Method for manufacturing a composite preform for the manufacture of a composite panel with double curvature geometry

A manufacturing method for manufacturing a preform for the manufacture of a part made of a composite material of a revolution or quasi-revolution non-developable final shape type, having a longitudinal axis, the manufacturing method comprising:

• a) providing a tri-axial non-woven fabric comprising:
• a first layer comprising circumferential fibers oriented in a first direction,
• a second layer comprising fibers, oriented in a second direction,
• a third layer comprising fibers, oriented in a third direction, and
• seams binding the fibers of the first layer, the second layer and third layer, the seams extending parallel to each other and forming sheaths for the circumferential fibers,
• b) disposing the tri-axial non-woven fabric on or in a non-developable shape element, either identical to a non-developable final shape, or of reduced dimensions compared to the non-developable final shape, by placing the seams parallel to a circumferential direction of the non-developable shape element, and
• c) sliding the circumferential fibers in the sheaths formed by the seams, so that the tri-axial non-woven fabric is in continuous contact with the non-developable shape element and is adapted to a non-developable shape of the non-developable shape element to manufacture the preform.