Please use this identifier to cite or link to this item: http://dx.doi.org/10.18419/opus-12345
Authors: Krüger, Friederike
Thierer, Rebecca
Tahouni, Yasaman
Sachse, Renate
Wood, Dylan
Menges, Achim
Bischoff, Manfred
Rühe, Jürgen
Title: Development of a material design space for 4D-printed bio-inspired hygroscopically actuated bilayer structures with unequal effective layer widths
Issue Date: 2021
metadata.ubs.publikation.typ: Zeitschriftenartikel
metadata.ubs.publikation.seiten: 15
metadata.ubs.publikation.source: Biomimetics 6 (2021), No. 58
URI: http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-123649
http://elib.uni-stuttgart.de/handle/11682/12364
http://dx.doi.org/10.18419/opus-12345
ISSN: 2313-7673
Abstract: (1) Significance of geometry for bio-inspired hygroscopically actuated bilayer structures is well studied and can be used to fine-tune curvatures in many existent material systems. We developed a material design space to find new material combinations that takes into account unequal effective widths of the layers, as commonly used in fused filament fabrication, and deflections under self-weight. (2) For this purpose, we adapted Timoshenko’s model for the curvature of bilayer strips and used an established hygromorphic 4D-printed bilayer system to validate its ability to predict curvatures in various experiments. (3) The combination of curvature evaluation with simple, linear beam deflection calculations leads to an analytical solution space to study influences of Young’s moduli, swelling strains and densities on deflection under self-weight and curvature under hygroscopic swelling. It shows that the choice of the ratio of Young’s moduli can be crucial for achieving a solution that is stable against production errors. (4) Under the assumption of linear material behavior, the presented development of a material design space allows selection or design of a suited material combination for application-specific, bio-inspired bilayer systems with unequal layer widths.
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