Abstract: A method for manufacturing curved composite material omega stringers, comprising: automatic tape laying-up in an ATL machine, an AFP machine or a FLU machine and automatic cutting of the contour, to achieve a straight preform with reinforcements; flat forming to obtain an omega shape on the straight preform to transform it into a straight omega shaped preform; and curve forming the straight omega shaped preform by placing it in a flexible tool comprising a longitudinally embedded stiff band and a laminate clamping arrangement, the laminate clamping arrangement being located in extreme positions of the flexible tool, the flexible tool being covered by a mechanical closing arrangement, such that a head of the straight omega shaped preform has reinforcements on both extremes, the reinforcements being held by the laminate clamping arrangement during the forming process, and afterwards the straight omega shaped preform is heated and transformed into a curved omega stringer.

Abstract: A method for manufacturing curved composite material omega stringers, comprising: automatic tape laying-up in an ATL machine, an AFP machine or a FLU machine and automatic cutting of the contour, to achieve a straight preform with reinforcements; flat forming to obtain an omega shape on the straight preform to transform it into a straight omega shaped preform; and curve forming the straight omega shaped preform by placing it in a flexible tool comprising a longitudinally embedded stiff band and a laminate clamping arrangement, the laminate clamping arrangement being located in extreme positions of the flexible tool, the flexible tool being covered by a mechanical closing arrangement, such that a head of the straight omega shaped preform has reinforcements on both extremes, the reinforcements being held by the laminate clamping arrangement during the forming process, and afterwards the straight omega shaped preform is heated and transformed into a curved omega stringer.

Abstract: A method for manufacturing a stiffened panel made from composite material comprising a skin and elongated reinforcing elements wherein some of the elongated reinforcing elements cross each other. The method comprises the steps of (a) laying up a flat laminate comprising stacked plies of composite layers for forming a structure comprising the elongated reinforcing elements of the panel, (b) cutting the flat laminate along intersection lines of planes defining the webs of two crossing reinforcing elements, (c) cutting in the flat laminate the outline of the elongated reinforcing elements, (d) forming the structure comprising the elongated reinforcing elements of the panel, (e) laying up plies of composite layers for forming the skin, and (f) curing the laid-up plies of the skin and the formed structure comprising the elongated reinforcing elements.

Abstract: A method for manufacturing a stiffened panel made from composite material comprising a skin and elongated reinforcing elements wherein some of the elongated reinforcing elements cross each other. The method comprises the steps of (a) laying up a flat laminate comprising stacked plies of composite layers for forming a structure comprising the elongated reinforcing elements of the panel, (b) cutting the flat laminate along intersection lines of planes defining the webs of two crossing reinforcing elements, (c) cutting in the flat laminate the outline of the elongated reinforcing elements, (d) forming the structure comprising the elongated reinforcing elements of the panel, (e) laying up plies of composite layers for forming the skin, and (f) curing the laid-up plies of the skin and the formed structure comprising the elongated reinforcing elements.