• Mahrholz, Thorsten
• Geier, Sebastian
• Kintscher, Markus
• Monner, Hans Peter
• Wiedemann, Martin
• Wierach, Peter

Abstract

Former research on morphing droop-nose applications revealed great economical and social ecological advantagesin terms of providing gapless surfaces for long areas of laminar flow. Furthermore a droop-nose for laminar flowapplications provides a low noise exposing high-lift system at the leading-edge. Various kinematic concepts forthe active deployment of such devices are already published but the major challenge is still an open issue: a skinmaterial which meets the compromise of needed stiffness and flexibility. Moreover additional functions have tobe added to keep up with standard systems. As a result of several national and European projects the DLRdeveloped a gapless 3D smart droop-nose concept, which was successfully analyzed in a low speed wind tunneltest under relevant loads to prove the functionality and efficiency. The main structure of this concept is made ofcommercial available glass fiber reinforced plastics (GRFP). This paper presents elementary tests to characterizematerial lay-ups and their integrity by applying different loads under extreme thermal conditions using agedspecimens. On the one hand the presented work is focused on the integrity of material-interfaces and on theother hand the efficiency and feasibility of embedded functions. It can be concluded that different preparations,different adhesives and used materials have their significant influence to the interface stability and mechanicalproperty of the whole lay-up. Especially the laminate design can be optimized due to the e. g. mechanicalexploitation of the added systems beyond their main function in order to reduce structural mass.

Topics

• impedance spectroscopy
• surface
• polymer
• glass
• glass
• ultraviolet photoelectron spectroscopy