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Morphology and porosity of the spines of the sea urchin Heterocentrotus mamillatus and their implications on the mechanical performance

Lauer, Christoph and Grun, Tobias B. and Zutterkirch, Isabel and Jemmali, Raouf and Nebelsick, James H. and Nickel, Klaus G. (2017) Morphology and porosity of the spines of the sea urchin Heterocentrotus mamillatus and their implications on the mechanical performance. Zoomorphology (136). Springer. doi: 10.1007/s00435-017-0385-4. ISBN 1432-234X. ISSN 0720-213X.

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Official URL: https://link.springer.com/article/10.1007/s00435-017-0385-4

Abstract

Spines of the slate pencil sea urchin Heterocentrotus mamillatus Linnaeus, 1758, are in focus of biomimetic research as they feature a “graceful” failure behaviour under uniaxial compression dissipating energy and resisting high loads even after high strain. This study elucidates and quantifies the organization of calcitic trabeculae and pores in large primary spines of the slate pencil urchin H. mamillatus by image analysis from scanning electron microscopy, X-ray micro-computed tomography (µCT) and gravimetry. This study delivers a detailed distribution of porosities within the whole spine and shows that parts of the spines have a much higher porosity then hitherto thought. The central part (medulla) of the high-magnesium calcitic stereom of H. mamillatus spines has a porosity range of 75% to nearly 90%. From this innermost structure, more than 200 radially aligned, but often sinuous trabeculae extend to the spine rim. The structure of this complicated meshwork (radiating layer) is best seen in basal cross sections and was confirmed by µCT scans. The radiating layer has a porosity range from 40–70% and is irregularly separated by the dense growth layers (15–35% porosity). Growth layers were classified in proximal and distal growth layers with numbers ranging within a single animal between 3–14 and 2–7, respectively. These growth layers are characteristic for H. mamillatus spines and play a major role in their remarkable mechanical properties. The porosity of the spine increases from base to tip. Biological and mechanical implications of the variations are discussed.

Item URL in elib:https://elib.dlr.de/115063/
Document Type:Article
Title:Morphology and porosity of the spines of the sea urchin Heterocentrotus mamillatus and their implications on the mechanical performance
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lauer, Christophchristoph.lauer (at) uni-tuebingen.deUNSPECIFIED
Grun, Tobias B.UNSPECIFIEDUNSPECIFIED
Zutterkirch, IsabelUNSPECIFIEDUNSPECIFIED
Jemmali, RaoufRaouf.Jemmali (at) dlr.deUNSPECIFIED
Nebelsick, James H.UNSPECIFIEDUNSPECIFIED
Nickel, Klaus G.UNSPECIFIEDUNSPECIFIED
Date:4 November 2017
Journal or Publication Title:Zoomorphology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s00435-017-0385-4
Publisher:Springer
Series Name:Evolutionary, Comparative and Functional Morphology
ISSN:0720-213X
ISBN:1432-234X
Status:Published
Keywords:Morphology, Echinoids, Sea urchin spines, Porosity, µCT scans
HGF - Research field:Energy
HGF - Program:other
HGF - Program Themes:E - no assignment
DLR - Research area:Energy
DLR - Program:E - no assignment
DLR - Research theme (Project):E - no assignment
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design
Deposited By: Jemmali, Raouf
Deposited On:11 Dec 2017 11:50
Last Modified:08 Mar 2018 18:40

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