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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.
In: Advanced Science, 2022, 9 (20)
doi: 10.26083/tuprints-00022438
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: The Structural and Mechanical Basis for Passive‐Hydraulic Pine Cone Actuation
Language: English
Date: 7 October 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Science
Volume of the journal: 9
Issue Number: 20
Collation: 16 Seiten
DOI: 10.26083/tuprints-00022438
Corresponding Links:
Origin: Secondary publication DeepGreen

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.

Uncontrolled Keywords: µ‐CT scans, finite element simulation, hydration measurement, kinematical and structural analysis, model for water absorption, pine cone movement, tissue mechanics
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-224383
Classification DDC: 500 Science and mathematics > 570 Life sciences, biology
500 Science and mathematics > 580 Plants (botany)
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 10 Department of Biology > Botanischer Garten
Date Deposited: 07 Oct 2022 13:21
Last Modified: 14 Nov 2023 19:05
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22438
PPN: 500225958
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