Sea Urchin Spines as a Model-System for Permeable, Light-Weight Ceramics with Graceful Failure Behavior. Part I. Mechanical Behavior of Sea Urchin Spines under Compression

The spines of pencil and lance urchins Heterocentrotus mammillatus and Phyllacanthus imperialis were studied as a model of light-weight material with high impact resistance. The complex and variable skeleton construction (“stereom”) of body and spines of sea urchins consists of highly porous Mg-bear...

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Bibliographic Details
Published in:Journal of bionics engineering 2009-09, Vol.6 (3), p.203-213
Main Authors: Presser, V., Schultheiß, S., Berthold, C., Nickel, K.G.
Format: Article
Language:English
Subjects:
Artificial Intelligence
Biochemical Engineering
Bioinformatics
Biomaterials
Biomedical Engineering and Bioengineering
Biomedical Engineering/Biotechnology
biomimetic
calcite
compression
Echinoidea
Engineering
mechanical behavior
Phyllacanthus imperialis
sea urchin spines
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Summary:The spines of pencil and lance urchins Heterocentrotus mammillatus and Phyllacanthus imperialis were studied as a model of light-weight material with high impact resistance. The complex and variable skeleton construction (“stereom”) of body and spines of sea urchins consists of highly porous Mg-bearing calcium carbonate. This basically brittle material with pronounced single-crystal cleavage does not fracture by spontaneous catastrophic device failure but by graceful failure over the range of tens of millimeter of bulk compression instead. This was observed in bulk compression tests and blunt indentation experiments on regular, infiltrated and latex coated sea urchin spine segments. Microstructural characterization was carried out using X-ray computer tomography, optical and scanning electron microscopy. The behavior is interpreted to result from the hierarchic structure of sea urchin spines from the macroscale down to the nanoscale. Guidelines derived from this study see ceramics with layered porosity as a possible biomimetic construction for appropriate applications.
ISSN:1672-6529
2543-2141
DOI:10.1016/S1672-6529(08)60125-0