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The Structural and Mechanical Basis for Passive‐Hydraulic Pine Cone Actuation

Eger, Carmen J. ; Horstmann, Martin ; Poppinga, Simon ; Sachse, Renate ; Thierer, Rebecca ; Nestle, Nikolaus ; Bruchmann, Bernd ; Speck, Thomas ; Bischoff, Manfred ; Rühe, Jürgen (2022):
The Structural and Mechanical Basis for Passive‐Hydraulic Pine Cone Actuation. (Publisher's Version)
In: Advanced Science, 9 (20), Wiley-VCH, e-ISSN 2198-3844,
DOI: 10.26083/tuprints-00022438,

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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: The Structural and Mechanical Basis for Passive‐Hydraulic Pine Cone Actuation
Language: English

The opening and closing of pine cones is based on the hygroscopic behavior of the individual seed scales around the cone axis, which bend passively in response to changes in environmental humidity. Although prior studies suggest a bilayer architecture consisting of lower actuating (swellable) sclereid and upper restrictive (non‐ or lesser swellable) sclerenchymatous fiber tissue layers to be the structural basis of this behavior, the exact mechanism of how humidity changes are translated into global movement are still unclear. Here, the mechanical and hydraulic properties of each structural component of the scale are investigated to get a holistic picture of their functional interplay. Measurements of the wetting behavior, water uptake, and mechanical measurements are used to analyze the influence of hydration on the different tissues of the cone scales. Furthermore, their dimensional changes during actuation are measured by comparative micro‐computed tomography (µ‐CT) investigations of dry and wet scales, which are corroborated and extended by 3D‐digital image correlation‐based displacement and strain analyses, biomechanical testing of actuation force, and finite element simulations. Altogether, a model allowing a detailed mechanistic understanding of pine cone actuation is developed, which is a prime concept generator for the development of biomimetic hygromorphic systems.

Journal or Publication Title: Advanced Science
Volume of the journal: 9
Issue Number: 20
Place of Publication: Darmstadt
Publisher: Wiley-VCH
Collation: 16 Seiten
Uncontrolled Keywords: µ‐CT scans, finite element simulation, hydration measurement, kinematical and structural analysis, model for water absorption, pine cone movement, tissue mechanics
Classification DDC: 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften, Biologie
500 Naturwissenschaften und Mathematik > 580 Pflanzen (Botanik)
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau
Divisions: 10 Department of Biology > Botanischer Garten
Date Deposited: 07 Oct 2022 13:21
Last Modified: 11 Oct 2022 09:26
DOI: 10.26083/tuprints-00022438
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-224383
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22438
PPN: 500225958
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