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Armadillo armor: mechanical testing and micro-structural evaluation.

Irene H Chen¹, James H Kiang, Victor Correa

¹Materials Science and Engineering Program, Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093, USA.

Journal of the Mechanical Behavior of Biomedical Materials

|May 14, 2011

Summary

This summary is machine-generated.

Armadillo armor, or osteoderm, features a tough keratin layer over mineralized bone-like tiles connected by collagen fibers. Failure occurs via fiber stretching, with hydrated conditions significantly reducing strength and toughness.

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Area of Science:

Biomaterials Science
Comparative Anatomy
Biomechanics

Background:

Armadillos possess unique osteoderm, a bony armor layer providing distinct mechanical properties.
The osteoderm comprises a keratinous outer layer and underlying mineralized tiles, similar to bone, connected by collagen fibers (Sharpey's fibers).

Purpose of the Study:

To investigate the mechanical properties and failure mechanisms of armadillo osteoderm.
To compare the structural and mechanical characteristics of armadillo shells with those of turtle shells.

Main Methods:

Analysis of the layered structure of the armadillo shell, including keratin and osteoderm tiles.
Mechanical testing, including tensile strength and toughness measurements of hydrated and non-hydrated osteoderm.
Punch testing to determine shear strength of individual tiles.

Main Results:

Highly mineralized osteoderm exhibited tensile strength of ~20 MPa and toughness of ~1.1 MJ/m3.
Hydrated osteoderm showed reduced tensile strength (~16 MPa) and toughness (~0.5 MJ/m3).
Tensile failure is attributed to Sharpey's fiber stretching and rupture; shear strength (~18 MPa) is comparable to tensile strength, suggesting deformation in hydrated fibers.

Conclusions:

Armadillo osteoderm exhibits remarkable toughness due to its layered structure and collagenous connections.
Hydration significantly impacts the mechanical performance of the osteoderm, primarily affecting the collagenous components.
The study provides insights into the biomechanics of natural armor and offers potential applications in biomimetic material design.