Bending mechanics of the red-eared slider turtle carapace

Journal of the Mechanical Behavior of Biomedical Materials
Ben AchraiH Daniel Wagner

Abstract

The turtle shell is a natural shield that possesses complex hierarchical structure, giving rise to superior mechanical properties. The keratin-covered boney top (dorsal) part of the shell, termed carapace, is composed of rigid sandwich-like ribs made of a central foam-like interior flanked by two external cortices. The ribs are attached to one another in a 3-D interdigitated manner at soft unmineralized collagenous sutures. This unique structural combination promotes sophisticated mechanical response upon predator attacks. In the present study mechanical bending tests were performed to examine the static behavior of the red-eared slider turtle carapace, in different orientations and from various locations, as well as from whole-rib and sub-layer regions. In addition, the suture properties were evaluated as well and compared with those of the rib. A simplified classical analysis was used here to rationalize the experimental results of the whole rib viewed as a laminated composite. The measured strength (~300MPa) and bending modulus (~7-8.5GPa) of the rib were found to be of the same order of magnitude as the strength and modulus of the cortices. The theoretical prediction of the ribs' moduli, predicted in terms of the individual...Continue Reading

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Citations

May 29, 2014·Nature Communications·Benny Bar-OnYael Politi
Jun 5, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Ben Achrai, H Daniel Wagner
Sep 24, 2015·Acta Biomaterialia·Irene H ChenMarc A Meyers
Jul 31, 2018·Journal of Anatomy·C Tristan Stayton
Mar 2, 2019·Evolution; International Journal of Organic Evolution·C Tristan Stayton
Dec 12, 2019·Nature Communications·Matthew ConnorsLing Li
Mar 6, 2017·Journal of the Mechanical Behavior of Biomedical Materials·Bingbing An, H Daniel Wagner
Jul 17, 2019·Acta Biomaterialia·Edward AmpawWinston Soboyejo
Jul 19, 2021·Journal of Biomechanics·Bingbing AnDongsheng Zhang

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