On Some Feature of Deformation Behavior of a Bird Eggshell

Authors

P. Panfilov ¹ , Maxim Mezhenov ² , Jinming Guo ³ , Dmitry Zaitsev ^1, ²

¹ Ural Federal University named after the First President of Russia B.N. Yeltsin, Mira str. 19, Yekaterinburg, 620002, Russia

² Ural State Mining University, Kuibyshev str. 30, Yekaterinburg, 620144, Russia

³ Hubei University, Wuhan, China

10.17586/2687-0568-2024-6-3-96-112

Rev. Adv. Mater. Technol., 2024, vol. 6, no. 3, pp. 96–112

Abstract

Behavior of bird eggshells—biominerals consisting of about 90% of calcium carbonate—under bending is examined. Eggs of several birds were used with two sets of samples cut from every bird eggshell. Mechanical testing was carried out on dry and wet samples in air. Cracks in eggshell samples under bending were studied in situ using a light microscope. Eggshell exhibits brittle behavior on the macroscopic scale in both dry and wet states. However, the crack width could be increased by increasing bending deflection similar to ductile metals under tension. Wet samples show lower bending strength. The morphology of cracks in an eggshell under bending is close to the crack in neck region of a flat aluminum sample. It may be concluded that a bird eggshell under bending exhibits some features of ductile fracture on the microscopic scale.

Keywords

Biomineral; Bird eggshell; Bending; Deformation; Fracture

Foundings

Russian Science Foundation: 23-29-00253

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Volume 6, No 3

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History

Receive Date: 16 July 2024

Accepted Date: 01 August 2024

Available online: 16 August 2024

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