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The structural and mechanical basis for passive-hydraulic pine cone actuation

Eger, Carmen ; Horstmann, Martin ; Poppinga, Simon ; Sachse, Renate ; Thierer, Rebeccca ; Nestle, Nico ; Bruchmann, Bernd ; Speck, Thomas ; Rühe, Jürgen (2022)
The structural and mechanical basis for passive-hydraulic pine cone actuation.
In: Advanced Science, 9 (20)
doi: 10.1002/advs.202200458
Article, Bibliographie

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Abstract

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.

Item Type: Article
Erschienen: 2022
Creators: Eger, Carmen ; Horstmann, Martin ; Poppinga, Simon ; Sachse, Renate ; Thierer, Rebeccca ; Nestle, Nico ; Bruchmann, Bernd ; Speck, Thomas ; Rühe, Jürgen
Type of entry: Bibliographie
Title: The structural and mechanical basis for passive-hydraulic pine cone actuation
Language: English
Date: 20 September 2022
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Science
Volume of the journal: 9
Issue Number: 20
DOI: 10.1002/advs.202200458
URL / URN: https://onlinelibrary.wiley.com/doi/full/10.1002/advs.202200...
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Abstract:

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, kinemati-cal and structural analysis, model for water absorption, pine cone move-ment, tissue mechanic
Additional Information:

Artikel-ID: 2200458

Divisions: 10 Department of Biology
10 Department of Biology > Botanischer Garten
Date Deposited: 21 Sep 2022 05:16
Last Modified: 03 Jul 2024 02:58
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