Abstract: The invention relates to a process for making a reinforced curved metallic structure, made from a heavy-gauge or plate-gauge sheet of an aluminium alloy containing scandium. The process consists in combining forming (200) and machining (300) steps, the forming step (200) giving the structure curvature(s) and the machining step (300) producing a network of ribs for reinforcing the structure. A finishing step (400) can complete the preceding steps. Such a process makes it possible to obtain a monobloc metallic structure with good mechanical properties simply and quickly. Application to the manufacture of a reinforced curved metallic structure of an aircraft subassembly.

Abstract: The invention relates to a structural frame made from a composite material. The purpose of the invention is to obtain a structural frame with high mechanical performances while remaining simple in construction. This purpose is achieved in arranging sets of single-directional fibres in the main part of the structural frame at a predetermined angle. This system may be used as a structural frame particularly for an aircraft fuselage.

Abstract: The subject of the disclosed embodiments is a method of optimizing stiffened panels under stress. In particular, the method makes it possible to determine the stress distribution in stiffened panels with postbuckling taken into account. The method proposed is a coupling between an overall, linear stress calculation approach, based on strength-of-materials results, and a local, nonlinear approach for the behavior of the stiffened panel. The disclosed embodiments fall within the field of aeronautical design, at the pilot study stage in the definition of a civil transport airplane of conventional architecture.

Abstract: A partition for an aircraft is designed to separate a cargo part from a cockpit or a passenger compartment of this aircraft. The partition includes a cellular central structure in contact with a first external wall and a second external wall of this partition. The partition also includes several stiffener elements added onto at least one of the first and second external walls. The invention also relates to an aircraft including at least one such partition.

Abstract: An aircraft includes a partition designed to separate a cargo part from a cockpit or a passenger compartment. The partition includes a corrugated structure, defining several corrugations with an approximately omega section extending along the direction of the height of the partition. The partition also includes one or several stiffener elements.

Abstract: The invention relates to a partition (2) for aircraft designed to separate a cargo part from a cockpit or a passenger compartment of this aircraft, this partition (2) comprising a corrugated structure (30), defining several corrugations (38) with an approximately omega section extending along the direction of the height of the partition, this partition also comprising one or several stiffener elements (60). The invention also relates to an aircraft comprising at least one such partition (2).

Abstract: The invention relates to a partition (2) for aircraft designed to separate a cargo part from a cockpit or a passenger compartment of this aircraft, the partition (2) comprising a cellular central structure (30) in contact with a first external wall (32) and a second external wall (34) of this partition. According to the invention, the partition (2) also comprises several stiffener elements (46) added onto at least one of the first and second external walls (32,34). The invention also relates to an aircraft comprising at least one such partition.

Abstract: Optimized method for assembling two substantially flat parts. To assemble two parts (10, 12) that are substantially flat using fixations (14) such as rivets or bolts, first the ratio R is calculated between tensile and bending stresses relating to the forces to be transmitted. The end line of the fixations (14) is then oriented along an angle &agr; whose absolute value is such that 10.8 ln(R)+16<|&agr;|<13.9 ln(R)+28 when the ratio R is 1 or more, and such that 16°<|&agr;|<28° when the ratio R is less than 1. The absolute value of angle &agr; does not exceed 90°.

Abstract: Optimised method for assemblling two substantially flat parts.

Abstract: Flaked additive composition for producing stock mixtures of polymers, containing magnesia, MgO, or hydrotalcite, calcium stearate, and N,N-bis(hydroxyethyl)-N-stearylamine, or equivalent compounds.