초록 ▼

A composite base structure (70) and end fitting (26) are secured together by a composite joint to form a graphite-epoxy composite nacelle diagonal strut (20). The elongated base structure (70) has a wall (72) formed of a cured epoxy reinforced with layers of graphite fibers (100, 102, 104, 106) exte

A composite base structure (70) and end fitting (26) are secured together by a composite joint to form a graphite-epoxy composite nacelle diagonal strut (20). The elongated base structure (70) has a wall (72) formed of a cured epoxy reinforced with layers of graphite fibers (100, 102, 104, 106) extending in elongated and transverse directions. The layers of fibers in the elongated direction (100, 104) and transverse direction (102, 106) extend onto a large diameter end (52) of a conical end portion (46) of an end fitting (26) and terminate on the conical portion adjacent a small diameter end (60). The layers of the elongated and transverse fibers (100, 102, 104, 106) are interlayered with layers (110, 112, 114, 116, 118) of graphite fibers generally circumferentially wrapped on the conical portion (46), the layers on the conical portion being impregnated with the cured epoxy. At the small diameter end of the conical portion (46) a transverse shoulder (60) extends outwardly and the fibers on the conical portion abut the shoulder. A method of joining an end fitting (26) to a fiber reinforced base structure (70) includes forming an elongated base structure (70) by applying layers of elongated fibers (100, 104) in the elongated or axial direction and applying layers of fibers (102, 106) in a transverse direction on a removable mandrel (90). The layers of fibers in the elongated and transverse directions are extended onto large diameter end of a conical end portion of an end fitting of large diameter end (52). Layers (110, 112, 114, 116, 118) are circumferentially wrapped on the conical portion so as to be interlayered with the layers of elongated and transverse fibers, the fibers being impregnated with an epoxy, and the epoxy being cured. The mandrel (90) is removed after the epoxy is cured.

대표청구항 ▼

A base structure and end fitting having a strong joint in which the base structure and joining structures are made from fiber reinforced material, comprising: an elongated base structure having a wall formed of a cured epoxy reinforced with layers of fibers extending in an elongated direction and in

A base structure and end fitting having a strong joint in which the base structure and joining structures are made from fiber reinforced material, comprising: an elongated base structure having a wall formed of a cured epoxy reinforced with layers of fibers extending in an elongated direction and in a transverse direction; layers of said fibers in the elongated direction and transverse direction of said wall extending onto a large diameter end of a conical end portion of an end fitting and on the conical portion to terminate substantially adjacent a small diameter portion of the conical portion; layers of said elongated and transverse fibers being interlayered with layers of fibers generally circumferentially wrapped on said conical portion; tensile or pull apart forces applied axially to the end fitting being resisted by hoop tension in the circumferentially wrapped fibers; said layers on said conical portion being impregnated with a cured epoxy; and an annular transverse shoulder extends outwardly from adjacent a small diameter end of the conical portion; fibers on said conical portion abutting the shoulder, the shoulder being adapted to receive compression forces in the fibers.