected to thermal cycles and provides an increase in the tensile strength of ceramic casting heretofore unobtained.

Abstract: A composite structure is reinforced and assembled utilizing barbed quill fasteners. By using such fasteners, the structure can be formed while in a staged condition. This allows co-curing and bonding of the elements of the structure in a joined condition. Additionally, by virtue of the use of the barbed quills and their being strategically implanted in the structure, peel forces in the structural joint are minimized.

Abstract: A composite reinforcement member is provided for reinforcing composite structural joints. The reinforcement member is optimally a laminate of fiber composite sheets of uniform size and shape which are adhesively bonded together. By virtue of the shape of the laminate and arrangement of the sheets, the fibers substantially distribute a tension load to minimize peel forces on the structural joint.

Abstract: A composite structural joint is reinforced and assembled utilizing barbed quill fasteners. By using such fasteners, the structural joint can be formed while in a staged condition. This allows co-curing and bonding of the elements of the structure in a joined condition. Additionally, by virtue of the use of the barbed quills and their being strategically implanted in the structural joint, peel forces in the joint are minimized.