Abstract: A process for placing elements of a self-stiffened panel of preimpregnated composite. The panel includes a base skin and a plurality of U-shaped stiffeners, with an interfacing structure including a nail and a nail-head. The process includes draping plies to form the base skin; placing and shaping at least one reinforcing ply on a set of punches; forming half-nails; placing a half-nail on the sides of each punch covered by the reinforcing ply; positioning the punches side by side in inverted U-positions; placing the nail-heads; compacting the set of punches; turning the punches 180 degrees; positioning the set of punches on the base skin; and withdrawing the set of U-shaped punches.

Abstract: A process for placing elements of a self-stiffened panel of preimpregnated composite. The panel includes a base skin and a plurality of U-shaped stiffeners, with an interfacing structure including a nail and a nail-head. The process includes draping plies to form the base skin; placing and shaping at least one reinforcing ply on a set of punches; forming half-nails; placing a half-nail on the sides of each punch covered by the reinforcing ply; positioning the punches side by side in inverted U-positions; placing the nail-heads; compacting the set of punches; turning the punches 180 degrees; positioning the set of punches on the base skin; and withdrawing the set of U-shaped punches.

Abstract: A tube for the circulation of a flammable fluid, adapted to be mounted in a structure, made at least partially of electrically insulating material, capable of being subjected to electrical disturbances of atmospheric origin. Tube (3) comprises two endpieces (5) for joining made of electrically conductive material and a body (6). Tube body (6), of which at least the inner surface is electrically conductive over the major part of its length, presents at least one electrically insulating section (10). The tube particularly applicable as fuel conduits for aircraft.