Abstract: Method for manufacturing a stiffened panel of composite materials and a stiffened panel, comprising: a skin (1), and stiffeners (3, 4), wherein the manufacturing method comprises the following steps: providing a skin (1), making a plurality of through drill holes (6) on the skin (1) located in correspondence with areas where the placement of stiffeners (3, 4) is expected, introducing threaded bolts (5) in the through drill holes (6) such that the head (11) of the threaded bolt (5) remains housed in the skin (1), locating a threaded nut (10) on the free end of the threaded bolts (5), manufacturing the stiffeners (3, 4) such that the threaded bolts (5) and the threaded nut (10) remain embedded in the stiffeners (3, 4).

Abstract: Leaf spring comprising at least one leaf of composite material that comprises: a central body (1), and two eyes (2), wherein the central body (1) comprises its longitudinal end zones (1.1) embedded in a cavity (2.1) of the eyes (2), wherein the sections transversal to the longitudinal direction of the central body (1) of the longitudinal end zones (1.1) of the central body (1) and the cavities (2.1) of the eyes (2) present increasing dimensions towards the longitudinal end of the leaf spring and that comprises fibre fabrics (7, 8, 9) of the central body (1) stacked in a Z-direction perpendicular to the longitudinal direction of the central body (1) and to the longitudinal direction of the hole (3) of the eyes (2) and comprises fibre fabrics (10, 11) of the eyes (2) stacked in a parallel direction to the longitudinal direction of the longitudinal axis of the hole (3).