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Achrai, B., & Wagner, D. H. (2013). Micro-structure and mechanical properties of the turtle carapace as a biological composite shield. Acta Biomaterialia, (in press, accepted manuscript). 
Added by: Admin (06 Jan 2014 18:22:34 UTC)
Resource type: Journal Article
DOI: http://dx.doi.org/10.1016/j.actbio.2012.12.023,
BibTeX citation key: Achrai2013
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Categories: General
Keywords: Emydidae, Morphologie - morphology, Schildkröten - turtles + tortoises, Trachemys scripta
Creators: Achrai, Wagner
Collection: Acta Biomaterialia
Views: 18/692
Views index: 31%
Popularity index: 7.75%
Abstract     
Trachemys scripta elegans Turtle shell is a multi-scale bio-composite in which the components are arranged in various spatial patterns, leading to an unusually strong and durable structure. The keratin-coated dorsal shell, termed carapace, exhibits a flat-bone, sandwich-like, structure made of two exterior cortices enclosing a cancellous interior. This unique structure is designed by nature to protect the reptile from predator attacks by sustaining impact loads and dissipating energy. In the present study we attempt to correlate the micro-scale architecture with the mechanical properties of the carapace sub-regions of the red-eared slider turtle. The microscopic structural features were examined by scanning electron microscopy and micro-computed tomography. Nanoindentation tests were performed under dry and wet conditions on orthogonal anatomical planes to evaluate the elastic modulus and hardness of the various carapace sub-regions. The mineral content was measured as well in the different regions of the carapace. Consequently, we discuss the influence of hydration on the carapace sub-regions and the contribution of each sub-region to the overall mechanical resistance of the assemblage.
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