TU BRAUNSCHWEIG

Light-weight structures

Light-weight structures used optimally are a critical prerequisite for very good flight performance so that the take-off and landing distances as well as fuel consumption can be reduced. Both for parts of the wing and the fuselage, extremely light weight design can be achieved by using sandwich construction. Hybrid constructions should be included here, for example, where a fiber construction sandwich has a metal cover layer or an additional metal skin. Hybrid constructions are also attractive in load application and load redirection areas as well as shell joints.

Bonding methods and surface treatments are being developed that ensure an application of force in the bond and thereby guarantee almost complete utilization of the material. Additionally, new adhesives and methods of bonding and debonding provide for easy-to-disassemble and detachable joints, allowing for more efficient and economical maintenance activities.

In addition, the areas of application of force will be analyzed, particularly the bolted and riveted connections for sandwich structures. The goal of the work is to model the damage behavior of various structural concepts, including the detachable joints, and then to apply these models in the simulation of the respective component behavior and validate them with experiments.

The initial work includes the definition of a demonstrator component as well as the selection and pre-dimensioning of the material and joining method used. An innovative fundamental concept was developed for a multi-layer fuselage shell, with an inner skin of carbon-fiber reinforced plastic, a foam core, and a metal outer skin. It is currently being designed out mathematically. In the area of joining and process technology, various investigations are taking place into the feasibility of different ways of releasing structural bonds.


  last changed 21.12.2011
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