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Open AccessArticle

Development and Testing of Woven FRP Flexure Hinges for Pressure-Actuated Cellular Structures with Regard to Morphing Wing Applications

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Institute of Adaptronics and Function Integration, Technische Universität Braunschweig, Langer Kamp 6, 38106 Braunschweig, Germany
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Institute of Composite Structures and Adaptive Systems, German Aerospace Center, Lilienthalplatz 7, 38108 Braunschweig, Germany
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Institute of Textile Machinery and High Performance Material Technology, Technische Universität Dresden, 01062 Dresden, Germany
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Author to whom correspondence should be addressed.
Aerospace 2019, 6(11), 116; https://doi.org/10.3390/aerospace6110116
Received: 17 September 2019 / Revised: 11 October 2019 / Accepted: 16 October 2019 / Published: 23 October 2019
(This article belongs to the Special Issue Aeronautical Systems for Flow Control)
Shape-variable structures can change their geometry in a targeted way and thus adapt their outer shape to different operating conditions. The potential applications in aviation are manifold and far-reaching. The substitution of conventional flaps in high-lift systems or even the deformation of entire wing profiles is conceivable. All morphing approaches have to deal with the same challenge: A conflict between minimizing actuating forces on the one hand, and maximizing structural deflections and resistance to external forces on the other. A promising concept of shape variability to face this challenging conflict is found in biology. Pressure-actuated cellular structures (PACS) are based on the movement of nastic plants. Firstly, a brief review of the holistic design approach of PACS is presented. The aim of the following study is to investigate manufacturing possibilities for woven flexure hinges in closed cellular structures. Weaving trials are first performed on the material level and finally on a five-cell PACS cantilever. The overall feasibility of woven fiber reinforced plastics (FRP)-PACS is proven. However, the results show that the materials selection in the weaving process substantially influences the mechanical behavior of flexure hinges. Thus, the optimization of manufacturing parameters is a key factor for the realization of woven FRP-PACS. View Full-Text
Keywords: PACS; pressure-actuation; shape-variable structures; morphing flap; anisotropic flexure hinges; compliant mechanism; adaptive structures; biomimetic; 3D weaving PACS; pressure-actuation; shape-variable structures; morphing flap; anisotropic flexure hinges; compliant mechanism; adaptive structures; biomimetic; 3D weaving
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Meyer, P.; Boblenz, J.; Sennewald, C.; Vorhof, M.; Hühne, C.; Cherif, C.; Sinapius, M. Development and Testing of Woven FRP Flexure Hinges for Pressure-Actuated Cellular Structures with Regard to Morphing Wing Applications. Aerospace 2019, 6, 116.

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