Stiffening element carbon-glass layered foot section
View Patent ↗The present invention provides a stiffening element for stiffening a step-like substructure, in particular in an aircraft or spacecraft, having a foot section which is composed of a fiber composite material and is shaped in the form of a step such that it essentially fills the substructure. A method is also provided for production of a stiffening element for stiffening of a step-like substructure in an aircraft or spacecraft, according to which a profile part with a foot section which is composed of a carbon-fiber-reinforced plastic is provided, at least one layer of a glass-fiber-reinforced plastic is laminated onto the foot section, and the glass-fiber-reinforced plastic is milled corresponding to a step-like shape which essentially fills the substructure.
1. A stiffening element for stiffening a step-like substructure in an aircraft or spacecraft, the stiffening element having a foot section which comprises:
a carbon-fiber-reinforced plastic material;
a shape in the form of a step such that it essentially fills the adjacent portion of the substructure; and
at least one layer of machined glass-fiber-reinforced plastic material bonded on top of the carbon-fiber-reinforced plastic material and configured on that surface of the foot section which matches the shape of the substructure.
2. The stiffening element according to claim 1 , further comprising a boundary surface between the carbon-fiber-reinforced plastic and the at least one layer of glass-fiber-reinforced plastic, wherein the carbon-fiber-reinforced plastic comprises carbon fibers running parallel to the boundary surface, and the at least one layer of glass-fiber-reinforced plastic comprises glass fibers running parallel to the boundary surface.
3. The stiffening element according to claim 2 , wherein the carbon fibers and the glass fibers run parallel to the boundary surface and to each other.
4. The stiffening element according to claim 1 , wherein the at least one layer of glass-fiber-reinforced plastic has a step-like change in thickness along the foot section.
5. The stiffening element according to claim 4 , wherein some of the glass fibers in the at least one layer of the glass-fiber-reinforced plastic are cut off adjacent to the step-like change.
6. The stiffening element according to claim 1 , wherein the at least one layer of the glass-fiber-reinforced plastic has a maximum thickness of 1 mm to 20 mm along the foot section.
7. The stiffening element according to claim 6 , wherein the minimum thickness along the foot section is between 0.1 mm and 0.2 mm.
8. The stiffening element according to claim 1 , wherein the at least one layer of the glass-fiber-reinforced plastic has a minimum thickness of at least 0.1 mm along the foot section.