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  Topological interlocking and geometric stiffening as complementary strategies for strong plant shells

Huss, J. C., Antreich, S. J., Bachmayr, J., Xiao, N., Eder, M., Konnerth, J., et al. (2020). Topological interlocking and geometric stiffening as complementary strategies for strong plant shells. Advanced Materials, 32(48): 2004519. doi:10.1002/adma.202004519.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-48BB-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-7E8C-F
Genre: Journal Article

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 Creators:
Huss, Jessica C.1, Author              
Antreich, Sebastian J., Author
Bachmayr, Jakob, Author
Xiao, Nannan, Author
Eder, Michaela1, Author              
Konnerth, Johannes, Author
Gierlinger, Notburga, Author
Affiliations:
1Michaela Eder, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863293              

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Free keywords: 3D imaging, pericarp, synzoochory, testa, tissue and shell mechanics
 Abstract: Abstract Many organisms encapsulate their embryos in hard, protective shells. While birds and reptiles largely rely on mineralized shells, plants often develop highly robust lignocellulosic shells. Despite the abundance of hard plant shells, particularly nutshells, it remains unclear which fundamental properties drive their mechanical stability. This multiscale analysis of six prominent (nut)shells (pine, pistachio, walnut, pecan, hazelnut, and macadamia) reveals geometric and structural strengthening mechanisms on the cellular and macroscopic length scales. The strongest tissues, found in walnut and pistachio, exploit the topological interlocking of 3D-puzzle cells and thereby outperform the fiber-reinforced structure of macadamia under tensile and compressive loading. On the macroscopic scale, strengthening occurs via an increased shell thickness, spherical shape, small size, and a lack of extended sutures. These functional interrelations suggest that simple geometric modifications are a powerful and resource-efficient strategy for plants to enhance the fracture resistance of entire shells and their tissues. Understanding the interplay between structure, geometry, and mechanics in hard plant shells provides new perspectives on the evolutionary diversification of hard seed coats, as well as insights for nutshell-based material applications.

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Language(s): eng - English
 Dates: 2020-10-202020
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/adma.202004519
BibTex Citekey: doi:10.1002/adma.202004519
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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 32 (48) Sequence Number: 2004519 Start / End Page: - Identifier: ISSN: 0935-9648