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Mechanical and Structural Properties of Eastern Nigeria Tortoise Shell

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Mechanical and Structural Properties of Eastern Nigeria Tortoise Shell


Damian Okechukwu Okongwu | Sylvester Emeka Abonyi | Anthony Amaechi Okafor



Damian Okechukwu Okongwu | Sylvester Emeka Abonyi | Anthony Amaechi Okafor "Mechanical and Structural Properties of Eastern Nigeria Tortoise Shell" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-3, April 2022, pp.678-686, URL: https://www.ijtsrd.com/papers/ijtsrd49532.pdf

Macro-structural and mechanical properties of tortoise shells of Nigeria indigenous specie were studied to reveal its evolution as a natural load-bearing protective amour. The shell is revealed in this study to be a natural sandwich composite made of keratin, dorsal cortex, porous bone and ventral cortex. Indications of delamination which help the tortoise to absorb shocks were seen in the keratin. The dorsal and ventral cortexes were seen to be load bearing members with distribution of fibers in a manner that sustain dead load. The porosity seen in the middle porous layer ensures that the carapace is not too heavy for the tortoise to carry thus guarantees ease of locomotion, strength and damping. The average porosity of the studied shells is determined to be 31.0425% which as expected is smaller than the value 48.9% reported for porosity of shell of the turtle Terrapene Carolina in literature. The suture of the shell is revealed to house a zigzag interlocking design that allow slight deformation of the shell under light loads required for respiration, locomotion and metabolism but stiffen under excessive deformation. Stiffness of two specimens was determined to be and for the shells with masses 0.2362 kg and 0.2764Kg respectively. These stiffness values were as expected higher the typical values for those of turtles. The stiffness to mass ratio(k/m) for the two shells were respectively calculated to be and . The conditions established for equivalent synthetic shells to have less stiffness to mass ratio were and respectively. These conditions were shown not to be because of problems of stress concentration and weakness at the joints and delamination of the biological shells.

Tortoise Shell, metabolism, deformation, Stiffness


IJTSRD49532
Volume-6 | Issue-3, April 2022
678-686
IJTSRD | www.ijtsrd.com | E-ISSN 2456-6470
Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0)

International Journal of Trend in Scientific Research and Development - IJTSRD having online ISSN 2456-6470. IJTSRD is a leading Open Access, Peer-Reviewed International Journal which provides rapid publication of your research articles and aims to promote the theory and practice along with knowledge sharing between researchers, developers, engineers, students, and practitioners working in and around the world in many areas like Sciences, Technology, Innovation, Engineering, Agriculture, Management and many more and it is recommended by all Universities, review articles and short communications in all subjects. IJTSRD running an International Journal who are proving quality publication of peer reviewed and refereed international journals from diverse fields that emphasizes new research, development and their applications. IJTSRD provides an online access to exchange your research work, technical notes & surveying results among professionals throughout the world in e-journals. IJTSRD is a fastest growing and dynamic professional organization. The aim of this organization is to provide access not only to world class research resources, but through its professionals aim to bring in a significant transformation in the real of open access journals and online publishing.

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