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Article

3D Reticulated Actuator Inspired by Plant Up-Righting Movement Through a Cortical Fiber Network

by 1,2,*, 1,3 and 1,2,3
1
Plant Biomechanics Group @ Botanic Garden Freiburg, University of Freiburg, Schänzlestraße 1, D-79104 Freiburg, Germany
2
Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Straße 21, D-79104 Freiburg, Germany
3
Cluster of Excellence livMatS @ FIT—Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, D-79110 Freiburg, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Matt McHenry
Biomimetics 2021, 6(2), 33; https://doi.org/10.3390/biomimetics6020033
Received: 26 April 2021 / Revised: 18 May 2021 / Accepted: 21 May 2021 / Published: 27 May 2021
Since most plant movements take place through an interplay of elastic deformation and strengthening tissues, they are thus ideal concept generators for biomimetic hingeless actuators. In the framework of a biomimetic biology push process, we present the transfer of the functional movement principles of hollow tubular geometries that are surrounded by a net-like structure. Our plant models are the recent genera Ochroma (balsa) and Carica (papaya) as well as the fossil seed fern Lyginopteris oldhamia, which hold a net of macroscopic fiber structures enveloping the whole trunk. Asymmetries in these fiber nets, which are specifically caused by asymmetric growth of the secondary wood, enable the up-righting of inclined Ochroma and Carica stems. In a tubular net-like structure, the fiber angles play a crucial role in stress–strain relationships. When braided tubes are subjected to internal pressure, they become shorter and thicker if the fiber angle is greater than 54.7°. However, if the fiber angle is less than 54.7°, they become longer and thinner. In this article, we use straightforward functional demonstrators to show how insights into functional principles from living nature can be transferred into plant-inspired actuators with linear or asymmetric deformation. View Full-Text
Keywords: actuator; bark; biomimetics; curving demonstrators actuator; bark; biomimetics; curving demonstrators
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MDPI and ACS Style

Masselter, T.; Speck, O.; Speck, T. 3D Reticulated Actuator Inspired by Plant Up-Righting Movement Through a Cortical Fiber Network. Biomimetics 2021, 6, 33. https://doi.org/10.3390/biomimetics6020033

AMA Style

Masselter T, Speck O, Speck T. 3D Reticulated Actuator Inspired by Plant Up-Righting Movement Through a Cortical Fiber Network. Biomimetics. 2021; 6(2):33. https://doi.org/10.3390/biomimetics6020033

Chicago/Turabian Style

Masselter, Tom, Olga Speck, and Thomas Speck. 2021. "3D Reticulated Actuator Inspired by Plant Up-Righting Movement Through a Cortical Fiber Network" Biomimetics 6, no. 2: 33. https://doi.org/10.3390/biomimetics6020033

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