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Related Experiment Video

Updated: Jun 13, 2026

Fragility Assessment of Bovine Cortical Bone Using Scratch Tests

Fragility Assessment of Bovine Cortical Bone Using Scratch Tests

Published on: November 30, 2017

Failure mode transition in nacre and bone-like materials.

Reza Rabiei¹, Sacheen Bekah, Francois Barthelat

¹Department of Mechanical Engineering, McGill University, Montreal, Que., Canada.

Acta Biomaterialia

|April 21, 2010

Summary

Pearl oyster nacre is the toughest, exhibiting unique "stair-like" deformation bands under stress. This discovery offers insights into biomimetic material design and enhances understanding of natural material toughness.

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Area of Science:

Materials Science
Biomimetics
Mechanics of Materials

Background:

Mineralized biological materials like nacre and bone achieve high stiffness and toughness through staggered arrangements of hard components bonded by soft materials.
This hierarchical structure enables energy dissipation via inelastic deformation, a key mechanism in natural materials.
Nacre serves as a model for developing advanced biomimetic materials.

Purpose of the Study:

To compare the toughness of nacre from four different mollusk species.
To identify the optimal nacre type for biomimetic material development.
To investigate the deformation and fracture mechanisms in nacre under stress.

Main Methods:

Comparative toughness testing of nacre from four mollusk species.
In situ optical and atomic force microscopy to observe deformation and fracture.
Analytical and numerical modeling to understand failure mode transitions.

Main Results:

Nacre from the pearl oyster exhibited the highest toughness.
Unique "stair-like" deformation bands, forming a tree-like network, were observed under stress.
This contrasts with the previously documented "columnar" failure mode.
Models identified conditions for the transition between stair and columnar failure modes, related to inclusion overlap and local shear stress.

Conclusions:

The "stair" failure mode enhances non-linear deformation and energy dissipation, leading to superior toughness.
Pearl oyster nacre's unique microstructure and failure mechanism make it an excellent biomimetic model.
Similar toughening mechanisms may operate in bone, given its analogous microstructure.