A method for manufacturing an alveolar core structure includes at least one cell including a secondary duct having a first end defining a sound wave inlet, and an opposite second end, the secondary duct comprising a sound wave outlet. The method also includes a fastening step in which adhesive tapes transverse to the longitudinal direction of said first plate are applied on a first longitudinal plate. The secondary duct in the form of a flattened element is fastened, on the first plate, by gluing at its sound wave inlet. A second plate is applied. A step of deploying the first and second plates so as to form the peripheral wall of the cells and so that the flattened element is deployed.

A web. The web includes an array of discrete polymeric tubes, wherein the cross-section of each polymeric tube has a non-circular shape; wherein adjacent polymeric tubes has a bond region; wherein polymeric tubes are hollow polymeric tubes; wherein adjacent polymeric tubes are connected at bond regions; and wherein the web is a continuous web.

A composite component (16) for a vehicle (10) includes a laminate (18) made from a composite material, a first pad-up area (22) applied to the laminate (18), where the first pad-up area (22) includes a plurality of first tows laid next to one another in a side-by-side arrangement and where the first pad-up area (22) defines a first fiber orientation, and a second pad-up area (24), where the second pad-up area (24) includes a plurality of second tows laid next to one another in a side-by-side arrangement and where the second pad-up area (24) defines a second fiber orientation that differs by a predetermined angle from the first fiber orientation. The first pad-up area (22) and the second pad-up area (22) intersect at an intersecting area and together form a first pad-up ply on the laminate (18).

A method of manufacturing an acoustic treatment panel including at least one cellular structure with at least one anchor layer at the level of at least one of its faces. The anchor layer includes at least one adhesive sheet chosen from an adhesive film or a ply of pre-impregnated adhesive fibers in contact with the cellular structure. The method of manufacture includes, before the integration of the cellular structure in an acoustic treatment panel, a step of placing the anchor layer on a support, the adhesive sheet being the last to be placed, a step of placing the cellular structure on the anchor layer in contact against the adhesive sheet, and then a step of polymerization of the anchor layer and of the cellular structure.

A method for manufacturing a sound absorption structure comprising a cellular panel, a porous layer positioned on a cellular panel first face, a reflective layer positioned on a cellular panel second face and a plurality of acoustic elements positioned in the cellular panel. The method comprises the steps of producing, for each acoustic element, a recess in the cellular panel opening out onto the first and second faces of the cellular panel, inserting the acoustic elements into their recesses, laying an anchoring layer on the second cellular panel face, curing or polymerization at a first pressure to connect each acoustic element to the cellular panel and/or to the anchoring layer, putting in place the porous layer and the reflective layer, and curing or polymerization at a second pressure to connect the porous layer and the reflective layer to the cellular panel.

A system for producing a multiple layer material (49), comprising first and second corrugation rolls (14, 15) for providing a corrugated profile (16) having a plurality of crests (47), wherein the system further comprises first and second press rolls (21, 22) for applying a material sheet (19, 20) to crests (47) of the corrugated profile (16), and a plurality of heating members (28) arranged between the press rolls (21, 22) for welding the material sheet (19, 20) to the crests (47) of the corrugated profile (16) to form the multiple layer material (49). A guiding plate (48) is arranged between the corrugation 10 rolls (14, 15) and the heating members (28). The guiding plate (16) is arranged with a profile engaging side (50) having a plurality of crests (52) corresponding to the crests (47) of the corrugated profile (16). A cooling arrangement is provided for cooling the guiding plate (48). A method for producing the multiple layer material (49) is also disclosed.

A hierarchical sandwich core and a method of making it where a macroscopic honeycomb with a first macroscopic cell with first sandwich cell walls is connected to neighbouring macroscopic cells with neighbouring sandwich cell walls. The first and neighbouring sandwich cell walls are made of a sandwich material having a width, a mesoscopic core, and a first skin layer on a first major surface and a second skin layer on a second major surface of the sandwich material, both skin layers being attached to the mesoscopic core forming each sandwich cell wall of the macroscopic honeycomb. The first and the neighbouring cell walls have a height determined by the width of the sandwich material, both skin layers of the first sandwich cell wall being connected to both skin layers of at least one neighbouring cell wall along the height of the first cell wall.

Core element for sandwich elements, wherein the core element has at least two hemisphere panels which are combined with one another, wherein each hemisphere panel has, between planar portions, and spaced apart from one another, uniform hemispherical elevations, wherein the two or in each case two hemisphere panels face one another by way of their elevations, wherein, with two or in each case two hemisphere panels combined with one another, the elevations of one hemisphere panel each bear with their apexes or apex surfaces against a planar portion of the other hemisphere panel, and wherein two hemisphere panels are connected to one another by virtue of the elevations being connected, in the region of their apexes or apex surfaces, to the planar portion of the other or another hemisphere panel against which they bear. Moreover, the invention also relates to the use of a core element and to a method for producing a core element.

A method for producing a torsion box for a structure of an airplane. The method includes providing a first component made of a fiber composite material, the first component has a first planar base having a first inner side and a first outer side, first stiffening elements on the first inner side forming a composite with the first base. A second component is provided of a fiber composite material and has a second planar base having a second inner side and a second outer side. Second stiffening elements are on the second inner side and form a composite with the second base. The method includes superimposing the first component and the second component such that the first stiffening elements lie, at least in some areas, on the second inner side and the second stiffening elements lie, at least in some areas, on the first inner side. The methods includes connecting the first stiffening elements to the second base and connecting the second stiffening elements to the first base.

A hierarchical sandwich core in the form of a honeycomb, i.e. having repetitive and periodic lattice materials. The sandwich core can be made up of a macroscopic honeycomb structure with sandwich cell walls having a mesoscopic cellular core. The longitudinal axis of cells of the mesoscopic honeycomb cell can be perpendicular to the longitudinal axis of the cells of the macroscopic honeycomb structure. Alternatively, if a foam core is used having mesoscopic cells the shape of the mesoscopic cells can be made during the foaming process so that they are elongate in a direction perpendicular to the longitudinal axis of the cells of the macroscopic honeycomb structure.