Abstract: A system for stiffener integration in an isogrid structure. The modified isogrid structure comprises an isogrid panel; and at least one added stiffener attached to the isogrid panel. The added stiffener can be attached by welding, gluing, or bolting the stiffener to the isogrid panel. The modified isogrid panel has a pad-up in place of one of the ribs of the triangular pockets, wherein the added stiffener is affixed to the pad-up.

Abstract: An aircraft engine pylon includes two side panels and an upper stringer and a lower stringer assembled to form a strut assembly extending in a longitudinal direction (AX) corresponding to the direction in which the aircraft is moving and an internal reinforcement structure including a plurality of reinforcements. The pylon also includes a reinforcement zone on each side panel and a front housing to receive a main front center reinforcement and a rear housing to receive a main rear center reinforcement.

Abstract: A method for dimensioning of panels stiffened by triangular pockets that make it possible to take into account aeronautical specifics and more particularly the stresses that are admissible for the different types of buckling and the calculations of adapted reserve factors is presented. The method relates to dimensioning of a substantially plane panel of homogeneous and isotropic material by an analytical procedure, wherein the panel is composed of a skin reinforced by an assembly of three parallel bundles of stiffeners integrated with the panel, and triangular pockets defined on the skin, the stiffeners are strip-shaped and the panel must satisfy a specification of mechanical resistance to predetermined external loads, including steps organized in such a way that they can be repeated iteratively for different values of input data until reserve factors are obtained to determine the dimensions and arrangement of the panel elements necessary to obtain the imposed mechanical resistance.

Abstract: The invention relates to a method for dimensioning, by an analytical method, of an essentially plane panel consisting of a homogenous and isotropic material, said panel consisting of a skin reinforced by a set of three parallel bundles of stiffeners built into the panel. The pockets determined on the skin by said groups of stiffeners are triangular, the stiffeners are blade shaped and the stiffened panel must comply with specifications for mechanical resistance to predetermined external loads, the angles between bundles of stiffeners being such that the triangular pockets have any kind of isosceles form.

Abstract: An aircraft engine pylon includes two side panels and an upper stringer and a lower stringer assembled to form a strut assembly extending in a longitudinal direction (AX) corresponding to the direction in which the aircraft is moving and an internal reinforcement structure including a plurality of reinforcements. The pylon also includes a reinforcement zone on each side panel and a front housing to receive a main front centre reinforcement and a rear housing to receive a main rear centre reinforcement.

Abstract: A stiffened structure includes stiffeners (14.1, 14.2, 14.3) and nodes (12) at which three stiffeners (14.1, 14.2, 14.3) of different directions intersect, with the surfaces of the stiffeners (14.1, 14.2, 14.3) being arranged in planes that are perpendicular to the same plane, whereby the stiffened structure includes at least one opening (26) and is characterized in that the opening (26) is surrounded by a hexagonal belt, formed by peripheral stiffeners (40).

Abstract: The invention relates to a method for dimensioning, by an analytical method, of an essentially plane panel consisting of a homogenous and isotropic material, said panel consisting of a skin reinforced by a set of three parallel bundles of stiffeners built into the panel. The pockets determined on the skin by said groups of stiffeners are triangular, the stiffeners are blade shaped and the stiffened panel must comply with specifications for mechanical resistance to predetermined external loads, the angles between bundles of stiffeners being such that the triangular pockets have any kind of isosceles form.

Abstract: A stiffened structure includes stiffeners (14.1, 14.2, 14.3) and nodes (12) at which three stiffeners (14.1, 14.2, 14.3) of different directions intersect, with the surfaces of the stiffeners (14.1, 14.2, 14.3) being arranged in planes that are perpendicular to the same plane, whereby the stiffened structure includes at least one opening (26) and is characterized in that the opening (26) is surrounded by a hexagonal belt, formed by peripheral stiffeners (40).